SN74ALS639A, SN74AS638A Datasheet - Texas Instruments

SN74ALS639A OCTAL BUS TRANSCEIVERS

These octal bus transceivers are designed for asynchronous two-way communication between open-collector and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) inpu.

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 Inver.

SN74AS638A-etcTI.pdf