Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

Choice of True or Inverting Logic

Package Options Include Plastic

Small-Outline (DW) Packages and

Standard Plastic (N) 300-mil DIPs

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending

upon the level at the direction-control (DIR) input. The output-enable (OE) input disables the device so that the

buses are effectively isolated.

The -1 versions of the SN74ALS641A and SN74ALS642A are identical to the standard versions, except that

the recommended maximum IOL is increased to 48 mA in the -1 versions.

The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.