Packaging information
| Package | Pins SOIC (DW) | 20 |
| Operating temperature range (°C) 0 to 70 |
| Package qty | Carrier 25 | TUBE |
Features for the SN74ALS642A-1
- 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 for the SN74ALS642A-1
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 
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.