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MC74F657AN
Octal bidirectional transceiver with 8-bit parity generator checker
OCT AL BIDIRECTIONAL
TRANSCEIVER WITH 8-BIT PARITY
GENERA TOR CHECKER
(3-ST ATE 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 non-
inverting 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) en-
ables 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 μA in
HIGH and LOW States) Ideal in Applications Where High Output Drive and Light Bus Loading
are Required (IIL is 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 ASSIGNMENTT/R B1 B2 B3 GNDGND B4 A1 A2 A3 A4 VCC A5 A7 ERROR B7B6 PARITY
ODD/
EVEN
LOGIC SYMBOL 12 3 4 5 6 8 9 10
