Combines Decoder and 3-Bit Address

Latch

Incorporates Two Output Enables to

Simplify Cascading

Package Options Include Plastic Small-

Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

The SN54ALS137A, SN74ALS137A, and

SN74AS137 are 3-line to 8-line decoders/

demultiplexers with latches on the three address

inputs. When the latch-enable (LE) input is low,

the devices act as decoders/demultiplexers.

When LE goes from low to high, the address

present at the select (A, B, and C) inputs is stored

in the latches. Further address changes are

ignored as long as LE remains high. The

output-enable controls (G1 and G2) control the

outputs independently of the select or

latch-enable inputs. All of the outputs are forced

high if G1 is low or G2 is high. These devices are

ideally suited for implementing glitch-free

decoders in strobed (stored-address) applications

in bus-oriented systems.

The SN54ALS137A is characterized for operation

over the full military temperature range of −55°C

to 125°C. The SN74ALS137A and SN74AS137

are characterized for operation from 0°C to 70°C.