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| MC74F657A,B OCTAL BIDIRECTIONAL TRANSCEIVER WITH 8-BIT PARITY GENERATOR CHECKER (3-STATE OUTPUTS) The MC74F657A and MC74F657B are Octal Bidirectional Transceivers with an 8-bit parity Generator/Checker and 3-state outputs. The A and B options are faster versions of the F657 and contain eight noninverting buffers with 3-state outputs and an 8-bit parity generator/checker. These devices are intended for bus-oriented applications. The buffers have a guaranteed current sinking capability of 24 mA at the A ports and 64 mA at the B ports. The Transmit/Receiver (T/R) input determines the direction of the data flow through the bidirectional transceivers. Transmit (active HIGH) enables data from A ports to B ports; Receive (active LOW) enables data from B ports to A ports. * High-Impedance NPN Base Input for Reduced Loading (20 A in HIGH and LOW States) * Ideal in Applications Where High Output Drive and Light Bus Loading are Required (IIL is 20 A versus Fast std of 600 A) * Combines F245 and F280A Functions in One Package * 3-State Outputs * B Outputs, PARITY, ERROR, Sink 64 mA and Source 15 mA * 15 mA Source Current * Input Diodes for Termination Effects * Glitchless Outputs During Power Up and Power Down * High Impedance Outputs During Power Off * ESD Protection > 4000 Volts PIN ASSIGNMENT OE 24 B0 23 B1 22 B2 21 B3 GND GND B4 20 19 18 17 B5 16 B6 15 B7 PARITY 14 13 24 1 OCTAL BIDIRECTIONAL TRANSCEIVER WITH 8-BIT PARITY GENERATOR CHECKER (3-STATE OUTPUTS) FASTTM SCHOTTKY TTL 24 1 J SUFFIX CERAMIC CASE 758-01 24 1 N SUFFIX PLASTIC CASE 724-03 DW SUFFIX SOIC CASE 751E-03 ORDERING INFORMATION MC74FXXXAJ/BJ MC74FXXXAN/BN MC74FXXXADW/BDW Ceramic Plastic SOIC 1 T/R 2 A0 3 A1 4 A2 5 A3 8 6 7 A4 VCC A5 9 A6 10 11 12 A7 ODD/ ERROR EVEN LOGIC SYMBOL 2 3 4 5 6 8 9 10 1 24 11 A0 A1 T/R OE EVEN/ODD B0 B1 A2 A3 A4 A5 A6 A7 PARITY ERROR 13 12 B2 B3 B4 B5 B6 B7 23 22 21 20 17 16 15 14 FAST AND LS TTL DATA 4-247 MC74F657A, B GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 74 74 74 74 Min 4.5 0 Typ 5.0 25 Max 5.5 70 -3.0/-15 24/64 Unit V C mA mA FUNCTION TABLE Number of Inputs That are High OE L L L L L L T/R H H L L L L Inputs Even/Odd H L H H L L Input/Output Parity H L H L H L Error Z Z H L L H Outputs Outputs Mode Transmit Transmit Receive Receive Receive Receive 0, 2, 4, 6, 8 Number of Inputs That are High OE L L L L L L H T/R H H L L L L X Inputs Even/Odd H L H H L L X Input/Output Parity L H H L H L Z Error Z Z L H H L Z Outputs Outputs Mode Transmit Transmit Receive Receive Receive Receive Z 1, 3, 5, 7 Don't Care H = HIGH Voltage Level; L = LOW Voltage Level; X = Don't Care; Z = HIGH impedance state. FAST AND LS TTL DATA 4-248 MC74F657A, B DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage All Outputs VOH Output HIGH Voltage B0-B7 PARITY, ERROR A0-A7 VOL Output LOW