© 1999 Fairchild Semiconductor Corporation DS009584 www.fairchildsemi.com
March 1988
Revised August 1999
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4F657
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74F657
Octal Bidirectional Transceiver with
8-Bit Parity Generator/Checker and 3-STATE Outputs
General Description
The 74F657 contains eight non-inverting buffers with 3-
STATE outputs and an 8-bit parity generator/checker. It is
intended for bus-oriented applications. The buffers have a
guaranteed current sinking capability of 24 mA at the A
Port and 64 mA at the B Port.
Features
a73 300 Mil 24-pin slimline DIP
a73 Combines 74F245 and 74F280A functions in one
package
a73 3-STATE outputs
a73 B Outputs sink 64 mA
a73 12 mA source current, B side
a73 Input diodes for termination effects

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Order Number Package Number Package Description
75F657SC M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F657SPC N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide