Packaging information
| Package | Pins PDIP (N) | 16 |
| Operating temperature range (°C) 0 to 70 |
| Package qty | Carrier 25 | TUBE |
Features for the SN74AS138
- Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems
- Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception
- Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
Description for the SN74AS138
The ´ALS138A and ´AS138 are 3-line to 8-line decoders/demultiplexers designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance systems, these devices can be used to minimize the effects of system decoding. When employed with high-speed memories with a fast enable circuit, the delay times of the decoder and the enable time of the memory are usually less than the typical access time of the memory. The effective system delay introduced by the Schottky-clamped system decoder is negligible.
The conditions at the binary-select (A, B, and C) inputs and the
three enable (G1, 
, and 
) inputs select one of eight output
lines. Two active-low and one active-high enable inputs reduce the
need for external gates or inverters when expanding. A 24-line
decoder can be implemented without external inverters and a 32-line
decoder requires only one inverter. An enable input can be used as a
data input for demultiplexing applications.
The SN54ALS138A and SN54AS138 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS138A and SN74AS138 are characterized for operation from 0°C to 70°C.