hd74ls240p八缓冲线驱动

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单片机教学系统驱动芯片测试装置的设计

单片机教学系统驱动芯片测试装置的设计高原;陈雅妮【摘要】针对DTHS-A单片机实验平台的日常维护需要设计了该测试装置,该装置能够快速的检测实验电路中驱动芯片是否正常,与传统方法相比,节约了维护的时间,提高了检测效率.该装置以STC15F2K61S2为控制核心,通过按键与拨码开关来选择对应芯片,通过液晶显示与LED指示芯片是否正常,同时具有过流保护功能.%The daily maintenance of DTHS-A MCU experimental platform requires a test device design, the device can detect the experimental circuit of the rapid drive chip is normal, compared with traditional methods, saving the maintenance time, improve the detection efficiency. The device usesSTC15F2K61S2 as the control core, selects the corresponding chip through the button and the dial switch, through the LCD display and the LED indicating whether the chip is normaland has the over-current protection function.【期刊名称】《电子测试》【年(卷),期】2017(000)020【总页数】2页(P20-21)【关键词】STC15F2K61S2;芯片检测【作者】高原;陈雅妮【作者单位】曲阜师范大学实验教学中心,山东日照,276826;山东信息职业技术学院,山东潍坊, 261000【正文语种】中文DTHS-A单片机实验教学平台在维护的过程中需要经常检测各数字驱动模块的工作状态，传统的方法只能是通过对应实验连线并下载程序观察实验现象是否正常，该测试方法存在着工作量大、故障定位不准确的缺点。

PSPice 元件库介绍

PSPice 元件库介绍1. AMPLIFIER.OLB共182个零件，存放模拟放大器IC，如CA3280，TL027C，EL4093等。

2. ARITHMETIC.OLB共182个零件，存放逻辑运算IC，如TC4032B，74LS85等。

3.ATOD.OLB共618个零件，存放A/D转换IC，如ADC0804，TC7109等。

4. BUS DRIVERTRANSCEIVER.OLB共632个零件，存放汇流排驱动IC，如74LS244，74LS373等数字IC。

5. CAPSYM.OLB共35个零件，存放电源，地，输入输出口，标题栏等。

6. CONNECTOR.OLB共816个零件，存放连接器，如4 HEADER，CON AT62，RCA JACK等。

7. COUNTER.OLB共182个零件，存放计数器IC，如74LS90，CD4040B。

8. DISCRETE.OLB共872个零件，存放分立式元件，如电阻，电容，电感，开关，变压器等常用零件。

9. DRAM.OLB共623个零件，存放动态存储器，如TMS44C256，MN-10等。

10. ELECTRO MECHANICAL.OLB共6个零件，存放马达，断路器等电机类元件。

11. FIFO.OLB共177个零件，存放先进先出资料暂存器，如，SN74LS232。

12. FILTRE.OLB共80个零件，存放滤波器类元件，如MAX270，LTC1065等。

13. FPGA.OLB存放可编程逻辑器件，如XC6216/LCC。

14. GATE.OLB共691个零件，存放逻辑门（含CMOS和TLL）。

15. LATCH.OLB共305个零件，存放锁存器，如4013，74LS73，74LS76等。

16. LINE DRIVER RECEIVER.OLB共380个零件，存放线控驱动与接收器。

如SN，DS275等。

17. MECHANICAL.OLB共110个零件，存放机构图件，如M HOLE 2，PGASOC-15-F等。

74ac241,74act241 八路缓冲线驱动器具有3-state输出说明书

74AC241, 74ACT241 Octal Buffer/Line Driver with 3-STATE Outputs74AC241, 74ACT241 Octal Buffer/Line Driver with 3-STATE OutputsTruth TableH = HIGH Voltage Level X = ImmaterialL = LOW Voltage LevelZ = High ImpedanceAbsolute Maximum RatingsStresses exceeding the absolute maximum ratings may damage the device. The device may not function or beoperable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.Recommended Operating ConditionsThe Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.Inputs OutputsInputs OutputsOE 1I nPins 12, 14, 16, 18OE 2I nPins 3, 5, 7, 9L L L H L L L H H H H H HXZLXZSymbol ParameterRatingV CC Supply Voltage –0.5V to +7.0VI IKDC Input Diode Current V I = –0.5V V I = V CC + 0.5V–20mA +20mAV I DC Input Voltage –0.5V to V CC + 0.5VI OKDC Output Diode Current V O = –0.5V V O = V CC + 0.5V–20mA +20mAV O DC Output Voltage–0.5V to V CC + 0.5VI O DC Output Source or Sink Current ±50mA I CC or I GND DC V CC or Ground Current per Output Pin±50mAT STG Storage Temperature –65°C to +150°CT JJunction Temperature140°CSymbol ParameterRatingV CCSupply Voltage AC ACT2.0V to 6.0V 4.5V to 5.5V V I Input Voltage 0V to V CC V O Output Voltage 0V to V CCT A Operating Temperature–40°C to +85°C∆ V / ∆ t Minimum Input Edge Rate, AC Devices:V IN from 30% to 70% of V CC , V CC @ 3.3V , 4.5V , 5.5V 125mV/ns ∆ V / ∆ tMinimum Input Edge Rate, ACT Devices: V IN from 0.8V to 2.0V , V CC@ 4.5V , 5.5V125mV/ns74AC241, 74ACT241 Octal Buffer/Line Driver with 3-STATE OutputsDC Electrical Characteristics for ACNotes:1.All outputs loaded; thresholds on input associated with output under test.2.Maximum test duration 2.0ms, one output loaded at a time.3.I IN and I CC @************************************************************** CC .SymbolParameterV CC (V)ConditionsT A = +25°CT A = –40°C to +85°C UnitsTyp.Guaranteed LimitsV IHMinimum HIGH Level Input Voltage3.0V OUT = 0.1V or V CC – 0.1V 1.5 2.12.1V4.5 2.25 3.15 3.155.5 2.75 3.85 3.85V ILMaximum LOW Level Input Voltage3.0V OUT = 0.1V or V CC – 0.1V 1.50.90.9V4.5 2.25 1.35 1.355.5 2.75 1.65 1.65V OHMinimum HIGHLevel Output Voltage3.0I OUT = –50µA2.99 2.9 2.9V 4.5 4.49 4.4 4.45.55.495.4 5.4V IN = V IL or V IH :3.0I OH = –12mA 2.56 2.464.5I OH = –24mA 3.86 3.765.5I OH = –24mA (1) 4.864.76V OLMaximum LOWLevel Output Voltage3.0I OUT = 50µA0.0020.10.1V 4.50.0010.10.15.50.0010.10.1V IN = V IL or V IH :3.0I OL = 12mA 0.360.444.5I OL = 24mA 0.360.445.5I OL = 24mA (1) 0.360.44I IN (3) Maximum Input Leakage Current 5.5V I = V CC , GND ±0.1±0.1µA IOZMaximum 3-STATE Leakage Current 5.5V I (OE) = V IL , V IH ; V I = V CC , GND; V O = V CC , GND ±0.25±2.5µA I OLD Minimum Dynamic Output Current (2) 5.5V OLD = 1.65V Max.75mA I OHD V OHD = 3.85V Min.–75mA I CC (3)Maximum Quiescent Supply Current5.5V IN = V CC or GND4.040.0µANotes:4.All outputs loaded; thresholds on input associated with output under test.5.Maximum test duration 2.0ms, one output loaded at a time.I CCMaximumQuiescent Supply Current5.5V IN = V CC or GND4.040.0µANote:7.Voltage range 5.0 is 5.0V ± 0.5V.CapacitanceData to Output t PHL Propagation Delay, Data to Output 5.0 1.57.09.0 1.510.0ns t PZH Output Enable Time 5.0 1.5 6.09.0 1.010.0ns t PZL Output Enable Time 5.0 1.57.010.0 1.511.0ns t PHZ Output Disable Time 5.0 1.58.010.5 1.511.5ns t PLZOutput Disable Time5.02.07.010.51.511.5nsSymbolParameterConditionsTyp.UnitsC IN Input CapacitanceV CC = OPEN 4.5pF C PDPower Dissipation CapacitanceV CC = 5.0V45.0pFPackage Number M20B74AC241, 74ACT241 Octal Buffer/Line Driver with 3-STATE Outputs The Power Franchise™TinyBoost。

芯片产品说明书：74LVC240A 八极缓冲器线路驱动器

DescriptionThe 74LVC240A provides two 4-bit buffers/drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.The device is designed for operation with a powersupply range of 1.65V to 3.6V.The inputs are tolerant to 5.5V allowing this device to be used in a mixed voltage environment. The device is fully specified for partial power down applications using I OFF . The I OFF circuitry disables the output preventing damaging current backflow when the device is powered down.Features∙ Supply Voltage Range from 1.65V to 3.6V ∙ Sinks or Sources 24 ma at V CC = 3V ∙ CMOS Low Power Consumption∙ I OFF Supports Partial -Power Down Operation∙ Inputs or Outputs Accept up to 5.5V∙ Inputs Can Be Driven by 3.3V or 5V Allowing for Mixed Voltage Applications∙ Schmitt Trigger Action at All Inputs∙ Typical V OLP (Quiet Output Ground Bounce) Less than 0.8V with V CC = 3.3V and T A = +25°C∙ Typical V OHV (Quiet Output dynamic VOH) Greater than 2.0V with V CC = 3.3V and T A = +25°C∙ESD Protection Tested per JESD 22▪ Exceeds 200-V Machine Model (A115)▪ Exceeds 2000-V Human Body Model (A114) ▪ Exceeds 1000-V Charged Device Model (C101) ∙ Latch-Up Exceeds 250mA per JESD 78, Class I ∙All devices are:▪ Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2) ▪ Halogen and Antimony Free.“Green” Device (Note 3)Pin Assignments(Top View )TSSOP-20Top Transparent View 3245678913141217181615191120110V c c2OE 1Y22A42A31Y32A21Y42A 11Y1G N D1O E1A22Y42Y31A32Y21A42Y11A1QFN-20()terminal 1 index areaApplications∙ General Purpose Logic ∙ Bus Driving∙ Power Down Signal Isolation ∙Wide Array of Products Such as:▪ PCs, Notebooks, Netbooks, Ultrabooks▪ Networking Computer Peripherals, Hard Drives, CD/DVDROM▪ TV, DVD, DVR, Set Top BoxNotes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.2. See /quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen a nd Antimony free, "Green" and Lead-Free.3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.Ordering InformationBuffer/Line Driver with 3 State OutputsQ20 : QFN-20Notes: 4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at/datasheets/ap02001.pdf.5. V-QFN4525-20 is a JEDEC recognized naming convention that specifies the package thickness category as V and the number 4525 describes the package as 4.5mm X 2.5mm.Pin DescriptionsLogic DiagramFunction TableAbsolute Maximum Ratings(Notes 6 & 7)Notes: 6. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be within recommend values.7. Forcing the maximum allowed voltage could cause a condition exceeding the maximum current or conversely forcing the maximum current couldcause a condition exceeding the maximum voltage. The ratings of both current and voltage must be maintained within the controlled range. Recommended Operating Conditions(Note 8)Note: 8. Unused inputs should be held at V CC or Ground.Operating CharacteristicsPackage CharacteristicsNote: 9. Test conditions for TSSOP-20 and V-QFN4525-20: Devices mounted on 4 layer FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout per JESD 51-7.Parameter Measurement InformationFrom Output Under TestV l0 VOutput Control/2Output Waveform 1S1 at V LOAD (see Note B) Output Waveform 2 S1 at GND (see Note B)Voltage Waveform Enable and Disable TimesLow and High Level EnablingVoltage Waveform Pulse DurationV l0 V V OHV OLV OHV OLVoltage Waveform Propagation Delay TimesInverting and Non Inverting OutputsNotes:A. Includes test lead and test apparatus capacitance.B. All pulses are supplied at pulse repetition rate ≤ 10 MHz.C. Inputs are measured separately one transition per measurement.D. t PLZ and t PHZ are the same as t dis.E. t PZL and t PZH are the same as t EN0F. t PLH and t PHL are the same as t PD.Figure 1 Load Circuit and Voltage WaveformsMarking Information (1) TSSOP20(2) QFN-20 (V-QFN4525-20)Package Outline Dimensions (All Dimensions in mm)Please see /package-outlines.html for the latest version.(1) TSSOP-20(2) QFN-20 (V-QFN4525-20)Suggested Pad LayoutPlease see /package-outlines.html for the latest version.(1) TSSOP-20(2) QFN-20 (V-QFN4525-20)X1。

54ls540,74ls540中文资料

0.8 -15 24 85
电性能：（除特别说明外，均为全温度范围）
最小 4.5 2.0
-55
54 参数值
典型 5
最大 5.5
0.7 -12 12 125
单位
V V V mA mA ℃
符号参数名称
测试条件
VIK 输入钳位电压 Vcc=最小 II=-18mA
VT+-VT- 滞后电压 Vcc=最小
Vcc=最小 VIL=最大
74Ⅱ 参数值最小典型最大
-1.5 0.2 0.4
2.4 3.1
2.0
0.35 0.5
0.1
20 -0.2
20
-20
-40
-225
25
45
52
54 参数值最小典型最大
-1.5 0.2 0.4
2.4 3.1
2.0
0.25 0.4
0.1
20 -0.2
20
-20
-40
-225
13 25
24 45
特点：
54LS540/74LS540 LSTTL 型八缓冲器/线驱动器（三态输出、反码）
逻辑图
·三态输出驱动总线或缓冲存贮器地址寄存器；
·PNP 输入减小直流负载； ·输入滞后电压改善噪声容限； ·数据流直通的外引脚排列（全部输
入端在输出端的对面）。
典型参数 tpd=10ns Pd=92.5mW
外引线排列图
tPLZ 传输延迟
tPHZ 传输延迟
Y CL=45pF RL=667Ω
Y CL=5pF RL=667Ω
最小
参数值典型
9 12 25 15 15 10
最大 15 15 38 25 25 18

