MC74F657B

www.DataSheet4U.com 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 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 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) F...