SN74AS137
SN74AS137 is 3-Line To 8-Line Decoders/Demultiplexers manufactured by Texas Instruments.
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.
Y7
SN54ALS137A . . . J PACKAGE SN74ALS137A, SN74AS137 . . . D OR N PACKAGE
(TOP VIEW)
A1 B2 C3 LE 4 G2 5 G1 6 Y7 7 GND 8
16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6
SN54ALS137A . . . FK PACKAGE (TOP VIEW)
Y0
3 2 1 20 19
C4
18 Y1
LE 5
17 Y2
NC 6
16 NC
G2 7
15 Y3
G1 8
14 Y4
9 10 11 12 13
Y6
Y5
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.
- No internal connection
INPUTS ENABLE
LE G1...