MC74LCX240低压CMOS八路缓冲器（3-状态，反转）说明书

MC74LCX240Low-Voltage CMOSOctal BufferWith 5 V−Tolerant Inputs and Outputs (3−State, Inverting)The MC74LCX240 is a high performance, inverting octal buffer operating from a 2.3 to 3.6 V supply. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A V I specification of 5.5 V allows MC74LCX240 inputs to be safely driven from 5 V devices. The MC74LCX240 is suitable for memory address driving and all TTL level bus oriented transceiver applications. Current drive capability is 24 mA at the outputs. The Output Enable (OE) input, when HIGH, disables the outputs by placing them in a HIGH Z condition.Features•Designed for 2.3 to 3.6 V V CC Operation•5 V Tolerant − Interface Capability With 5 V TTL Logic •Supports Live Insertion and Withdrawal•I OFF Specification Guarantees High Impedance When V CC = 0 V•L VTTL Compatible•L VCMOS Compatible•24 mA Balanced Output Sink and Source Capability•Near Zero Static Supply Current in All Three Logic States (10 m A) Substantially Reduces System Power Requirements •Latchup Performance Exceeds 500 mA•ESD Performance:♦Human Body Model >2000 V♦Machine Model >200 V•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant120MARKINGDIAGRAMSSOIC−20 WBDW SUFFIXCASE 751DLCX240ALYWGGTSSOP−20DT SUFFIXCASE 948E1See detailed ordering and shipping information in the package dimensions section on page 3 of this data sheet.ORDERING INFORMATIONA= Assembly LocationWL, L= Wafer LotYY, Y= YearWW, W= Work WeekG or G= Pb−Free Package(Note: Microdot may be in either location)Figure 1. Pinout: 20−Lead (Top View)192018171615142134567V CC 13812911102OE 1O02D01O12D11O22D21O32D31OE1D02O01D12O11D22O21D32O3GNDFigure 2. LOGIC DIAGRAM1OE1D01O01D11O11D21O21D31O32OE2D02O02D12O12D22O22D32O3TRUTH TABLEINPUTS OUTPUTS 1OE 2OE 1Dn 2Dn 1On, 2OnL L H L H L H XZH =High Voltage Level L =Low Voltage Level Z =High Impedance StateX=High or Low Voltage Level and Transitions Are Acceptable; for I CC reasons, DO NOT FLOAT InputsORDERING INFORMATIONDevice Package Shipping†MC74LCX240DTR2G TSSOP−20 (Pb−Free)2500 Tape & ReelMC74LCX240DWR2G SOIC−20 WB (Pb−Free)1000 Tape & Reel†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.MAXIMUM RATINGSSymbol Parameter Value Condition Units V CC DC Supply Voltage−0.5 to +7.0V V I DC Input Voltage−0.5 ≤ V I≤ +7.0V V O DC Output Voltage−0.5 ≤ V O≤ +7.0Output in 3−State V−0.5 ≤ V O≤ V CC + 0.5Note 1VI IK DC Input Diode Current−50V I < GND mAI OK DC Output Diode Current−50V O < GND mA+50V O > V CC mAI O DC Output Source/Sink Current±50mAI CC DC Supply Current Per Supply Pin±100mAI GND DC Ground Current Per Ground Pin±100mAT STG Storage Temperature Range−65 to +150°C MSL Moisture Sensitivity Level 1Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.1.Output in HIGH or LOW State. I O absolute maximum rating must be observed.RECOMMENDED OPERATING CONDITIONSSymbol Parameter Min Typ Max UnitsV CC Supply VoltageOperatingData Retention Only 2.01.53.33.33.63.6VV I Input Voltage0 5.5VV O Output VoltageHIGH or LOW State3−State 0V CC5.5VI OH HIGH Level Output Current, V CC = 3.0 V − 3.6 V−24mAI OL LOW Level Output Current, V CC = 3.0 V − 3.6 V24mAI OH HIGH Level Output Current, V CC = 2.7 V − 3.0 V−12mAI OL LOW Level Output Current, V CC = 2.7 V − 3.0 V12mAT A Operating Free−Air Temperature−40+125°C D t/D V Input Transition Rise or Fall Rate, V IN from 0.8 V to 2.0 V, V CC = 3.0 V010ns/VDC ELECTRICAL CHARACTERISTICST A = −40°C to +85°C T A = −40°C to +125°C Symbol Characteristic Condition Min Max Min Max Units V IH HIGH Level InputVoltage (Note 2)2.7 V ≤ V CC≤3.6 V 2.0 2.0VV IL LOW Level InputVoltage (Note 2)2.7 V ≤ V CC≤3.6 V0.80.8VV OH HIGH Level OutputVoltage2.7 V ≤ V CC≤3.6 V; I OH = −100 m A V CC−0.2V CC−0.2VV CC = 2.7 V; I OH = −12 mA 2.2 2.2V CC = 3.0 V; I OH = −18 mA 2.4 2.4V CC = 3.0 V; I OH = −24 mA 2.2 2.22.These values of V I are used to test DC electrical characteristics only.DC ELECTRICAL CHARACTERISTICS(Continued)T A = −40°C to +85°C T A = −40°C to +125°C Symbol Characteristic Condition Min Max Min Max Units V OL LOW Level OutputVoltage2.7 V ≤ V CC≤3.6 V; I OL = 100 m A0.20.2VV CC = 2.7 V; I OL = 12 mA0.40.4V CC = 3.0 V; I OL = 16 mA0.40.4V CC = 3.0 V; I OL = 24 mA0.550.6I OZ3−State Output Current V CC = 3.6 V, V IN = V IH or V IL,V OUT = 0 to 5.5 V±5±5m AI OFF Power Off LeakageCurrentV CC = 0, V IN = 5.5 V or V OUT = 5.5 V1010m AI IN Input Leakage Current V CC = 3.6 V, V IN = 5.5 V or GND±5±5m A I CC Quiescent Supply Current V CC = 3.6 V, V IN = 5.5 V or GND1010m A D I CC Increase in I CC per Input 2.3 ≤ V CC≤ 3.6 V; V IH = V CC− 0.6 V500500m A AC CHARACTERISTICS(t R = t F = 2.5 ns; C L = 50 pF; R L = 500 W)LimitsT A = −40°C to +125°CV CC = 3.0 V to 3.6 V V CC = 2.7 VSymbol Parameter Waveform Min Max Max Unitst PLH t PHL Propagation DelayInput to Output1 1.51.56.56.57.57.5nst PZH t PZL Output Enable Time toHigh and Low Level2 1.51.58.08.09.09.0nst PHZ t PLZ Output Disable Time FromHigh and Low Level2 1.51.57.07.08.08.0nst OSHL t OSLH Output−to−Output Skew(Note 3)1.01.0ns3.Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.The specification applies to any outputs switching in the same direction, either HIGH−to−LOW (t OSHL) or LOW−to−HIGH (t OSLH); parameter guaranteed by design.DYNAMIC SWITCHING CHARACTERISTICST A = +25°CSymbol Characteristic Condition Min Typ Max Units V OLP Dynamic LOW Peak Voltage (Note 4)V CC = 3.3 V, C L = 50 pF, V IH = 3.3 V, V IL = 0 V0.8V V OLV Dynamic LOW Valley Voltage (Note 4)V CC = 3.3 V, C L = 50 pF, V IH = 3.3 V, V IL = 0 V0.8V 4.Number of outputs defined as “n”. Measured with “n−1” outputs switching from HIGH−to−LOW or LOW−to−HIGH. The remaining output ismeasured in the LOW state.CAPACITIVE CHARACTERISTICSSymbol Parameter Condition Typical UnitsC IN Input Capacitance V CC = 3.3 V, V I = 0 V or V CC7pFC OUT Output Capacitance V CC = 3.3 V, V I = 0 V or V CC8pFC PD Power Dissipation Capacitance10 MHz, V CC = 3.3 V, V I = 0 V or V CC25pFWAVEFORM 1 - PROPAGATION DELAYS t R = t F = 2.5 ns, 10% to 90%; f = 1 MHz; t W = 500 ns2.7 V0 VV OHV OL1Dn, 2Dn1On, 2OnWAVEFORM 2 - OUTPUT ENABLE AND DISABLE TIMES t R = t F = 2.5 ns, 10% to 90%; f = 1 MHz; t W = 500 ns2.7 V0 V ≈ 0 V1OE, 2OE1On, 2On≈ 3.0 V1On, 2OnFigure 3. WaveformsV CCV OH - 0.3 V V OL + 0.3 V GNDOPEN V 6V GNDTESTSWITCH t PLH , t PHL Open t PZL , t PLZ6V Open Collector/Drain t PLH and t PHL 6V t PZH , t PHZGNDC L = 50pF or equivalent (Includes jig and probe capacitance)R L = R 1 = 500W or equivalentR T = Z OUT of pulse generator (typically 50W )Figure 4. Test CircuitTSSOP −20CASE 948E ISSUE DDIM A MIN MAX MIN MAX INCHES 6.600.260MILLIMETERS B 4.30 4.500.1690.177C 1.200.047D 0.050.150.0020.006F 0.500.750.0200.030G 0.65 BSC 0.026 BSCH 0.270.370.0110.015J 0.090.200.0040.008J10.090.160.0040.006K 0.190.300.0070.012K10.190.250.0070.010L 6.40 BSC 0.252 BSC M 0 8 0 8 ____NOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION:MILLIMETER.3.DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE.4.DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION.INTERLEAD FLASH OR PROTRUSIONSHALL NOT EXCEED 0.25 (0.010) PER SIDE.5.DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08(0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION.6.TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY .7.DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE −W −.DETAIL E6.400.252------16X0.360.65PITCHSOLDERING FOOTPRINT**For additional information on our Pb −Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.M0.25SA SBTDIM MIN MAXMILLIMETERSA 2.35 2.65A10.100.25B0.350.49C0.230.32D12.6512.95E7.407.60e 1.27 BSCH10.0510.55h0.250.75L0.500.90q0 7NOTES:1.DIMENSIONS ARE IN MILLIMETERS.2.INTERPRET DIMENSIONS AND TOLERANCESPER ASME Y14.5M, 1994.3.DIMENSIONS D AND E DO NOT INCLUDE MOLDPROTRUSION.4.MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.5.DIMENSION B DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE PROTRUSIONSHALL BE 0.13 TOTAL IN EXCESS OF BDIMENSION AT MAXIMUM MATERIALCONDITION.__SO−20 WBCASE 751D−05ISSUE H20XDIMENSIONS: MILLIMETERS*For additional information on our Pb−Free strategy and solderingdetails, please download the ON Semiconductor Soldering andMounting Techniques Reference Manual, SOLDERRM/D.SOLDERING FOOTPRINT*RECOMMENDEDON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent PUBLICATION ORDERING INFORMATION。

protle元件查找说明

大家是否觉得在制作电路图时花时间做长的就是找元件，现在我就和大家分享一些这个文档！让你们轻松解决寻找常用电子元件的问题！protel dxp 2004 元件库中的常用元件初学protel DXP 碰到最多的问题就是：不知道元件放在哪个库中。

这里我收集了DXP2004常用元件库下常见的元件。

使用时，只需在libary中选择相应的元件库后，输入英文的前几个字母就可看到相应的元件了。

通过添加通配符*，可以扩大选择范围。

下面这些库元件都是DXP 2004自带的不用下载。

########### DXP2004下Miscellaneous Devices.Intlib元件库中常用元件有：电阻系列（res*）排组（res pack*）电感（inductor*）电容（cap*，capacitor*）二极管系列（diode*，d*）三极管系列（npn*，pnp*，mos*，MOSFET*，MESFET*，jfet*，IGBT*）运算放大器系列（op*）继电器（relay*）8位数码显示管（dpy*）电桥（bri*bridge）光电耦合器( opto* ，optoisolator )光电二极管、三极管（photo*）模数转换、数模转换器（adc-8，dac-8）晶振（xtal）电源（battery）喇叭（speaker）麦克风（mic*）小灯泡（lamp*）响铃（bell）天线（antenna）保险丝（fuse*）开关系列（sw*）跳线（jumper*）变压器系列（trans*）？？？？（tube*）（scr）（neon）（buzzer）（coax）晶振（crystal oscillator）的元件库名称是Miscellaneous Devices.Intlib, 在search栏中输入 *soc 即可。

