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SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS
• Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
• Choice of True or Inverting Logic • A-Bus Outputs Are Open Collector;
B-Bus Outputs Are 3 State
• Package Options Include Plastic
Small-Outline (DW) Packages and
Standard Plastic (N) 300-mil DIPs
DEVICE
SN74ALS638A, SN74AS638A SN74ALS639A, SN74AS639
A OUTPUT
Open collector Open collector
B OUTPUT
3 state 3 state
LOGIC
Inverting True
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
DW OR N PACKAGE (TOP VIEW)
DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9
GND 10
20 VCC 19 OE 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
description
These octal bus transceivers are designed for asynchronous two-way communication between open-collector and 3-state b
SN74AS638A Datasheet
