|Category||Logic => Parity Generators/Checkers|
|Description||Octal Bidirectional Transceiver With 8-bit Parity Generator Checker ( 3-state Outputs )|
|Company||Motorola Semiconductor Products|
|Datasheet||Download MC74F657ADW/BDW datasheet
|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 mA at the A ports and 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 µA in HIGH and LOW States) Ideal in Applications Where High Output Drive and Light Bus Loading are Required (IIL 20 µA versus Fast std of 600 µA) 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 ASSIGNMENTOCTAL BIDIRECTIONAL TRANSCEIVER WITH 8-BIT PARITY GENERATOR CHECKER (3-STATE OUTPUTS)
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current High Output Current Low Parameter Min 4.5 0 Typ 5.0 25 Max Unit °C mA
Number of Inputs That are High OE T/R Inputs Even/Odd Input/Output Parity Error Outputs Mode Transmit ReceiveH = HIGH Voltage Level; L = LOW Voltage Level; X = Don't Care; Z = HIGH impedance state.
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 B0B7 PARITY, ERROR A0A7 VOL Output LOW Voltage B0B7 PARITY, ERROR V mA IIH Input HIGH Current B0B7, 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 mA VCC = MAX VCC = MAX, VOUT A0A7 B0B7 PARITY 50 µA VCC = MAX, VOUT 0.5 V VCC = MAX, VOUT 0.5 V VCC = MAX, VOUT V µA IOH mA 0.73 Parameter Min 0.8 1.2 Typ Max Unit 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
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.
|Some Part number from the same manufacture Motorola Semiconductor Products|
|MC74F657AJ Octal Bidirectional Transceiver With 8-bit Parity Generator Checker|
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