########### DXP2004下Miscellaneous connectors.Intlib元件库中常用元件有：(con*，connector*)(header*)(MHDR*)定时器NE555P 在库TI analog timer circit.Intlib中电阻 AXIAL无极性电容 RAD电解电容 RB-电位器 VR二极管 DIODE三极管 TO电源稳压块78和79系列 TO-126H和TO-126V场效应管和三极管一样整流桥 D-44 D-37 D-46单排多针插座 CON SIP双列直插元件 DIP晶振 XTAL1电阻:RES1,RES2,RES3,RES4;封装属性为axial系列无极性电容:cap;封装属性为RAD-0.1到rad-0.4电解电容:electroi;封装属性为rb.2/.4到rb.5/1.0电位器:pot1,pot2;封装属性为vr-1到vr-5二极管:封装属性为diode-0.4(小功率)diode-0.7(大功率)三极管:常见的封装属性为to-18(普通三极管)to-22(大功率三极管)to-3(大功率达林顿管)电源稳压块有78和79系列;78系列如7805,7812,7820等79系列有7905,7912,7920等常见的封装属性有to126h和to126v整流桥:BRIDGE1,BRIDGE2: 封装属性为D系列(D-44,D-37,D-46)电阻: AXIAL0.3-AXIAL0.7 其中0.4-0.7指电阻的长度,一般用AXIAL0.4 瓷片电容:RAD0.1-RAD0.3. 其中0.1-0.3指电容大小,一般用RAD0.1电解电容:RB.1/.2-RB.4/.8 其中.1/.2-.4/.8指电容大小.一般<100uF用RB.1/.2,100uF-470uF用RB.2/.4,>470uF用RB.3/.6二极管: DIODE0.4-DIODE0.7 其中0.4-0.7指二极管长短,一般用DIODE0.4 发光二极管:RB.1/.2 ，led集成块: DIP8-DIP40, 其中8-40指有多少脚,8脚的就是DIP8贴片电阻0603表示的是封装尺寸与具体阻值没有关系但封装尺寸与功率有关通常来说0201 1/20W0402 1/16W0603 1/10W0805 1/8W1206 1/4W电容电阻外形尺寸与封装的对应关系是:0402=1.0x0.50603=1.6x0.80805=2.0x1.21206=3.2x1.61210=3.2x2.51812=4.5x3.22225=5.6x6.5关于零件封装我们在前面说过,除了DEVICE.LIB库中的元件外,其它库的元件都已经有了固定的元件封装,这是因为这个库中的元件都有多种形式:以晶体管为例说明一下:晶体管是我们常用的的元件之一,在DEVICE.LIB库中,简简单单的只有NPN与PNP之分,但实际上,如果它是NPN的2N3055那它有可能是铁壳子的TO—3,如果它是NPN的2N3054,则有可能是铁壳的TO-66或TO-5,而学用的CS9013,有TO-92A,TO-92B,还有TO-5,TO-46,TO-52等等,千变万化.还有一个就是电阻,在DEVICE库中,它也是简单地把它们称为RES1和RES2,不管它是100Ω还是470KΩ都一样,对电路板而言,它与欧姆数根本不相关,完全是按该电阻的功率数来决定的我们选用的1/4W和甚至1/2W的电阻,都可以用AXIAL0.3元件封装,而功率数大一点的话,可用AXIAL0.4,AXIAL0.5等等.现将常用的元件封装整理如下:电阻类及无极性双端元件 AXIAL0.3-AXIAL1.0无极性电容 RAD0.1-RAD0.4有极性电容 RB.2/.4-RB.5/1.0二极管 DIODE0.4及 DIODE0.7石英晶体振荡器 XTAL1晶体管、FET、UJT TO-xxx(TO-3,TO-5)可变电阻(POT1、POT2) VR1-VR5当然,我们也可以打开C:\Client98\PCB98\library\advpcb.lib库来查找所用零件的对应封装.这些常用的元件封装,大家最好能把它背下来,这些元件封装,大家可以把它拆分成两部分来记如电阻AXIAL0.3可拆成AXIAL和0.3,AXIAL翻译成中文就是轴状的,0.3则是该电阻在印刷电路板上的焊盘间的距离也就是300mil(因为在电机领域里,是以英制单位为主的.同样的,对于无极性的电容,RAD0.1-RAD0.4也是一样;对有极性的电容如电解电容,其封装为RB.2/.4,RB.3/.6等,其中“.2”为焊盘间距,“.4”为电容圆筒的外径.对于晶体管,那就直接看它的外形及功率,大功率的晶体管,就用TO—3,中功率的晶体管,如果是扁平的,就用TO-220,如果是金属壳的,就用TO-66,小功率的晶体管,就用TO-5,TO-46,TO-92A等都可以,反正它的管脚也长,弯一下也可以.对于常用的集成IC电路,有DIPxx,就是双列直插的元件封装,DIP8就是双排,每排有4个引脚,两排间距离是300mil,焊盘间的距离是100mil.SIPxx就是单排的封装.等等.值得我们注意的是晶体管与可变电阻,它们的包装才是最令人头痛的,同样的包装,其管脚可不一定一样.例如,对于TO-92B之类的包装,通常是1脚为E(发射极),而2脚有可能是B极(基极),也可能是C(集电极);同样的,3脚有可能是C,也有可能是B,具体是那个,只有拿到了元件才能确定.因此,电路软件不敢硬性定义焊盘名称(管脚名称),同样的,场效应管,MOS管也可以用跟晶体管一样的封装,它可以通用于三个引脚的元件.Q1-B,在PCB里,加载这种网络表的时候,就会找不到节点(对不上).在可变电阻上也同样会出现类似的问题;在原理图中,可变电阻的管脚分别为1、W、及2,所产生的网络表,就是1、2和W,在PCB电路板中,焊盘就是1,2,3.当电路中有这两种元件时,就要修改PCB与SCH之间的差异最快的方法是在产生网络表后,直接在网络表中,将晶体管管脚改为1,2,3;将可变电阻的改成与电路板元件外形一样的1,2,3即可. 原理图常用库文件：Miscellaneous Devices.ddbDallas Microprocessor.ddbIntel Databooks.ddbProtel DOS Schematic Libraries.ddbPCB元件常用库：Advpcb.ddbGeneral IC.ddbMiscellaneous.ddbProtel Dos Schematic 4000 Cmos .Lib 40系列CMOS管集成块元件库4013 D 触发器4027 JK 触发器Protel Dos Schematic Analog Digital.Lib 模拟数字式集成块元件库AD系列DAC系列HD系列MC系列Protel Dos Schematic Comparator.Lib 比较放大器元件库Protel Dos Shcematic Intel.Lib INTEL公司生产的80系列CPU集成块元件库Protel Dos Schematic Linear.lib 线性元件库例555Protel Dos Schemattic Memory Devices.Lib 内存存储器元件库Protel Dos Schematic SYnertek.Lib SY系列集成块元件库Protes Dos Schematic Motorlla.Lib 摩托罗拉公司生产的元件库Protes Dos Schematic NEC.lib NEC公司生产的集成块元件库Protes Dos Schematic Operationel Amplifers.lib 运算放大器元件库Protes Dos Schematic TTL.Lib 晶体管集成块元件库74系列Protel Dos Schematic Voltage Regulator.lib 电压调整集成块元件库Protes Dos Schematic Zilog.Lib 齐格格公司生产的Z80系列CPU集成块元件库分立元件库部分分立元件库元件名称及中英对照AND 与门ANTENNA 天线BATTERY 直流电源BELL 铃,钟BVC 同轴电缆接插件BRIDEG 1 整流桥(二极管)BRIDEG 2 整流桥(集成块)BUFFER 缓冲器BUZZER 蜂鸣器CAP 电容CAPACITOR 电容CAPACITOR POL 有极性电容CAPVAR 可调电容CIRCUIT BREAKER 熔断丝COAX 同轴电缆CON 插口CRYSTAL 晶体整荡器DB 并行插口DIODE 二极管DIODE SCHOTTKY 稳压二极管DIODE VARACTOR 变容二极管DPY_3-SEG 3段LEDDPY_7-SEG 7段LEDDPY_7-SEG_DP 7段LED(带小数点)ELECTRO 电解电容FUSE 熔断器INDUCTOR 电感INDUCTOR IRON 带铁芯电感INDUCTOR3 可调电感JFET N N沟道场效应管JFET P P沟道场效应管LAMP 灯泡LAMP NEDN 起辉器LED 发光二极管METER 仪表MICROPHONE 麦克风MOSFET MOS管MOTOR AC 交流电机MOTOR SERVO 伺服电机NAND 与非门NOR 或非门NOT 非门NPN NPN三极管NPN-PHOTO 感光三极管OPAMP 运放OR 或门PHOTO 感光二极管PNP 三极管NPN DAR NPN三极管PNP DAR PNP三极管POT 滑线变阻器PELAY-DPDT 双刀双掷继电器RES1.2 电阻RES3.4 可变电阻RESISTOR BRIDGE ? 桥式电阻RESPACK ? 电阻SCR 晶闸管PLUG ? 插头PLUG AC FEMALE 三相交流插头SOCKET ? 插座SOURCE CURRENT 电流源SOURCE VOLTAGE 电压源SPEAKER 扬声器SW ? 开关SW-DPDY ? 双刀双掷开关SW-SPST ? 单刀单掷开关SW-PB 按钮THERMISTOR 电热调节器TRANS1 变压器TRANS2 可调变压器TRIAC ? 三端双向可控硅TRIODE ? 三极真空管VARISTOR 变阻器ZENER ? 齐纳二极管DPY_7-SEG_DP 数码管SW-PB 开关74系列：74LS00 TTL 2输入端四与非门74LS01 TTL 集电极开路2输入端四与非门74LS02 TTL 2输入端四或非门74LS03 TTL 集电极开路2输入端四与非门74LS122 TTL 可再触发单稳态多谐振荡器74LS123 TTL 双可再触发单稳态多谐振荡器74LS125 TTL 三态输出高有效四总线缓冲门74LS126 TTL 三态输出低有效四总线缓冲门74LS13 TTL 4输入端双与非施密特触发器74LS132 TTL 2输入端四与非施密特触发器74LS133 TTL 13输入端与非门74LS136 TTL 四异或门74LS138 TTL 3-8线译码器/复工器74LS139 TTL 双2-4线译码器/复工器74LS14 TTL 六反相施密特触发器74LS145 TTL BCD—十进制译码/驱动器74LS15 TTL 开路输出3输入端三与门74LS150 TTL 16选1数据选择/多路开关74LS151 TTL 8选1数据选择器74LS153 TTL 双4选1数据选择器74LS154 TTL 4线—16线译码器74LS155 TTL 图腾柱输出译码器/分配器74LS156 TTL 开路输出译码器/分配器74LS157 TTL 同相输出四2选1数据选择器74LS158 TTL 反相输出四2选1数据选择器74LS16 TTL 开路输出六反相缓冲/驱动器74LS160 TTL 可预置BCD异步清除计数器74LS161 TTL 可予制四位二进制异步清除计数器74LS162 TTL 可预置BCD同步清除计数器74LS163 TTL 可予制四位二进制同步清除计数器74LS164 TTL 八位串行入/并行输出移位寄存器74LS165 TTL 八位并行入/串行输出移位寄存器74LS166 TTL 八位并入/串出移位寄存器74LS169 TTL 二进制四位加/减同步计数器74LS17 TTL 开路输出六同相缓冲/驱动器74LS170 TTL 开路输出4×4寄存器堆74LS173 TTL 三态输出四位D型寄存器74LS174 TTL 带公共时钟和复位六D触发器74LS175 TTL 带公共时钟和复位四D触发器74LS180 TTL 9位奇数/偶数发生器/校验器74LS181 TTL 算术逻辑单元/函数发生器74LS185 TTL 二进制—BCD代码转换器74LS190 TTL BCD同步加/减计数器74LS191 TTL 二进制同步可逆计数器74LS192 TTL 可预置BCD双时钟可逆计数器74LS193 TTL 可预置四位二进制双时钟可逆计数器74LS194 TTL 四位双向通用移位寄存器74LS195 TTL 四位并行通道移位寄存器74LS196 TTL 十进制/二-十进制可预置计数锁存器74LS197 TTL 二进制可预置锁存器/计数器74LS20 TTL 4输入端双与非门74LS21 TTL 4输入端双与门74LS22 TTL 开路输出4输入端双与非门74LS221 TTL 双/单稳态多谐振荡器74LS240 TTL 八反相三态缓冲器/线驱动器74LS241 TTL 八同相三态缓冲器/线驱动器74LS243 TTL 四同相三态总线收发器74LS244 TTL 八同相三态缓冲器/线驱动器74LS245 TTL 八同相三态总线收发器74LS247 TTL BCD—7段15V输出译码/驱动器74LS248 TTL BCD—7段译码/升压输出驱动器74LS249 TTL BCD—7段译码/开路输出驱动器74LS251 TTL 三态输出8选1数据选择器/复工器74LS253 TTL 三态输出双4选1数据选择器/复工器74LS256 TTL 双四位可寻址锁存器74LS257 TTL 三态原码四2选1数据选择器/复工器74LS258 TTL 三态反码四2选1数据选择器/复工器74LS259 TTL 八位可寻址锁存器/3-8线译码器74LS26 TTL 2输入端高压接口四与非门74LS260 TTL 5输入端双或非门74LS266 TTL 2输入端四异或非门74LS27 TTL 3输入端三或非门74LS273 TTL 带公共时钟复位八D触发器74LS279 TTL 四图腾柱输出S-R锁存器74LS28 TTL 2输入端四或非门缓冲器74LS283 TTL 4位二进制全加器74LS290 TTL 二/五分频十进制计数器74LS293 TTL 二/八分频四位二进制计数器74LS295 TTL 四位双向通用移位寄存器74LS298 TTL 四2输入多路带存贮开关74LS299 TTL 三态输出八位通用移位寄存器74LS30 TTL 8输入端与非门74LS32 TTL 2输入端四或门74LS322 TTL 带符号扩展端八位移位寄存器74LS323 TTL 三态输出八位双向移位/存贮寄存器74LS33 TTL 开路输出2输入端四或非缓冲器74LS347 TTL BCD—7段译码器/驱动器74LS352 TTL 双4选1数据选择器/复工器74LS353 TTL 三态输出双4选1数据选择器/复工器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS366 TTL 门使能输入三态输出六反相线驱动器74LS367 TTL 4/2线使能输入三态六同相线驱动器74LS368 TTL 4/2线使能输入三态六反相线驱动器74LS37 TTL 开路输出2输入端四与非缓冲器74LS373 TTL 三态同相八D锁存器74LS374 TTL 三态反相八D锁存器74LS375 TTL 4位双稳态锁存器74LS377 TTL 单边输出公共使能八D锁存器74LS378 TTL 单边输出公共使能六D锁存器74LS379 TTL 双边输出公共使能四D锁存器74LS38 TTL 开路输出2输入端四与非缓冲器74LS380 TTL 多功能八进制寄存器74LS39 TTL 开路输出2输入端四与非缓冲器74LS390 TTL 双十进制计数器74LS393 TTL 双四位二进制计数器74LS40 TTL 4输入端双与非缓冲器74LS42 TTL BCD—十进制代码转换器74LS352 TTL 双4选1数据选择器/复工器74LS353 TTL 三态输出双4选1数据选择器/复工器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS366 TTL 门使能输入三态输出六反相线驱动器74LS367 TTL 4/2线使能输入三态六同相线驱动器74LS368 TTL 4/2线使能输入三态六反相线驱动器74LS37 TTL 开路输出2输入端四与非缓冲器74LS373 TTL 三态同相八D锁存器74LS374 TTL 三态反相八D锁存器74LS375 TTL 4位双稳态锁存器74LS377 TTL 单边输出公共使能八D锁存器74LS378 TTL 单边输出公共使能六D锁存器74LS379 TTL 双边输出公共使能四D锁存器74LS38 TTL 开路输出2输入端四与非缓冲器74LS380 TTL 多功能八进制寄存器74LS39 TTL 开路输出2输入端四与非缓冲器74LS390 TTL 双十进制计数器74LS393 TTL 双四位二进制计数器74LS40 TTL 4输入端双与非缓冲器74LS42 TTL BCD—十进制代码转换器74LS447 TTL BCD—7段译码器/驱动器74LS45 TTL BCD—十进制代码转换/驱动器74LS450 TTL 16:1多路转接复用器多工器74LS451 TTL 双8:1多路转接复用器多工器74LS453 TTL 四4:1多路转接复用器多工器74LS46 TTL BCD—7段低有效译码/驱动器74LS460 TTL 十位比较器74LS461 TTL 八进制计数器74LS465 TTL 三态同相2与使能端八总线缓冲器74LS466 TTL 三态反相2与使能八总线缓冲器74LS467 TTL 三态同相2使能端八总线缓冲器74LS468 TTL 三态反相2使能端八总线缓冲器74LS469 TTL 八位双向计数器74LS47 TTL BCD—7段高有效译码/驱动器74LS48 TTL BCD—7段译码器/内部上拉输出驱动74LS490 TTL 双十进制计数器74LS491 TTL 十位计数器74LS498 TTL 八进制移位寄存器74LS50 TTL 2-3/2-2输入端双与或非门74LS502 TTL 八位逐次逼近寄存器74LS503 TTL 八位逐次逼近寄存器74LS51 TTL 2-3/2-2输入端双与或非门74LS533 TTL 三态反相八D锁存器74LS534 TTL 三态反相八D锁存器74LS54 TTL 四路输入与或非门74LS540 TTL 八位三态反相输出总线缓冲器74LS55 TTL 4输入端二路输入与或非门74LS563 TTL 八位三态反相输出触发器74LS564 TTL 八位三态反相输出D触发器74LS573 TTL 八位三态输出触发器74LS574 TTL 八位三态输出D触发器74LS645 TTL 三态输出八同相总线传送接收器74LS670 TTL 三态输出4×4寄存器堆74LS73 TTL 带清除负触发双J-K触发器74LS74 TTL 带置位复位正触发双D触发器74LS76 TTL 带预置清除双J-K触发器74LS83 TTL 四位二进制快速进位全加器74LS85 TTL 四位数字比较器74LS86 TTL 2输入端四异或门74LS90 TTL 可二/五分频十进制计数器74LS93 TTL 可二/八分频二进制计数器74LS95 TTL 四位并行输入\\输出移位寄存器74LS97 TTL 6位同步二进制乘法器CD系列：：CD4000 双3输入端或非门+单非门TICD4001 四2输入端或非门HIT/NSC/TI/GOLCD4002 双4输入端或非门NSCCD4006 18位串入/串出移位寄存器NSCCD4007 双互补对加反相器NSCCD4008 4位超前进位全加器NSCCD4009 六反相缓冲/变换器NSCCD4010 六同相缓冲/变换器NSCCD4011 四2输入端与非门HIT/TICD4012 双4输入端与非门NSCCD4013 双主-从D型触发器FSC/NSC/TOSCD4014 8位串入/并入-串出移位寄存器NSCCD4015 双4位串入/并出移位寄存器TICD4016 四传输门FSC/TICD4017 十进制计数/分配器FSC/TI/MOTCD4018 可预制1/N计数器NSC/MOTCD4019 四与或选择器PHICD4020 14级串行二进制计数/分频器FSCCD4021 08位串入/并入-串出移位寄存器PHI/NSC CD4022 八进制计数/分配器NSC/MOTCD4024 7级二进制串行计数/分频器NSC/MOT/TICD4025 三3输入端或非门NSC/MOT/TICD4026 十进制计数/7段译码器NSC/MOT/TICD4027 双J-K触发器NSC/MOT/TICD4028 BCD码十进制译码器NSC/MOT/TICD4029 可预置可逆计数器NSC/MOT/TICD4030 四异或门NSC/MOT/TI/GOLCD4031 64位串入/串出移位存储器NSC/MOT/TICD4032 三串行加法器NSC/TICD4033 十进制计数/7段译码器NSC/TICD4034 8位通用总线寄存器NSC/MOT/TICD4035 4位并入/串入-并出/串出移位寄存NSC/MOT/TI CD4038 三串行加法器NSC/TICD4040 12级二进制串行计数/分频器NSC/MOT/TICD4041 四同相/反相缓冲器NSC/MOT/TICD4042 四锁存D型触发器NSC/MOT/TICD4043 4三态R-S锁存触发器("1"触发) NSC/MOT/TI CD4044 四三态R-S锁存触发器("0"触发) NSC/MOT/TI CD4046 锁相环NSC/MOT/TI/PHICD4047 无稳态/单稳态多谐振荡器NSC/MOT/TICD4048 4输入端可扩展多功能门NSC/HIT/TICD4049 六反相缓冲/变换器NSC/HIT/TICD4050 六同相缓冲/变换器NSC/MOT/TICD4051 八选一模拟开关NSC/MOT/TICD4052 双4选1模拟开关NSC/MOT/TICD4053 三组二路模拟开关NSC/MOT/TICD4054 液晶显示驱动器NSC/HIT/TICD4055 BCD-7段译码/液晶驱动器NSC/HIT/TICD4056 液晶显示驱动器NSC/HIT/TICD4059 “N”分频计数器NSC/TICD4060 14级二进制串行计数/分频器NSC/TI/MOTCD4063 四位数字比较器NSC/HIT/TICD4066 四传输门NSC/TI/MOTCD4067 16选1模拟开关NSC/TICD4069 六反相器NSC/HIT/TICD4070 四异或门NSC/HIT/TICD4071 四2输入端或门NSC/TICD4072 双4输入端或门NSC/TICD4073 三3输入端与门NSC/TICD4075 三3输入端或门NSC/TICD4076 四D寄存器CD4077 四2输入端异或非门HITCD4078 8输入端或非门/或门CD4081 四2输入端与门NSC/HIT/TICD4082 双4输入端与门NSC/HIT/TICD4085 双2路2输入端与或非门CD4086 四2输入端可扩展与或非门CD4089 二进制比例乘法器CD4093 四2输入端施密特触发器NSC/MOT/STCD4094 8位移位存储总线寄存器NSC/TI/PHICD4095 3输入端J-K触发器CD4096 3输入端J-K触发器CD4097 双路八选一模拟开关CD4098 双单稳态触发器NSC/MOT/TICD4099 8位可寻址锁存器NSC/MOT/STCD40100 32位左/右移位寄存器CD40101 9位奇偶较验器CD40102 8位可预置同步BCD减法计数器CD40103 8位可预置同步二进制减法计数器CD40104 4位双向移位寄存器CD40105 先入先出FI-FD寄存器CD40106 六施密特触发器NSC\\TICD40107 双2输入端与非缓冲/驱动器HAR\\TICD40108 4字×4位多通道寄存器CD40109 四低-高电平位移器CD4529 双四路/单八路模拟开关CD4530 双5输入端优势逻辑门CD4531 12位奇偶校验器CD4532 8位优先编码器CD4536 可编程定时器CD4538 精密双单稳CD4539 双四路数据选择器CD4541 可编程序振荡/***CD4543 BCD七段锁存译码,驱动器CD4544 BCD七段锁存译码,驱动器CD4547 BCD七段译码/大电流驱动器CD4549 函数近似寄存器CD4551 四2通道模拟开关CD4553 三位BCD计数器CD4555 双二进制四选一译码器/分离器CD4556 双二进制四选一译码器/分离器CD4558 BCD八段译码器CD4560 "N"BCD加法器CD4561 "9"求补器CD4573 四可编程运算放大器CD4574 四可编程电压比较器CD4575 双可编程运放/比较器CD4583 双施密特触发器CD4584 六施密特触发器CD4585 4位数值比较器CD4599 8位可寻址锁存器CD40110 十进制加/减,计数,锁存,译码驱动STCD40147 10-4线编码器NSC\\MOTCD40160 可预置BCD加计数器NSC\\MOTCD40161 可预置4位二进制加计数器NSC\\MOTCD40162 BCD加法计数器NSC\\MOTCD40163 4位二进制同步计数器NSC\\MOTCD40174 六锁存D型触发器NSC\\TI\\MOTCD40175 四D型触发器NSC\\TI\\MOTCD40181 4位算术逻辑单元/函数发生器CD40182 超前位发生器CD40192 可预置BCD加/减计数器(双时钟) NSC\\TI CD40193 可预置4位二进制加/减计数器NSC\\TICD40194 4位并入/串入-并出/串出移位寄存NSC\\MOTCD40195 4位并入/串入-并出/串出移位寄存NSC\\MOTCD40208 4×4多端口寄存器型号器件名称CD4501 4输入端双与门及2输入端或非门CD4502 可选通三态输出六反相/缓冲器CD4503 六同相三态缓冲器CD4504 六电压转换器CD4506 双二组2输入可扩展或非门CD4508 双4位锁存D型触发器CD4510 可预置BCD码加/减计数器CD4511 BCD锁存,7段译码,驱动器CD4512 八路数据选择器CD4513 BCD锁存,7段译码,驱动器(消隐)CD4514 4位锁存,4线-16线译码器CD4515 4位锁存,4线-16线译码器CD4516 可预置4位二进制加/减计数器CD4517 双64位静态移位寄存器CD4518 双BCD同步加计数器CD4519 四位与或选择器CD4520 双4位二进制同步加计数器CD4521 24级分频器CD4522 可预置BCD同步1/N计数器CD4526 可预置4位二进制同步1/N计数器CD4527 BCD比例乘法器CD4528 双单稳态触发器注：同型号的74系列、74HC系列、74LS系列芯片，逻辑功能上是一样的。

