GTLP8T306中文资料

© 2000 Fairchild Semiconductor Corporation DS500051September 1997Revised April 2000GTLP8T306 8-Bit LVTTL/GTLP Bus TransceiverGTLP8T3068-Bit LVTTL/GTLP Bus TransceiverGeneral DescriptionThe GTLP8T306 is an 8-bit bus transceiver that provides LVTTL to GTLP signal level translation. The device pro-vides a high speed interface between cards operating at LVTTL logic levels and a backplane operating at GTLP logic levels. High speed backplane operation is a direct result of GTLP’s reduced output swing (<1V), reduced input threshold levels and output edge rate control. The edge rate control minimizes bus settling time. GTLP is a Fairchild Semiconductor derivative of the Gunning Transceiver logic (GTL) JEDEC standard JESD8-3.Fairchild’s GTLP has internal output edge-rate control and is process, voltage, and temperature (PVT) compensated.Its function is similar to BTL and GTL but with different out-put levels and receiver thresholds. The GTLP output LOW level is typically less than 0.5V, the output HIGH level is 1.5V and the receiver threshold is 1.0V.Featuress Bidirectional interface between GTL/GTLP and LVTTL logic levels s Output Edge Rate Control to minimize noise on the GTLP port s Power up/down/off high impedance for live insertion s Standard 245 functions CMOS technology for low power dissipation s 5V tolerant inputs and outputs on the A-Ports Bus-hold data inputs on the A-Port eliminates the need for external pull-up resistors on unused inputs s LVTTL compatible driver and control inputs s Flow through pinout optimizes PCB layouts Open drain on GTLP to support wired-or connection s A-Port source/sink −24 mA/+24 mA s B-Port sink 50 mAs Recommended Operating Temperature −40°C to +85°COrdering Code:Devices also available in T ape and Reel. Specify by appending the suffix letter “X ” to the ordering code.Logic Symbol Connection DiagramOrder Number Package NumberPackage DescriptionGTLP8T306MTCMTC2424-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 2G T L P 8T 306Pin DescriptionsTruth TableFunctional DescriptionThe GTLP8T306 is an 8-bit transceiver providing the standard 245 functionality that supports both GTL and GTLP signal levels.Data polarity is non-inverting and the data flow direction is controlled by the T/R pin. The outputs are enabled to allow data through the device when OE is LOW otherwise both the A and B ports are placed in a HIGH impedance state.Logic DiagramPin Names DescriptionOE Output Enable (Active LOW)T/R Transmit/Receive InputA0–A7Side A Inputs or 3-STATE Outputs B0–B7Side B Inputs or 3-STATE Outputs V REFGTLP Reference VoltageInputsOutputOE T/R H X HIGH Z on Bus A and Bus B L L Bus B Data to Bus A LHBus A Data to Bus BGTLP8T306Absolute Maximum Ratings (Note 1)Recommended Operating Conditions (Note 3)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 rating.The “Recommended Operating Conditions ” table will define the conditions for actual device operation.Note 2: I O Absolute Maximum Rating must be observed.Note 3: Unused inputs must be held high or low.Supply Voltage (V CC )−0.5V to 7.0V DC Input Voltage (V I )−0.5V to +7.0VDC Output Voltage (V O )Outputs 3-STATE −0.5V to +7.0V Outputs Active (Note 2)−0.5V to 7.0VDC Output Sink Current into A-Port I OL 48 mADC Output Source Current from A-Port I OH−48 mADC Output Sink Current into B-Port in the LOW State, I OL 100 mA DC Input Diode