Voltage B0-B7 PARITY, ERROR 74 74 74 74 2.4 V 2.7 2.0 0.35 0.4 0.5 0.55 100 2.0 mA IIH Input HIGH Current B0-B7, PARITY EVEN/ODD T/R, OE EVEN/ODD IIL IIH +IOZH IIL +IOZL IOZH IOZL Input LOW Current T/R, OE Off-State Current HIGH Level Voltage Applied Off-State Current LOW Level Voltage Applied Off-State Output Current, High-Level Voltage Applied Off-State Output Current, Low-Level Voltage Applied Output Short Circuit Current (Note 2) ERROR -50 An Outputs PARITY, Bn Outputs, ERROR ICCH ICC Total Supply Current ICCL ICCZ -60 -100 90 106 98 -150 mA -225 135 150 145 mA VCC = MAX VCC = MAX, VOUT = 0 V A0-A7 B0-B7 PARITY -40 70 A -70 50 A VCC = MAX, VOUT = 0.5 V VCC = MAX, VOUT = 0.5 V VCC = MAX, VOUT = 2.7 V 1.0 20 40 -20 A 3.4 V V V A IOH = -3.0 mA -0.73 Parameter Min 2.0 0.8 -1.2 Typ Max Unit V V V Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage VCC = MIN, IIN = -18 mA VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V IOH = -15 mA IOL = 24 mA IOL = 64 mA VCC = MIN T/R, OE, EVEN/ODD A0-A7 VCC = 0 V, VIN = 7.0 V VCC = 5.5 V, VIN = 5.5 V VCC = 5.5 V, VIN = 5.5 V VCC = MAX, VIN = 2.7 V A VCC = MAX, VIN = 0.5 V VCC = MAX, VOUT = 2.7 V IOS NOTES: 1. For conditions shown as MIN or MAX, use appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at one time, nor for more than 1 second. FAST AND LS TTL DATA 4-249 MC74F657A, B F657A AC ELECTRICAL CHARACTERISTICS 74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay An to Bn or Bn to An Propagation Delay An to PARITY Propagation Delay EVEN/ODD to PARITY, ERROR Propagation Delay Bn to ERROR Propagation Delay PARITY to ERROR Output Enable Time to HIGH or LOW Level Output Disable Time from HIGH or LOW Level Min 2.0 2.0 6.0 6.5 4.5 4.5 7.0 7.0 8.0 7.0 3.0 4.0 2.0 2.0 Typ Max 7.0 7.0 13 13 10.5 10.5 18 18 14 14 8.0 9.0 7.5 6.0 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF Min 2.0 2.0 5.5 6.5 4.5 4.5 6.5 6.5 7.0 7.0 3.0 4.0 2.0 2.0 Max 7.5 7.5 14 14 11 11.5 19 19 15 15 9.0 10 8.0 6.5 Unit ns ns ns ns ns ns ns F657B AC ELECTRICAL CHARACTERISTICS 74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay An to Bn or Bn to An Propagation Delay An to PARITY Propagation Delay EVEN/ODD to PARITY, ERROR Propagation Delay Bn to ERROR Propagation Delay PARITY to ERROR Output Enable Time to HIGH or LOW Level Output Disable Time from HIGH or LOW Level Min 2.0 2.0 4.5 4.5 2.0 2.0 4.0 4.0 5.0 5.0 2.0 2.0 2.0 2.0 Typ Max 6.0 6.0 11.5 11.5 7.5 7.5 15 15 11 11 7.0 7.0 6.0 6.0 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF Min 2.0 2.0 4.5 4.5 2.0 2.0 3.5 3.5 4.0 4.0 2.0 2.0 2.0 2.0 Max 6.5 6.5 13 13 8.5 8.5 16 16 12 12 8.0 8.0 6.5 6.5 Unit ns ns ns ns ns ns ns FAST AND LS TTL DATA 4-250 MC74F657A, B LOGIC DIAGRAM T/R OE A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 EVEN/ODD PARITY ERROR FAST AND LS TTL DATA 4-251 |
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