TPL7407L高压低侧驱动器说明书

TPL7407L ZHCSC16A–JANUARY2014–REVISED JANUARY2014TPL7407L40V7通道低侧驱动器查询样片:TPL7407L特性应用范围•600mA额定漏极电流（每通道）•电感负载•7通道达灵顿(Darlington)阵列（例如–继电器ULN2003A）的CMOS引脚到引脚改进–单极步进&有刷直流电机•功耗（极低V OL）–螺线管&阀门–电流为100mA时，V OL低于达灵顿•发光二极管(LED)(Darlington)阵列的四分之一•逻辑电平位移•每通道小于10nA的极低输出泄露•栅极&绝缘栅双极型晶体管(IGBT)驱动•扩展环境温度范围：T A=-40°C至125°C说明•高压输出40V TPL7407L是一款高压、高电流NMOS晶体管阵列。

•与1.8V至5.0V微控制器和逻辑接口兼容这个器件包含7个特有高压输出的NMOS晶体管，这•用于感应反冲保护的内部自振荡二极管些晶体管具有针对开关电感负载的共阴极钳位二极管。

•输入下拉电阻器可实现三态输入驱动器一个单个NMOS通道的最大漏极电流额定值为•用来消除嘈杂环境中寄生运行的输入电阻电容(RC)600mA。

增加的全新稳压和驱动电路在整个通用输入缓冲器输出(GPIO)范围内(1.8V-5.0V)提供最大驱动强度。

•电感负载驱动器应用可将这些晶体管并联以实现更高的电流能力。

•静电放电(ESD)保护性能超过JESD22规范要求TPL7407L的主要优势是其经提升的效率以及低于双极–2kV人体模型(HBM)，500V充电器件模型达灵顿(Darlington)器件的泄露值。

借助于较低的(CDM)V OL，功率耗散比传统中继驱动器少一半，每通道的电•采用16引脚小外形尺寸集成电路(SOIC)和薄型小流少于250mA。

外形尺寸(TSSOP)封装器件信息订货编号封装（引脚）封装尺寸TPL7407L SOIC(16)9.9mm x3.91mmTPL7407L TSSOP(16) 5.0mm x4.4mm 简化电路原理图Please be aware that an important notice concerning availability,standard warranty,and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.TPL7407L TSSOP/SOICTPL7407LZHCSC16A –JANUARY 2014–REVISED JANUARY 2014These devices have limited built-in ESD protection.The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.TERMINAL CONFIGURATION AND FUNCTIONSTerminal FunctionsTERMINALDESCRIPTIONNAME NUMBER IN(X)1,2,3,4,5,6,7GPIO inputs that will drive the outputs "low"(or sinnk current)when driven "high"16,15,14,13,12,11,OUT(X)Driver output that sinks currents after input is driven "high"10COM 9Supply PIn that should be tied to 8.5V or higher for proper operation GND8Ground pinSpecificationsAbsolute Maximum Ratings (1)at 25°C free-air temperature (unless otherwise noted)MINMAX UNIT V OUT Pins OUT1-OUT7to GND voltage -0.342V V OK Ouput Clamp diode reverse voltage (2)-0.342V V COM COM pin voltage (2)-0.342V V IN Pins IN1-IN7to GND voltage (2)-0.330V I DS Continuous drain current per channel (3)(4)600mA I OK Output clamp current500mA I GND Total continuous GND-terminal current –2A T A Operating free-air temperature range –40125°C T J Operating virtual junction temperature -40150°C T stg Storage temperature range–65150°C(1)Stresses beyond those listed under "absolute maximum ratings"may cause permanent damage to the device.These are stress ratings only,and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions"is not implied.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.(2)All voltage values are with respect to the GND/substrate terminal,unless otherwise noted.(3)Maximum power dissipation is a function of T J (max),θJA ,and T A .The maximum allowable power dissipation at any allowable ambient temperature is P D =(T J (max)–T A )/θJA .Operating at the absolute maximum T J of 150°C can affect reliability.(4)The package thermal impedance is calculated in accordance with JESD 51-7.TPL7407L ZHCSC16A–JANUARY2014–REVISED JANUARY2014Thermal InformationTPL7407LTHERMAL METRIC(1)SOIC(D)TSSOP(PW)UNIT16PINS16PINSθJA Junction-to-ambient thermal resistance91.9115.2°C/WθJCtop Junction-to-case(top)thermal resistance50.149.5°C/WθJB Junction-to-board thermal resistance49.460.8°C/WψJT Junction-to-top characterization parameter18.68.5°C/WψJB Junction-to-board characterization parameter49.160.2°C/WθJCbot Junction-to-case(bottom)thermal resistance N/A N/A°C/W (1)For more information about traditional and new thermal metrics,see the IC Package Thermal Metrics application report,SPRA953.Recommended Operating ConditionsOver operating temperature rangeMIN NOM MAX UNITV OUT OUT1-OUT7pin voltage for recommended operation040VV COM COM pin voltage range for full output drive8.540VV IL IN1-IN7input low voltage("Off"high impedance output)0.9VV IH IN1-IN7input high voltage("Full Drive"low impedance output) 1.5VT J Operating virtual junction temperature-40125°CI DS Continuous drain current0500mAElectrical CharacteristicsT J=–40°C to125°C;Typical Values at T A=T J=25°CPARAMETER TEST CONDITIONS MIN TYP MAX UNITV IN≥1.5V I D=100mA200320 OUT1-OUT7low-level outputV OL(V DS)mV voltage I=200mA420650DI OUT(OFF)(I DS_OFF)OUT1-OUT7OFF-state leakage V OUT=24V,V IN≤1.0V10500nAcurrentV F Clamp forward voltage I F=200mA 1.4VI IN(off)IN1-IN7Off-state input current V INX=0V V OUT=40V500nAI IN(ON)IN1-IN7ON state input current V INX=1.5V-5.0V10μAI COM Static current flowing through COM V COM=8.5V-40V1525μApinSwitching CharacteristicsTypical Values at T A=T J=25°CPARAMETER TEST CONDITIONS MIN TYP MAX UNITPropagation delay time,low-to high-level350t PLH V INX≥1.65V,Vpullup=24V,Rpull-up=48Ωns outputPropagation delay time,high-to low-level350t PHL V INX≥1.65V,Vpullup=24V,Rpull-up=48Ωns outputC i Input capacitance V I=0,f=100KHz5pFTPL7407LZHCSC16A–JANUARY2014–REVISED Typical CharacteristicsOL DS(TSSOP)Cycle at25°C Cycle at70°CTPL7407L ZHCSC16A–JANUARY2014–REVISED JANUARY2014Typical Characteristics(continued)Cycle at25°C Cycle at70°C()J(MAX)A (MAX)JAT T PD -=q ND OLi Lii 1P V I ==´åTPL7407LZHCSC16A –JANUARY 2014–REVISED JANUARY 2014APPLICATION AND IMPLEMENTATIONTTL and other Logic InputsTPL7407L input interface is specified for standard 1.8V and 5V CMOS logic interface and can tolerate up to 30V.At any input voltage the output drivers will be driven at it's maximum when Vcom is greater than or equal to 8.5V.Input RC SnubberTPL7407L features an input RC snubber that helps prevent spurious switching in noisy environment.Connect an external 1k Ωto 5k Ωresistor in series with the input to further enhance TPL7407L’s noise tolerance.High-impedance Input DriversTPL7407L features a 1M Ωinput pull-down resistor.The presence of this resistor allows the input drivers to be tri-stated.When a high-impedance driver is connected to a channel input the TPL7407L detects the channel input as a low level input and remains in the OFF position.The input RC snubber helps improve noise tolerance when input drivers are in the high-impedance state.On-chip Power DissipationUse the below equation to calculate TPL7407L on-chip power dissipation P D :Where:N is the number of channels active together.V OLi is the OUT i pin voltage for the load current I Li .(1)Thermal ReliabilityIt is recommended to limit TPL7407L IC’s die junction temperature to less than 125°C.The IC junction temperature is directly proportional to the on-chip power e the following equation to calculate the maximum allowable on-chip power dissipation for a target IC junction temperature:Where:T J(MAX)is the target maximum junction temperature.T A is the operating ambient temperature.θJA is the package junction to ambient thermal resistance.(2)Improving Package Thermal PerformanceθJA value depends on the PC board layout.An external heat sink and/or a cooling mechanism,like a cold air fan,can help reduce θJA and thus improve device thermal capabilities.Refer to TI’s design support web page at /thermal for a general guidance on improving device thermal performance.TPL7407L ZHCSC16A–JANUARY2014–REVISED JANUARY2014 Application ExamplesUnipolar Stepper Motor DriverFigure9shows an implementation of TPL7407L for driving a uniploar stepper motor.The unconnected input channels can be used for other functions.When an input pin is left open the internal1MΩpull down resistor pulls the respective input pin to GND potential.For higher noise immunity use an external short across an unconnected input and GND pins.The COM pin must be tied to the supply of whichever inductive load is being driven for the driver to be protected by the free-wheeling diode.Figure9.TPL7407L as a Stepper Motor DriverTPL7407LZHCSC16A–JANUARY2014–REVISED Multi-Purpose Sink DriverWhen configured as per Figure10TPL7407L can be used as a multi-purpose driver.The output channels can be tied together to sink more current.TPL7407L can easily drive motors,relays&LEDs with little power dissipation. COM must be tied to highest load voltage,which may or may not be same as inductive load supply.VSUPFigure10.TPL7407L Multi-Purpose Sink Driver ApplicationTPL7407L ZHCSC16A–JANUARY2014–REVISED JANUARY2014 24V Relay DriverTo drive lower resistance relays,like<48Ω,connect two or more adjacent channels in parallel as shown in Figure11.Connecting several channels in parallel lowers the channel output resistance and increases the drive current.TPL7407L can be used for driving12V,24V&36V relays with similar a implementation.Figure11.TPL7407L Driving24V RelaysTPL7407LZHCSC16A–JANUARY2014–REVISED REVISION HISTORYChanges from Original(January2014)to Revision A Page •初次发布完整版本。