Current (I IK )V I < 0V−50 mA DC Output Diode Current (I OK )V O < 0V −50 mA V O > V CC +50 mA ESD Rating>2000VStorage Temperature (T STG )−65°C to +150°CSupply Voltage V CC3.15V to 3.45VBus Termination Voltage (V TT )GTLP 1.35V to 1.65V GTL1.14V to 1.26V Input Voltage (V I ) on A-Port and control pins0V to 5.5V HIGH Level Output Current (I OH )A-Port−24 mA LOW Level Output Current (I OL )A-Port +24 mA B-Port+50 mAOperating Temperature (T A )−40°C to +85°C 4G T L P 8T 306DC Electrical CharacteristicsOver Recommended Operating Free-Air Temperature Range, V REF = 1.0V (unless otherwise noted).Note 4: All typical values are V CC = 3.3V and T A = 25°C.Note 5: For conditions shown as Min, use the appropriate value specified under recommended operating conditions.Note 6: This is the increase in supply current for each input that is at the specified LVTTL voltage level rather than V CC or GND.Symbol Test ConditionsMin Typ(Note 4)Max Units V IH B-Port V REF +0.05V TT V Others 2.0V V IL B-Port 0.0V REF −0.05V Others 0.8V V REF GTLP 1.0V GTL0.8VV IK V CC = 3.15V I I = −18 mA −1.2VV OHA-Port V CC = Min to Max(Note 5)I OH = −100 µA V CC −0.2VV CC = 3.15VI OH = −12 mA 2.4I OH = −24 mA 2.0V OLA-PortV CC = Min to Max (Note 5)I OL = 100 µA 0.2VV CC = 3.15VI OL = 24 mA 0.5B-PortV CC = 3.15VI OL = 40 mA 0.4V I OL = 50 mA0.55I IA-Port V CC = 3.45V V I = 5.5V 20µA V I = 0V −20Control Pins V CC = 3.45V V I = 5.5V 5µAV I = 0V −5B-PortV CC = 3.45V V I = V TT 5µA V I = 0−5I OFF A-Port V CC = 0V I or V O =0to 4.5V 100µA I I (Hold)A-Port V CC = 3.15V V I = 0.8V 75µA V I = 2.0V −20I OZH A-Port V CC = 3.45VV O = 3.45V 20µA B-Port V O = 1.5V 5I OZL A-Port V CC = 3.45V V O = 0−20µA B-Port V CC = 3.45V V O = 0.55−5I CCA orB PortsV CC = 3.45V Outputs HIGH 718mAOutputs LOW 820I O = 0V I = V CC or GNDOutputs Disabled 820I CC A-Port and V CC = 3.45VOne Input at V CC –0.6V1mA(Note 6)Control Pins A or Control Inputs at V CC or GNDC INControl Pins V I = V CC or 05pFA-Port V I = V CC or 07B-PortV I = V CC or 09GTLP8T306AC Electrical CharacteristicsOver recommended range of supply voltage and operating free air-temperature, V REF = 1.0V (unless otherwise noted).C L = 30 pF for B-Port and C L = 50 pF for A-Port.Note 7: All typical values are at V CC = 3.3V and T A = 25°C.Symbol From (Input)To (Output)Min Typ (Note 7)Max Unitst PLH AnBn1.0 4.07.5nst PHL 1.05.17.5t PLH BnAn1.05.88.3nst PHL 1.04.98.3t RISE Transition Time, B Outputs (20% to 80%) 2.6ns t FALL Transition Time, B Outputs (20% to 80%) 2.6ns t RISE Transition Time, A Outputs (10% to 90%) 2.5ns t FALL Transition Time, A Outputs (10% to 90%)2.5nst PZH , t PZL OEAn1.0 4.59.5nst PHZ , t PLZ 1.04.99.5t PLH OEBn1.0 5.49.5nst PHL1.06.09.5 6G T L P 8T 306Test Circuit and Timing WaveformsTest Circuit for A OutputsVoltage Waveforms Pulse Duration (V M = V CC /2 for A-Port and 1.0 for B-Port)Test Circuit for B OutputsVoltage Waveforms Enable and Disable TimesA-PortVoltage Waveforms Propagation Delay and Setup and Hold Times(V M = V CC /2 for A-Port and 1.0 for B-Port)Note A: C L includes probes and Jig capacitance.Note B: For B-Port, C L = 30 pF is used for worst case.7GTLP8T306 8-Bit LVTTL/GTLP Bus TransceiverPhysical Dimensions inches (millimeters) unless otherwise noted24-Lead Thin Shrink Small Outline Package, JEDEC MO-153, 4.4mm WidePackage Number MTC24Fairchild 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.。