74HC238 74HCT238 3-到-8线解码器分复用器说明书

74HC238; 74HCT2383-to-8 line decoder/demultiplexerRev. 5 — 13 June 2018Product data sheet1General descriptionThe 74HC238; 74HCT238 decodes three binary weighted address inputs (A0, A1 andA2) to eight mutually exclusive outputs (Y0 to Y7). The device features three enableinputs (E1 and E2 and E3). Every output will be LOW unless E1 and E2 are LOW andE3 is HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32(5 to 32 lines) decoder with just four '238 ICs and one inverter. The '238 can be usedas an eight output demultiplexer by using one of the active LOW enable inputs as thedata input and the remaining enable inputs as strobes. Inputs include clamp diodes. Thisenables the use of current limiting resistors to interface inputs to voltages in excess ofV CC.2Features and benefits•Demultiplexing capability•Multiple input enable for easy expansion•Ideal for memory chip select decoding•Active HIGH mutually exclusive outputs•Multiple package options•Complies with JEDEC standard no. 7A•Input levels:–For 74HC238: CMOS level–For 74HCT238: TTL level•ESD protection:–HBM JESD22-A114F exceeds 2000 V–MM JESD22-A115-A exceeds 200 V•Specified from -40 °C to +85 °C and from -40 °C to +125 °C3Ordering information3-to-8 line decoder/demultiplexer4Functional diagram001aag7523 TO 8 DECODERENABLE EXITING A01A12A23E14E25E36Y015Y114Y213Y312Y411Y510Y69Y77Figure 1. Logic symbol 001aag7533 TO 8 DECODERENABLE EXITINGA01A12A23E14E25E36Y015Y114Y213Y312Y411Y510Y69Y77Figure 2. Functional diagram3-to-8 line decoder/demultiplexer 5Pinning information5.1Pinning5.2Pin description3-to-8 line decoder/demultiplexer 6Functional descriptionTable 3. Function tableH = HIGH voltage level; L = LOW voltage level; X = don’t care.7Limiting valuesTable 4. Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).[1]The input and output voltage ratings may be exceeded if the input and output current ratings are observed.[2]For SO16 package: above 70 °C the value of P tot derates linearly at 8 mW/K.For SSOP16 and TSSOP16 packages: above 60 °C the value of P tot derates linearly at 5.5 mW/K.For DHVQFN16 package: above 60 °C the value of P tot derates linearly at 4.5 mW/K.3-to-8 line decoder/demultiplexer 8Recommended operating conditionsTable 5. Recommended operating conditionsVoltages are referenced to GND (ground = 0 V).9Static characteristicsTable 6. Static characteristicsAt recommended operating conditions; voltages are referenced to GND (ground = 0 V).3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer 10Dynamic characteristicsTable 7. Dynamic characteristicsGND = 0 V; test circuit see Figure 8.3-to-8 line decoder/demultiplexer[1]t pd is the same as t PHL and t PLH.[2]t t is the same as t THL and t TLH.[3]C PD is used to determine the dynamic power dissipation (P D in μW):P D = C PD x V CC2 x f i x N + ∑ (C L x V CC2 x f o) where:f i = input frequency in MHz;f o = output frequency in MHz;C L = output load capacitance in pF;V CC = supply voltage in V;N = number of inputs switching;∑ (C L x V CC2 x f o) = sum of outputs.10.1Waveforms and test circuit3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer 11Package outline3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer3-to-8 line decoder/demultiplexer 12Abbreviations13Revision history3-to-8 line decoder/demultiplexer 14Legal information14.1 Data sheet status[1]Please consult the most recently issued document before initiating or completing a design.[2]The term 'short data sheet' is explained in section "Definitions".[3]The product status of device(s) described in this document may have changed since this document was published and may differ in case of multipledevices. The latest product status information is available on the Internet at URL .14.2 DefinitionsDraft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. Nexperia does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information.Short data sheet — A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local Nexperia sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail.Product specification — The information and data provided in a Product data sheet shall define the specification of the product as agreed between Nexperia and its customer, unless Nexperia and customer have explicitly agreed otherwise in writing. In no event however, shall an agreement be valid in which the Nexperia product is deemed to offer functions and qualities beyond those described in the Product data sheet.14.3 DisclaimersLimited warranty and liability — Information in this document is believed to be accurate and reliable. However, Nexperia does not give any representations or warranties, expressed or implied, as to the accuracyor completeness of such information and shall have no liability for the consequences of use of such information. Nexperia takes no responsibility for the content in this document if provided by an information source outside of Nexperia. In no event shall Nexperia be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation -lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Notwithstanding any damages that customer might incur for any reason whatsoever, Nexperia's aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of Nexperia.Right to make changes — Nexperia reserves the right to make changesto information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof.Suitability for use — Nexperia products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunctionof an Nexperia product can reasonably be expected to result in personal injury, death or severe property or environmental damage. Nexperia and its suppliers accept no liability for inclusion and/or use of Nexperia products in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk.Applications — Applications that are described herein for any of these products are for illustrative purposes only. Nexperia makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using Nexperia products, and Nexperia accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the Nexperia product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. Nexperia does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customer(s). Customer is responsible for doing all necessary testing for the customer’s applications and products using Nexperia products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). Nexperia does not accept any liability in this respect.Limiting values — Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above thosegiven in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device.Terms and conditions of commercial sale — Nexperia products aresold subject to the general terms and conditions of commercial sale, as published at /profile/terms, unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. Nexperia hereby expressly objects to applying the customer’s general terms and conditions with regard to the purchase of Nexperia products by customer.No offer to sell or license — Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance orthe grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights.Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities.3-to-8 line decoder/demultiplexerNon-automotive qualified products — Unless this data sheet expressly states that this specific Nexperia product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. Nexperia accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without Nexperia's warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond Nexperia's specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies Nexperia for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond Nexperia's standard warranty and Nexperia's product specifications.Translations — A non-English (translated) version of a document is for reference only. The English version shall prevail in case of any discrepancy between the translated and English versions.14.4 TrademarksNotice: All referenced brands, product names, service names and trademarks are the property of their respective owners.3-to-8 line decoder/demultiplexerContents1General description (1)2Features and benefits (1)3Ordering information (1)4Functional diagram (2)5Pinning information (3)5.1Pinning (3)5.2Pin description (3)6Functional description (4)7Limiting values (4)8Recommended operating conditions (5)9Static characteristics (5)10Dynamic characteristics (7)10.1Waveforms and test circuit (8)11Package outline (11)12Abbreviations (15)13Revision history (15)14Legal information (16)Please be aware that important notices concerning this document and the product(s)described herein, have been included in section 'Legal information'.Mouser ElectronicsAuthorized DistributorClick to View Pricing, Inventory, Delivery & Lifecycle Information:N experia:74HC238BQ,11574HC238D,65274HC238DB,11274HC238DB,11874HC238D,65374HC238N,65274HC238PW,11274HC238PW,11874HCT238BQ,11574HCT238D,65274HCT238DB,11274HCT238DB,118 74HCT238D,65374HCT238N,65274HCT238PW,11274HCT238PW,118。

单片机并口下载线的原理与调试

这就是下载线不稳定的表现．首先检查电路有无错焊、漏焊、短路现象，其次是连接件是否接触不良．
＿４下慧线的谭试和故障检惨－一－
调试下载线时．首先要保证目标板上的单片机可
最后的原因是电缆太长。
般制作下载线时都是把缓
冲芯片装在并１：３插头的壳内．而连线是在缓冲芯片和
以正常运行。也可以不断开六针插头和单片机目标板
５、保存设置。
－２．并Ⅱ镪橙飘一三｜｜｜Ｉ薯Ｉ薯２三Ｉ｜
设置好了并行接口并不能保证并行接１３一定能用．最好对并行接１：３进行一下检测。有个并口调试软件对检测并口是个很好的帮助．如图３。分别在上面输出框的１—９、１４、１６、１７脚前点上勾。并用万用表测量对应的并口脚．当勾上时为高电平（５Ｖｌ，去掉勾为低电平（０ｖ１．就说明并行接１：３
ቤተ መጻሕፍቲ ባይዱ
出端，Ｄ０～Ｄ７为数据输＾端。当三态输出允许控制端０Ｅ为高电平时．Ｑ０～Ｑ７呈高阻状态．即不能驱动总线．也不作为总线的负载，但锁存器内部的逻辑操作不受影响。当ＯＥ为低电平时．Ｑ０～Ｑ７为正常逻辑状态．
可用来驱动负载或总线。此时．当锁存允许端ＬＥ为高电平时，０随数据Ｄ而变。当ＬＥ为低电平时．０就被
指在用户设计的目标系统中或印刷电路板上配置的是空白器件．对空白器件写人用户代码进行编程或反复编程时．不需要把器件离开目标板插＾编程器单独编程，而是通过ＳＰ［等接１：３．接收上位机传来的数据．并对单片机内部的Ｆｌａｓｈ存储器进行编程。因为在设计目标板的时候就将接口设计在上面，所以叫“在系统编程”。这个功能的优势在于编程时仅需一个非常简单的转换电路和一条导线就可以把单片机和上位机连在一
－１
７４
７４ＬＳ３７３＂Ｆ巍钱量。＝…囊一≥曼矗兰

74hc240引脚图应用电路与pdf中文资料

74hc240引脚图应用电路与pdf中文资料74HC240是一款常见的驱动信号芯片，常用于各种单片机mcu系统中，单片机io口输出的电流很小而240芯片就是用来放大电流并且反相输出，74hc240的pdf资料下载：/f/74hc244.pdf74HC240是双线八路反相缓冲器/线路驱动器，具有三态输出。

该三态输出由输出使能端1OE和2OE控制。

任意nOE 上的高电平将使输出端呈现高阻态。

74HC240与74HC244逻辑功能相似，只不过74HC240带有反相输出。

74hc245具有双向的功能详细资料见:/chip/3507.html74HC240是CMOS电路，74ls240是双极晶体管型电路，二者的特性差别很大，LS器件是淘汰型，尽量不要选用。

74HC240，74HC241，74HC244为同一系列的产品，他们的区别很小在引脚及其功能方面下面的中文资料中都有详细的说明.74hc240与74hc244,74hc241的管脚图对比可以看出他们的功能是十分接近，其中240多一个反相的功能dip封装的74hc240引脚图贴片74hc240引脚图74hc240封装图74hc240真值表74hc244及74hc241 74hc240功能表我们可以看到240具有反相输出的功能.74hc240应用电路图74HC240 特性反相三态输出可选多种封装类型兼容JEDEC标准no.7AESD保护HBM EIA/JESD22-A114-D超过2000 VMM EIA/JESD22-A115-A超过200 V温度范围-40～+85 ℃-40～+125 ℃74hc244电流最大值74hc244电压温度等操作条件DC Electrical Specifications直流电气规格：Parameter 参数Symbol 符号TEST Conditions 测试条件25℃-40℃TO85℃-55℃TO125℃UNIT 单位VI (V)IO (mA)VCC (V)最小典型最大最小最大最小最大High Level Input V oltage输入高电平电压VIH--21.5--1.5-1.5-V4.53.15--3.15-3.15-V64.2--4.2-4.2-VLOW Level Input V oltage 输入低电平电压VIL--2--0.5-0.5-0.5V4.5--1.35-1.35-1.35V6--1.8-1.8-1.8VHIG H Level Output V oltage输出高电平电压CMOS负载VOHVIH or VIL-0.0221.9--1.9-1.9-V-0.024.54.4--4.4-4.4-V-0.0265.9--5.9-5.9-VHIGH Level Output V oltage输出高电平电压TTL负载-64.53.98--3.84-3.7-V-7.865.48--5.34-5.2-VLow Level Output V oltage 输出低电平电压CMOS负载VOLVIH orVIL0.022--0.1-0.1-0.1V0.024.5--0.1-0.1-0.1V0.026--0.1-0.1-0.1 VLow Level Output V oltage输出低电平电压TTL负载64.5--0.26-0.33-0.4V7.86--0.26-0.33-0.4VInput Leakage Current输入漏电流IIVCC or GND-6--±0.1-±1-±1μAQuiescent Device Current静态电流ICCVCC orGND06--8-80-160μA。

AiP74HC244中文资料

新制/修订内容
新制
江苏省无锡市蠡园经济开发区滴翠路 100 号 9 栋 2 层
http://www.i-core. cn
邮编：214072
第 1 页共 12 页版本：2012-02-A1
表 733-11-I
无锡中微爱芯电子有限公司
Wuxi I-CORE Electronics Co., Ltd. 编号：AiP74HC244-AX-BJs Co., Ltd. 编号：AiP74HC244-AX-BJ-168
3、电特性
3.1、极限参数（符合 IEC 60134 标准， GND=0）
参数名称
符号
条件
最小最大单位
电源电压
VCC
-0.5
+7.0
V
输入钳位电流
Ilk
VI<-0.5V orVI>Vcc+0.5V
最小 1.5 3.15 4.2 －－－ 1.9 4.4 5.9 3.84 5.34 －－－－
典型－－－－－－－－－－－－－－－
最大－－－ 0.5 1.35 1.8 －－－－－ 0.1 0.1 0.1 0.33
单位 V V V V V V V V V V V V V V V
2.3、引脚说明
引脚符号
1
1 OE
2
1A0
3
2Y0
4
1A1
5
2Y2
6
1A2
7
2Y2
8
1A3
9
2Y3
10
GND
2.4、真值表控制
n OE
L
i-core 图2、引脚排列图

HD74LS240P中文资料

HD74LS240Octal Buffers / Line Drivers / Line Receivers(inverted three-state outputs)REJ03D0459–0200Rev.2.00Feb.18.2005 Features• Ordering InformationPart Name Package Type Package Code(Previous Code)PackageAbbreviationTaping Abbreviation(Quantity)HD74LS240P DILP-20pin PRDP0020AC-B(DP-20NEV)P —HD74LS240FPEL SOP-20 pin (JEITA) PRSP0020DD-B(FP-20DAV)FP EL (2,000 pcs/reel)HD74LS240RPEL SOP-20 pin (JEDEC) PRSP0020DC-A(FP-20DBV)RP EL (1,000 pcs/reel)Note: Please consult the sales office for the above package availability. Pin ArrangementFunction TableInputs OutputG A YH X ZL H LL L HNote: H; high level, L; low level, X; irrelevant, Z; off (high-impedance) state of a 3-state outputBlock Diagram (1/2)Absolute Maximum RatingsUnitRatingsItem SymbolSupply voltage V CC 7 VInput voltage V IN 7 VPower dissipation P T 400 mWStorage temperature Tstg –65 to +150 °CNote: Voltage value, unless otherwise noted, are with respect to network ground terminal.Recommended Operating ConditionsMaxUnitMinItem SymbolTypSupply voltage V CC 4.75 5.00 5.25 VI OH — — –15 mAOutput currentI OL — — 24 mA°C75Operating temperature Topr–2025Electrical Characteristics(Ta = –20 to +75 °C)ItemSymbol min. typ.* max. Unit Condition V IH 2.0 — — VInput voltageV IL — — 0.8 V Hysteresis V T + – V T –0.2 0.4 — V V CC = 4.75 V2.4 — — V IL = 0.8 V, I OH = – 3 mA V OH 2.0 — — VV IL = 0.5 V, I OH = – 15 mA V CC = 4.75V, V IH = 2 V— — 0.4 I OL = 12 mA Output voltageV OL — — 0.5 VI OL = 24 mA V CC = 4.75 V, V IH = 2 V,V IL = 0.8 V I OZH — — 20 µA V O = 2.7 V Off-state output currentI OZL — — –20 µA V O = 0.4 VV CC = 5.25 V, V IH = 2 V, V IL = 0.8 V I IH — — 20 µA V CC = 5.25 V, V I = 2.7 V I IL — — –0.2 mA V CC = 5.25 V, V I = 0.4 VInput current I I —— 0.1 mA V CC = 5.25 V, V I = 7 V Short-circuit outputcurrentI OS –40— –225 mA V CC = 5.25 V Outputs high— 13 23Outputs low— 26 44Supply current**All outputsdisabledI CC— 29 50mA V CC = 5.25 V Input clamp voltage V IK — — –1.5 V V CC = 4.75 V, I IN = –18 mA Notes: * V CC = 5 V, Ta = 25°C ** I CC is measured with all outputs open.Switching Characteristics(V CC = 5 V, Ta = 25°C)Item Symbol min. typ. max. Unit Conditiont PLH — 9 14Propagation delay time t PHL — 12 18nst ZL — 20 30 nsOutput enable timet ZH — 15 23 ns C L = 45 pF, R L = 667 Ωt LZ — 15 25 nsOutput disable time t HZ — 10 18 ns C L = 5 pF, R L = 667 ΩNote: Refer to Test Circuit and Waveform of the Common Item "TTL Common Matter (Document No.: REJ27D0005-0100)".Package Dimensions RENESAS SALES OFFICESRefer to "/en/network" for the latest and detailed information.Renesas Technology America, Inc.450 Holger Way, San Jose, CA 95134-1368, U.S.ATel: <1> (408) 382-7500, Fax: <1> (408) 382-7501Renesas Technology Europe LimitedDukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, U.K.Tel: <44> (1628) 585-100, Fax: <44> (1628) 585-900Renesas Technology Hong Kong Ltd.7th Floor, North Tower, World Finance Centre, Harbour City, 1 Canton Road, Tsimshatsui, Kowloon, Hong KongTel: <852> 2265-6688, Fax: <852> 2730-6071Renesas Technology Taiwan Co., Ltd.10th Floor, No.99, Fushing North Road, Taipei, TaiwanTel: <886> (2) 2715-2888, Fax: <886> (2) 2713-2999Renesas Technology (Shanghai) Co., Ltd.Unit2607 Ruijing Building, No.205 Maoming Road (S), Shanghai 200020, ChinaTel: <86> (21) 6472-1001, Fax: <86> (21) 6415-2952Renesas Technology Singapore Pte. Ltd.1 Harbour Front Avenue, #06-10, Keppel Bay Tower, Singapore 098632Tel: <65> 6213-0200, Fax: <65> 6278-8001。

protel_99SE_各元件搜索名称

名称英文名元件库封装封装库电阻 RES AXIAL0.1-1.0无极电容 CAP RAD 0.1-0.4电解电容 ELECTRO RB 0.2/0.4-0.5/1.0二极管 DIODE DIODE0.1-0.7全桥 BRIDGE D-44 D-37 D-46电位器 POT VR-1 VR-5三极管 NPN PNP TO-18 TO-22TO-3 (达林顿) 集成块 PID PID-8 -40晶体振荡器 XTAL1AND 与门ANTENNA 天线BATTERY 直流电源BELL 铃,钟BVC 同轴电缆接插件BRIDEG 1 整流桥(二极管)BRIDEG 2 整流桥(集成块)BUFFER 缓冲器BUZZER 蜂鸣器CAP 电容CAPACITOR 电容CAPACITOR POL 有极性电容CAPVAR 可调电容CIRCUIT BREAKER 熔断丝COAX 同轴电缆CON 插口CRYSTAL 晶体整荡器DB 并行插口DIODE 二极管DIODE SCHOTTKY 稳压二极管DIODE VARACTOR 变容二极管DPY_3-SEG 3段LEDDPY_7-SEG 7段LEDDPY_7-SEG_DP 7段LED(带小数点)ELECTRO 电解电容FUSE 熔断器INDUCTOR 电感INDUCTOR IRON 带铁芯电感INDUCTOR3 可调电感JFET N N沟道场效应管JFET P P沟道场效应管LAMP 灯泡LAMP NEDN 起辉器LED 发光二极管METER 仪表MICROPHONE 麦克风MOSFET MOS管MOTOR AC 交流电机MOTOR SERVO 伺服电机NAND 与非门NOR 或非门NOT 非门NPN NPN三极管NPN-PHOTO 感光三极管OPAMP 运放OR 或门PHOTO 感光二极管PNP 三极管NPN DAR NPN三极管PNP DAR PNP三极管POT 滑线变阻器PELAY-DPDT 双刀双掷继电器RES1.2 电阻RES3.4 可变电阻RESISTOR BRIDGE ? 桥式电阻RESPACK ? 电阻SCR 晶闸管PLUG ? 插头PLUG AC FEMALE 三相交流插头SOCKET ? 插座SOURCE CURRENT 电流源SOURCE VOLTAGE 电压源SPEAKER 扬声器SW ? 开关SW-DPDY ? 双刀双掷开关SW-SPST ? 单刀单掷开关SW-PB 按钮THERMISTOR 电热调节器TRANS1 变压器TRANS2 可调变压器TRIAC 三端双向可控硅TRIODE 三极真空管VARISTOR 变阻器ZENER 齐纳二极管DPY_7-SEG_DP 数码管SW-PB 开关4013 D 触发器4027 JK 触发器Protel Dos Schematic Analog Digital.Lib 模拟数字式集成块元件库AD系列 DAC系列 HD系列 MC系列Protel Dos Schematic Comparator.Lib 比较放大器元件库Protel Dos Shcematic Intel.Lib INTEL公司生产的80系列CPU集成块元件库Protel Dos Schematic Linear.lib 线性元件库Protel Dos Schemattic Memory Devices.Lib 内存存储器元件库Protel Dos Schematic SYnertek.Lib SY系列集成块元件库Protes Dos Schematic Motorlla.Lib 摩托罗拉公司生产2楼 wws 发表于：2007-9-4 23:57:13型号功能封装AND与门ANTNNA天线BATTERY电池BELL电铃BNC高频线接插器BUFFER缓冲器BUZZER蜂鸣器COAXPAIR带屏蔽的电缆进线器FUSE1熔断器FUSE2熔断丝GND 地LAMP 电灯METE 表头MICROPHONE 麦克风(话筒)NAND 与非门NEON 氖灯NOR 或非门NOT 非门OPAMP 运算放大器OR 或门PHONEJACKl 耳机插座PHONEJACK2 耳机插座PHONEPLUGl 耳机插头PHONEPLUG2 耳机插头PHONEPLUG3 耳机插头PLUG 电气插头PLUGSOCKET 电气插头RCA 高频线接插器RELAY-SPST 单刀单掷开关继电器RELAY-SPDT 单刀双掷开关继电器RELAY-DPST 双刀单双掷开关继电器RELAY-DPDT 双刀双掷开关继电器SOCKET 电气插座SPEAKER 扬声器SW-SPS 单刀单掷开关SW-SPDT 单刀双掷开关SW-DPST 双刀单掷开关SW-DPDT 双刀双掷开关SW-PB 按键开关SW-6WAY 六路旋钮转换开关SW—12WAY 十二路旋钮转换开关SW-DIP4 双列直插封装四路开关 DIP8SW-DIP8 双列直插封装八路开关 DIPl6VOLTREG 电压变换器TO-220XNOR 异或非门XOR 异或门GND 地VCC 电压螈VDD 电压塬VSS 电压源BRIDGEl 二极管整流电桥BRIDGE2 内封装二极管整电桥BRIDGEDIODE 极管JFET-N N沟道结型场效应管JFET-PLED 发光二极管MOSFET-N1 N沟道金属氧化物半导体场效应管MOSFET-N2 双栅型N沟道金属氧化物半导体场效应管MOSFET-N3 增强型N沟道金属氧化物半导体效应管MOSFET-N4 耗尽型N沟道金属氧化物半导体场效应管MOSFET-PI P沟道金属氧化物半导体场效应管MOSFET-P2 双栅型P沟道金属氧化物半导体场效应管MOSFET-P3 增强型P沟道金属氧化物半导体场效应管MOSFET-P4 耗尽型P沟道金属氧化物半导体场效应管NPN NPN型晶体三极管N-PHOTO NPN型光敏三极管OPT01SO1 光电隔离开关(发光二极管+光敏二极管型) OPTOIS02 光电隔离开关(发光二极管+光敏三极管型) OPTOTRIAC 光电隔离开关(发光二极管+三端可控制硅型) PHOTO 光敏二极管PNP PNP型晶体三极管PNP-PHOTO PNP型光敏三极管SCR 可控硅整流器TRIAC 三端双向可控硅开关TUNNEL 隧道二极管UNLJUNC-N N型单结晶体管UNLJUNC-P P型单结晶体管ZENERI 齐纳二极管ZENER2 齐纳二极管ZENER3 齐纳二极管CAP 无级性电容器CAPVAR 无极性电容器CRYSTAL 石英晶体ELECTR01 有极性电容器ELECTRO2 有极性大电容器INDUCTORI 电感器(线圈)INDUCTOR2 带磁芯电感器(线圈)INDUCTOR3 可调电感器(线圈)INDUCIOR4 带磁芯可调电感器(线圈)POT1 可调电位器(用波浪线表示)POT2 可调电位器(用长矩形表示)RESl 电阻器(用波浪线表示)RES2 电阻器(用长矩形表示)RES3 可调电阻器(用波浪线表示)RES4 可调电阻器(用长矩形表示)RESPACKI 八单元内封装集成电阻器之一(用波浪线表示) DIPl6 RESPACK2 八单元内封装集成电阻器之一(用长矩形表示) DIPl6 RESPACK3 完整的八单元内封装集成电阻器之一(用波浪线表示)DIPl6 RESPACK4 完整的八单元内封装集成电阻器之一(用长矩形表示) DIPl6 TRANSI 带铁芯变压器TRANS2 带铁芯可调变压器TRANS3 不带铁芯可调变压器TRANS4 带铁芯三插头大变压器TRANS5 带铁芯三插头大变压器4PIN 4脚插座 FLY48PIN 8脚插座 IDC816PIN 16脚插座 IDCl620PIN 20脚插座 IDC2026PIN 26脚插座 IDC2634PIN 34脚插座 IDC3440PIN 40脚插座 IDC4050PIN 50脚插座 IDC50DB9 9芯插座 DB9DBl5 15芯插座 DBl5DB25 25芯插座 DB25DB37 37芯插座 DB37原理图常用库文件：Miscellaneous Devices.ddbDallas Microprocessor.ddbIntel Databooks.ddbProtel DOS Schematic Libraries.ddb PCB元件常用库：Advpcb.ddbGeneral IC.ddbMiscellaneous.ddb部分分立元件库元件名称及中英对照AND 与门ANTENNA 天线BATTERY 直流电源BELL 铃,钟BVC 同轴电缆接插件BRIDEG 1 整流桥(二极管)BRIDEG 2 整流桥(集成块)BUFFER 缓冲器BUZZER 蜂鸣器CAP 电容CAPACITOR 电容CAPACITOR POL 有极性电容CAPVAR 可调电容CIRCUIT BREAKER 熔断丝COAX 同轴电缆CON 插口CRYSTAL 晶体整荡器DB 并行插口DIODE 二极管DIODE SCHOTTKY 稳压二极管DIODE VARACTOR 变容二极管DPY_3-SEG 3段LEDDPY_7-SEG 7段LEDDPY_7-SEG_DP 7段LED(带小数点)ELECTRO 电解电容FUSE 熔断器INDUCTOR 电感INDUCTOR IRON 带铁芯电感INDUCTOR3 可调电感JFET N N沟道场效应管JFET P P沟道场效应管LAMP 灯泡LAMP NEDN 起辉器LED 发光二极管METER 仪表MICROPHONE 麦克风MOSFET MOS管MOTOR AC 交流电机MOTOR SERVO 伺服电机NAND 与非门NOR 或非门NOT 非门NPN NPN三极管NPN-PHOTO 感光三极管OPAMP 运放OR 或门PHOTO 感光二极管PNP 三极管NPN DAR NPN三极管PNP DAR PNP三极管POT 滑线变阻器PELAY-DPDT 双刀双掷继电器RES1.2 电阻RES3.4 可变电阻RESISTOR BRIDGE ? 桥式电阻RESPACK ? 电阻SCR 晶闸管PLUG ? 插头PLUG AC FEMALE 三相交流插头SOCKET ? 插座SOURCE CURRENT 电流源SOURCE VOLTAGE 电压源SPEAKER 扬声器SW ? 开关SW-DPDY ? 双刀双掷开关SW-SPST ? 单刀单掷开关SW-PB 按钮THERMISTOR 电热调节器TRANS1 变压器TRANS2 可调变压器TRIAC ? 三端双向可控硅TRIODE ? 三极真空管VARISTOR 变阻器ZENER ? 齐纳二极管DPY_7-SEG_DP 数码管SW-PB 开关74系列：74LS00 TTL 2输入端四与非门74LS01 TTL 集电极开路2输入端四与非门74LS02 TTL 2输入端四或非门74LS03 TTL 集电极开路2输入端四与非门74LS122 TTL 可再触发单稳态多谐振荡器74LS123 TTL 双可再触发单稳态多谐振荡器74LS125 TTL 三态输出高有效四总线缓冲门74LS126 TTL 三态输出低有效四总线缓冲门74LS13 TTL 4输入端双与非施密特触发器74LS132 TTL 2输入端四与非施密特触发器74LS133 TTL 13输入端与非门74LS136 TTL 四异或门74LS138 TTL 3-8线译码器/复工器74LS139 TTL 双2-4线译码器/复工器74LS14 TTL 六反相施密特触发器74LS145 TTL BCD—十进制译码/驱动器74LS15 TTL 开路输出3输入端三与门74LS150 TTL 16选1数据选择/多路开关74LS151 TTL 8选1数据选择器74LS153 TTL 双4选1数据选择器74LS154 TTL 4线—16线译码器74LS155 TTL 图腾柱输出译码器/分配器74LS156 TTL 开路输出译码器/分配器74LS157 TTL 同相输出四2选1数据选择器74LS158 TTL 反相输出四2选1数据选择器74LS16 TTL 开路输出六反相缓冲/驱动器74LS160 TTL 可预置BCD异步清除计数器74LS161 TTL 可予制四位二进制异步清除计数器74LS162 TTL 可预置BCD同步清除计数器74LS163 TTL 可予制四位二进制同步清除计数器74LS164 TTL 八位串行入/并行输出移位寄存器74LS165 TTL 八位并行入/串行输出移位寄存器74LS166 TTL 八位并入/串出移位寄存器74LS169 TTL 二进制四位加/减同步计数器74LS17 TTL 开路输出六同相缓冲/驱动器74LS170 TTL 开路输出4×4寄存器堆74LS173 TTL 三态输出四位D型寄存器74LS174 TTL 带公共时钟和复位六D触发器74LS175 TTL 带公共时钟和复位四D触发器74LS180 TTL 9位奇数/偶数发生器/校验器74LS181 TTL 算术逻辑单元/函数发生器74LS185 TTL 二进制—BCD代码转换器74LS190 TTL BCD同步加/减计数器74LS191 TTL 二进制同步可逆计数器74LS192 TTL 可预置BCD双时钟可逆计数器74LS193 TTL 可预置四位二进制双时钟可逆计数器74LS194 TTL 四位双向通用移位寄存器74LS195 TTL 四位并行通道移位寄存器74LS196 TTL 十进制/二-十进制可预置计数锁存器74LS197 TTL 二进制可预置锁存器/计数器74LS20 TTL 4输入端双与非门74LS21 TTL 4输入端双与门74LS22 TTL 开路输出4输入端双与非门74LS221 TTL 双/单稳态多谐振荡器74LS240 TTL 八反相三态缓冲器/线驱动器74LS241 TTL 八同相三态缓冲器/线驱动器74LS243 TTL 四同相三态总线收发器74LS244 TTL 八同相三态缓冲器/线驱动器74LS245 TTL 八同相三态总线收发器74LS247 TTL BCD—7段15V输出译码/驱动器74LS248 TTL BCD—7段译码/升压输出驱动器74LS249 TTL BCD—7段译码/开路输出驱动器74LS251 TTL 三态输出8选1数据选择器/复工器74LS253 TTL 三态输出双4选1数据选择器/复工器74LS256 TTL 双四位可寻址锁存器74LS257 TTL 三态原码四2选1数据选择器/复工器74LS258 TTL 三态反码四2选1数据选择器/复工器74LS259 TTL 八位可寻址锁存器/3-8线译码器74LS26 TTL 2输入端高压接口四与非门74LS260 TTL 5输入端双或非门74LS266 TTL 2输入端四异或非门74LS27 TTL 3输入端三或非门74LS273 TTL 带公共时钟复位八D触发器74LS279 TTL 四图腾柱输出S-R锁存器74LS28 TTL 2输入端四或非门缓冲器74LS283 TTL 4位二进制全加器74LS290 TTL 二/五分频十进制计数器74LS293 TTL 二/八分频四位二进制计数器74LS295 TTL 四位双向通用移位寄存器74LS298 TTL 四2输入多路带存贮开关74LS299 TTL 三态输出八位通用移位寄存器74LS30 TTL 8输入端与非门74LS32 TTL 2输入端四或门74LS322 TTL 带符号扩展端八位移位寄存器74LS323 TTL 三态输出八位双向移位/存贮寄存器74LS33 TTL 开路输出2输入端四或非缓冲器74LS347 TTL BCD—7段译码器/驱动器74LS352 TTL 双4选1数据选择器/复工器74LS353 TTL 三态输出双4选1数据选择器/复工器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS366 TTL 门使能输入三态输出六反相线驱动器74LS367 TTL 4/2线使能输入三态六同相线驱动器74LS368 TTL 4/2线使能输入三态六反相线驱动器74LS37 TTL 开路输出2输入端四与非缓冲器74LS373 TTL 三态同相八D锁存器74LS374 TTL 三态反相八D锁存器74LS375 TTL 4位双稳态锁存器74LS377 TTL 单边输出公共使能八D锁存器74LS378 TTL 单边输出公共使能六D锁存器74LS379 TTL 双边输出公共使能四D锁存器74LS38 TTL 开路输出2输入端四与非缓冲器74LS380 TTL 多功能八进制寄存器74LS39 TTL 开路输出2输入端四与非缓冲器74LS390 TTL 双十进制计数器74LS393 TTL 双四位二进制计数器74LS40 TTL 4输入端双与非缓冲器74LS42 TTL BCD—十进制代码转换器74LS352 TTL 双4选1数据选择器/复工器74LS353 TTL 三态输出双4选1数据选择器/复工器74LS365 TTL 门使能输入三态输出六同相线驱动器74LS366 TTL 门使能输入三态输出六反相线驱动器74LS367 TTL 4/2线使能输入三态六同相线驱动器74LS368 TTL 4/2线使能输入三态六反相线驱动器74LS37 TTL 开路输出2输入端四与非缓冲器74LS373 TTL 三态同相八D锁存器74LS374 TTL 三态反相八D锁存器74LS375 TTL 4位双稳态锁存器74LS377 TTL 单边输出公共使能八D锁存器74LS378 TTL 单边输出公共使能六D锁存器74LS379 TTL 双边输出公共使能四D锁存器74LS38 TTL 开路输出2输入端四与非缓冲器74LS380 TTL 多功能八进制寄存器74LS39 TTL 开路输出2输入端四与非缓冲器74LS390 TTL 双十进制计数器74LS393 TTL 双四位二进制计数器74LS40 TTL 4输入端双与非缓冲器74LS42 TTL BCD—十进制代码转换器74LS447 TTL BCD—7段译码器/驱动器74LS45 TTL BCD—十进制代码转换/驱动器74LS450 TTL 16:1多路转接复用器多工器74LS451 TTL 双8:1多路转接复用器多工器74LS453 TTL 四4:1多路转接复用器多工器74LS46 TTL BCD—7段低有效译码/驱动器74LS460 TTL 十位比较器74LS461 TTL 八进制计数器74LS465 TTL 三态同相2与使能端八总线缓冲器74LS466 TTL 三态反相2与使能八总线缓冲器74LS467 TTL 三态同相2使能端八总线缓冲器74LS468 TTL 三态反相2使能端八总线缓冲器74LS469 TTL 八位双向计数器74LS47 TTL BCD—7段高有效译码/驱动器74LS48 TTL BCD—7段译码器/内部上拉输出驱动74LS490 TTL 双十进制计数器74LS491 TTL 十位计数器74LS498 TTL 八进制移位寄存器74LS50 TTL 2-3/2-2输入端双与或非门74LS502 TTL 八位逐次逼近寄存器74LS503 TTL 八位逐次逼近寄存器74LS51 TTL 2-3/2-2输入端双与或非门74LS533 TTL 三态反相八D锁存器74LS534 TTL 三态反相八D锁存器74LS54 TTL 四路输入与或非门74LS540 TTL 八位三态反相输出总线缓冲器74LS55 TTL 4输入端二路输入与或非门74LS563 TTL 八位三态反相输出触发器74LS564 TTL 八位三态反相输出D触发器74LS573 TTL 八位三态输出触发器74LS574 TTL 八位三态输出D触发器74LS645 TTL 三态输出八同相总线传送接收器74LS670 TTL 三态输出4×4寄存器堆74LS73 TTL 带清除负触发双J-K触发器74LS74 TTL 带置位复位正触发双D触发器74LS76 TTL 带预置清除双J-K触发器74LS83 TTL 四位二进制快速进位全加器74LS85 TTL 四位数字比较器74LS86 TTL 2输入端四异或门74LS90 TTL 可二/五分频十进制计数器74LS93 TTL 可二/八分频二进制计数器74LS95 TTL 四位并行输入\\输出移位寄存器74LS97 TTL 6位同步二进制乘法器CD系列：：CD4000 双3输入端或非门+单非门 TICD4001 四2输入端或非门 HIT/NSC/TI/GOLCD4002 双4输入端或非门 NSCCD4006 18位串入/串出移位寄存器 NSCCD4007 双互补对加反相器 NSCCD4008 4位超前进位全加器 NSCCD4009 六反相缓冲/变换器 NSCCD4010 六同相缓冲/变换器 NSCCD4011 四2输入端与非门 HIT/TICD4012 双4输入端与非门 NSCCD4013 双主-从D型触发器 FSC/NSC/TOSCD4014 8位串入/并入-串出移位寄存器 NSCCD4015 双4位串入/并出移位寄存器 TICD4016 四传输门 FSC/TICD4017 十进制计数/分配器 FSC/TI/MOTCD4018 可预制1/N计数器 NSC/MOTCD4019 四与或选择器 PHICD4020 14级串行二进制计数/分频器 FSCCD4021 08位串入/并入-串出移位寄存器 PHI/NSC CD4022 八进制计数/分配器 NSC/MOTCD4023 三3输入端与非门 NSC/MOT/TICD4024 7级二进制串行计数/分频器 NSC/MOT/TICD4025 三3输入端或非门 NSC/MOT/TICD4026 十进制计数/7段译码器 NSC/MOT/TICD4027 双J-K触发器 NSC/MOT/TICD4028 BCD码十进制译码器 NSC/MOT/TICD4029 可预置可逆计数器 NSC/MOT/TICD4030 四异或门 NSC/MOT/TI/GOLCD4031 64位串入/串出移位存储器 NSC/MOT/TICD4032 三串行加法器 NSC/TICD4033 十进制计数/7段译码器 NSC/TICD4034 8位通用总线寄存器 NSC/MOT/TICD4035 4位并入/串入-并出/串出移位寄存 NSC/MOT/TI CD4038 三串行加法器 NSC/TICD4040 12级二进制串行计数/分频器 NSC/MOT/TICD4041 四同相/反相缓冲器 NSC/MOT/TICD4042 四锁存D型触发器 NSC/MOT/TICD4043 4三态R-S锁存触发器("1"触发) NSC/MOT/TI CD4044 四三态R-S锁存触发器("0"触发) NSC/MOT/TI CD4046 锁相环 NSC/MOT/TI/PHICD4047 无稳态/单稳态多谐振荡器 NSC/MOT/TICD4048 4输入端可扩展多功能门 NSC/HIT/TICD4049 六反相缓冲/变换器 NSC/HIT/TICD4050 六同相缓冲/变换器 NSC/MOT/TICD4051 八选一模拟开关 NSC/MOT/TICD4052 双4选1模拟开关 NSC/MOT/TICD4053 三组二路模拟开关 NSC/MOT/TICD4054 液晶显示驱动器 NSC/HIT/TICD4055 BCD-7段译码/液晶驱动器 NSC/HIT/TICD4056 液晶显示驱动器 NSC/HIT/TICD4059 “N”分频计数器 NSC/TICD4060 14级二进制串行计数/分频器 NSC/TI/MOTCD4063 四位数字比较器 NSC/HIT/TICD4066 四传输门 NSC/TI/MOTCD4067 16选1模拟开关 NSC/TICD4068 八输入端与非门/与门 NSC/HIT/TICD4069 六反相器 NSC/HIT/TICD4070 四异或门 NSC/HIT/TICD4071 四2输入端或门 NSC/TICD4072 双4输入端或门 NSC/TICD4073 三3输入端与门 NSC/TICD4075 三3输入端或门 NSC/TICD4076 四D寄存器CD4077 四2输入端异或非门 HITCD4078 8输入端或非门/或门CD4081 四2输入端与门 NSC/HIT/TICD4082 双4输入端与门 NSC/HIT/TICD4085 双2路2输入端与或非门CD4086 四2输入端可扩展与或非门CD4089 二进制比例乘法器CD4093 四2输入端施密特触发器 NSC/MOT/STCD4094 8位移位存储总线寄存器 NSC/TI/PHICD4095 3输入端J-K触发器CD4096 3输入端J-K触发器CD4097 双路八选一模拟开关CD4098 双单稳态触发器 NSC/MOT/TICD4099 8位可寻址锁存器 NSC/MOT/STCD40100 32位左/右移位寄存器CD40101 9位奇偶较验器CD40102 8位可预置同步BCD减法计数器CD40103 8位可预置同步二进制减法计数器CD40104 4位双向移位寄存器CD40105 先入先出FI-FD寄存器CD40106 六施密特触发器 NSC\\TICD40107 双2输入端与非缓冲/驱动器 HAR\\TICD40108 4字×4位多通道寄存器CD40109 四低-高电平位移器CD4529 双四路/单八路模拟开关CD4530 双5输入端优势逻辑门CD4531 12位奇偶校验器CD4532 8位优先编码器CD4536 可编程定时器CD4538 精密双单稳CD4539 双四路数据选择器CD4541 可编程序振荡/***CD4543 BCD七段锁存译码,驱动器CD4544 BCD七段锁存译码,驱动器CD4547 BCD七段译码/大电流驱动器CD4549 函数近似寄存器CD4551 四2通道模拟开关CD4553 三位BCD计数器CD4555 双二进制四选一译码器/分离器CD4556 双二进制四选一译码器/分离器CD4558 BCD八段译码器CD4560 "N"BCD加法器CD4561 "9"求补器CD4573 四可编程运算放大器CD4574 四可编程电压比较器CD4575 双可编程运放/比较器CD4583 双施密特触发器CD4584 六施密特触发器CD4585 4位数值比较器CD4599 8位可寻址锁存器CD40110 十进制加/减,计数,锁存,译码驱动 STCD40147 10-4线编码器 NSC\\MOTCD40160 可预置BCD加计数器 NSC\\MOTCD40161 可预置4位二进制加计数器 NSC\\MOTCD40162 BCD加法计数器 NSC\\MOTCD40163 4位二进制同步计数器 NSC\\MOTCD40174 六锁存D型触发器 NSC\\TI\\MOTCD40175 四D型触发器 NSC\\TI\\MOTCD40181 4位算术逻辑单元/函数发生器CD40182 超前位发生器CD40192 可预置BCD加/减计数器(双时钟) NSC\\TI CD40193 可预置4位二进制加/减计数器 NSC\\TICD40194 4位并入/串入-并出/串出移位寄存 NSC\\MOTCD40195 4位并入/串入-并出/串出移位寄存 NSC\\MOTCD40208 4×4多端口寄存器型号器件名称厂牌备注CD4501 4输入端双与门及2输入端或非门CD4502 可选通三态输出六反相/缓冲器CD4503 六同相三态缓冲器CD4504 六电压转换器CD4506 双二组2输入可扩展或非门CD4508 双4位锁存D型触发器CD4510 可预置BCD码加/减计数器CD4511 BCD锁存,7段译码,驱动器CD4512 八路数据选择器CD4513 BCD锁存,7段译码,驱动器(消隐)CD4514 4位锁存,4线-16线译码器CD4515 4位锁存,4线-16线译码器CD4516 可预置4位二进制加/减计数器CD4517 双64位静态移位寄存器CD4518 双BCD同步加计数器CD4519 四位与或选择器CD4520 双4位二进制同步加计数器CD4521 24级分频器CD4522 可预置BCD同步1/N计数器CD4526 可预置4位二进制同步1/N计数器CD4527 BCD比例乘法器CD4528 双单稳态触发器注：同型号的74系列、74HC系列、74LS系列芯片，逻辑功能上是一样的。

74ls240工作原理

74ls240工作原理那让我来跟您唠唠 74LS240 这个芯片的工作原理。

74LS240 这家伙，就像是电路世界里的一个小能手！它主要是用来缓冲和驱动数据的。

您看哈，这 74LS240 有好多引脚呢。

这些引脚就像是它的小手小脚，各自有着重要的任务。

比如说，有的引脚负责输入信号，有的负责输出信号。

当有输入信号进来的时候，74LS240 就会精神抖擞地准备干活啦！它会把这个输入的信号好好处理一番。

它就像一个聪明的小管家，知道怎么把这个信号整理得更漂亮，更适合后面的电路使用。

它处理信号的过程，就像是在给信号做一次美容。

把那些不规整的、可能会捣乱的部分给修整好，让信号变得顺顺溜溜的。

而且啊，74LS240 还特别能吃苦耐劳。

不管输入的信号是强是弱，是快是慢，它都能稳稳地接住，然后认真处理。

在输出信号的时候呢，它也是尽职尽责。

保证输出的信号是清晰、准确、有力的，能够让后续的电路元件轻松接收到，不会出现什么误解或者错误。

比如说，如果后面的电路元件需要一个比较强的信号才能正常工作，74LS240 就会像大力士一样，把输出的信号增强，让后续的元件能够吃饱喝足，有力气干活。

要是后面的元件只能接受比较弱的信号，它也能贴心地把输出信号减弱，就像给信号减肥一样，让后续的元件能够舒舒服服地接收，不会被撑着。

74LS240 这个小家伙，虽然看起来不大起眼，但是在电路里可是发挥着大作用呢！它就像是电路世界里默默无闻的英雄，一直在那里勤勤恳恳地工作，为整个电路系统的正常运行贡献着自己的力量。

您说，它是不是很厉害呀？咱们再深入聊聊它的一些细节。

您知道吗？74LS240 对电源的要求也不算高，就像一个不挑食的好孩子。

只要给它提供合适的电压，它就能欢快地跑起来。

而且它在工作的时候，发热也不算厉害，不会像有些家伙，干一会儿活就热得不行。

这说明它的效率还是挺高的，不会浪费太多的能量。

还有哦，它和其他的电路元件配合起来也特别默契。

就像是一个团队里的好伙伴，大家一起齐心协力，共同完成复杂的电路任务。

74240 TTL 八反相三态缓冲器线驱动器

© 2000 Fairchild Semiconductor Corporation DS006411August 1986Revised March 2000DM74LS240 • DM74LS241 Octal 3-STATE Buffer/Line Driver/Line ReceiverDM74LS240 • DM74LS241Octal 3-STATE Buffer/Line Driver/Line ReceiverGeneral DescriptionThese buffers/line drivers are designed to improve both the performance and PC board density of 3-STATE buffers/drivers employed as memory-address drivers, clock driv-ers, and bus-oriented transmitters/receivers. Featuring 400mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133Ω.Featuress 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at data inputs improves noise margins s Typical I OL (sink current)24 mAs Typical I OH (source current)−15 mAs Typical propagation delay timesInverting 10.5 ns Noninverting12 nss Typical enable/disable time 18 ns s Typical power dissipation (enabled)Inverting 130 mW Noninverting135 mWOrdering Code:Devices also available in T ape and Reel. Specify by appending the suffix letter “X” to the ordering code.Connection DiagramsDM74LS240DM74LS241Order Number Package NumberPackage DescriptionDM74LS240WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74LS240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74LS241WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS241NN20A20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 2D M 74L S 240 • D M 74L S 241Function TablesDM74LS240DM74LS241L = LOW Logic Level H = HIGH Logic LevelX = Either LOW or HIGH Logic Level Z = High ImpedanceInputsOutput G A Y L L H L H L HXZInputs Outputs G G 1A 2A 1Y 2YX L L X L X L H X H X H X X ZH X X L L H X X H H LXXXZDM74LS240 • DM74LS241Absolute Maximum Ratings (Note 1)Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings.The “Recommended Operating Conditions” table will define the conditions for actual device operation.Recommended Operating ConditionsElectrical Characteristicsover recommended operating free air temperature range (unless otherwise noted)Note 2: All typicals are at V CC = 5V, T A = 25°C.Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.Supply Voltage 7V Input Voltage7VOperating Free Air Temperature Range 0°C to +70°C Storage Temperature Range−65°C to +150°CSymbol ParameterMin Nom Max Units V CC Supply Voltage4.7555.25V V IH HIGH Level Input Voltage 2V V IL LOW Level Input Voltage 0.8V I OH HIGH Level Output Current −15mA I OL LOW Level Output Current 24mA T AFree Air Operating Temperature70°CSymbol ParameterConditions MinTyp Max Units (Note 2)V I Input Clamp Voltage V CC = Min, I I = −18 mA −1.5V HYS Hysteresis (V T + − V T −)V CC = Min0.20.4VData Inputs OnlyV OHHIGH Level Output VoltageV CC = Min, V IH = Min 2.7V IL = Max, I OH = −1 mA V CC = Min, V IH = Min 2.4 3.4VV IL = Max, I OH = −3 mA V CC = Min, V IH = Min 2V IL = 0.5V, I OH = MaxV OLLOW Level Output VoltageV CC = Min I OL = 12 mA 0.4V IL = Max I OL = Max 0.5VV IH = MinI OZH Off-State Output Current,V CC = Max V O = 2.7V 20µA HIGH Level Voltage Applied V IL = Max I OZL Off-State Output Current,V IH = MinV O = 0.4V−20µA LOW Level Voltage Applied I I Input Current at Maximum V CC = Max 0.1mA Input VoltageV I = 7VI IH HIGH Level Input Current V CC = Max, V I = 2.7V 20µA I IL LOW Level Input Current V CC = Max, V I = 0.4V −0.2mA I OS Short Circuit Output Current V CC = Max (Note 3)−40−225mAI CCSupply CurrentV CC = Max,Outputs HIGH 1323Outputs OPENOutputs LOW 26442746mA Outputs Disabled29503254 4D M 74L S 240 • D M 74L S 241Switching Characteristicsat V CC = 5V and T A = 25°C Symbol ParameterConditionsMax Units t PLH Propagation Delay Time C L = 45 pF DM74LS24014ns LOW-to-HIGH Level Output R L = 667ΩDM74LS24118t PHL Propagation Delay Time C L = 45 pF DM74LS24018ns HIGH-to-LOW Level Output R L = 667ΩDM74LS24118t PZL Output Enable Time C L = 45 pF DM74LS24030ns to LOW Level R L = 667ΩDM74LS24130t PZH Output Enable Time C L = 45 pF DM74LS24023ns to HIGH Level R L = 667ΩDM74LS24123t PLZ Output Disable Time C L = 5 pF DM74LS24025ns from LOW Level R L = 667ΩDM74LS24125t PHZ Output Disable Time C L = 5 pF DM74LS24018ns from HIGH Level R L = 667ΩDM74LS24118t PLH Propagation Delay Time C L = 150 pF DM74LS24018ns LOW-to-HIGH Level Output R L = 667ΩDM74LS24121t PHL Propagation Delay Time C L = 150 pF DM74LS24022ns HIGH-to-LOW Level Output R L = 667ΩDM74LS24122t PZL Output Enable Time C L = 150 pF DM74LS24033ns to LOW Level R L = 667ΩDM74LS24133t PZHOutput Enable Time C L = 150 pF DM74LS24026nsto HIGH LevelR L = 667ΩDM74LS24126 DM74LS240 • DM74LS241Physical Dimensions inches (millimeters) unless otherwise noted20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 WidePackage Number M20B 6D M 74L S 240 • D M 74L S 241Physical Dimensionsinches (millimeters) unless otherwise noted (Continued)20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm WidePackage Description M20D7DM74LS240 • DM74LS241 Octal 3-STATE Buffer/Line Driver/Line ReceiverPhysical Dimensions inches (millimeters) unless otherwise noted (Continued)20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 WidePackage Number N20AFairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.LIFE SUPPORT POLICYFAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea-sonably expected to result in a significant injury to the user.2. A critical component in any component of a life support device or system whose failure to perform can be rea-sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.。

单片机系统涉及复习题

单片机系统设计复习题（9）一、填空题（每空1分，共20分）1．MCS-51系列单片机8031、8751、89C51在内部存储器的设置上主要区别是：8031内部（）程序存储器，8751内部（）程序存储器，89C51内部（）程序存储器。

2．完成下列不同数制间的转换：（10100101）B =（）D；（11000011）B=（）H；（58）D=（）BCD。

3．单片机并行I/O端口在输出数据时对端口锁存器无特殊要求，而在输入数据时，必须事先向锁存器写入高电平，如果锁存器处在低电平状态则会引起（）后果。

4．8031单片机内部低128B的随机数据存储器内部，常分为寄存器工作组区、位寻址区、数据存储/缓冲区等。

其寄存器工作组区，位寻址区都有确定的地址范围。

堆栈区一般没有确定的地址范围，选择栈底的原则是（）。

5．转移指令LJMP addr16的转移范围是（），调用指令ACALL addr11的调用范围是（）。

6．在中断调用过程和一般调用指令的使用中，能事先确定断点地址的是（），调用范围不受指令类型限制的是（）。

7．单片机内外中断源按优先级别分为高级中断和低级中断，级别的高低是由（）寄存器的置位状态决定的。

同一级别中断源的优先顺序是由（）决定的。

8．用汇编语言指令编写的程序，应该称作（）程序，经过汇编的程序应该称作（）。

9．在调用子程序时，为保证程序调用和返回不致混乱，常采用保护现场的措施。

通常在进入子程序后要用（）指令保护现场DPH、DPL、ACC等。

在退出子程序之前要用POP 指令依次恢复现场用（）指令返回。

10、用仿真开发系统调试程序时，汇编成功只说明源程序的（）没有问题，而程序（）还要靠运行调试纠错才能成功。

二、选择题（每空1分，共20分）1．在程序状态字寄存器PSW中，判断是否有借位时用（）标志位；若选择寄存器工作组要用（）标志位置高电平。

A、CYB、OVC、PD、RSOE、RSI2．CPU允许接受相应中断，当INTO申请中断时，程序计数器PC的内容被自动修改为（）地址；当有定时器T1申请中断时，程序计数器PC的内容被自动修改为（）地址。

54LS24474LS244 LSTTL型八缓冲器总线驱动器(三态

A
tPZL 传输PLZ 传输延迟时间
tPHZ 传输延迟时间
Y CL=45pF RL=667Ω
Y CL=5pF RL=667Ω
最小
参数值典型
12 12 20 15 15 10
最大 18 18 30 23 25 18
单位 ns ns ns
BDTIC 半导体事业部 /Semiconductor
BDTIC 半导体事业部 /Semiconductor
54LS244/74LS244 LSTTL 型八缓冲器/总线驱动器（三态、原码）
推荐工作条件
符号
Vcc VIH VIL IOH IOL TA
参数名称
电源电压输入高电平电压输入低电平电压输出高电平电流输出低电平电流
-1.5 0.2 0.4
2.4 3.1
2.0
0.25 0.4
0.1
20 -0.2
20
-20
-40
-225
17 27
27 46
32 54
单位
V V V
V
V
mA μA mA μA
μA mA mA mA mA
交流（开关）参数：Vcc=5.0V, TA=25℃
符号参数名称从（输入）到（输出）测试条件
tPLH 传输延迟时间 tPHL 传输延迟时间
0.35 0.5
II
输入电流 (最大输入电压时)
Vcc=最大
VI=7V
0.1
IIH 输入高电平电流 Vcc=最大 VI=2.7V
IIL 输入低电平电流 Vcc=最大 VI=0.4V
IOZH
高关态输出电流
Vcc=最大 VI=2.0V VIL=最大 Vo=2.7V