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DM74ALS137 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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DM74ALS137 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page © 2000 Fairchild Semiconductor Corporation DS006202 www.fairchildsemi.com February 1991 Revised February 2000 DM74ALS137 3 to 8 Line Decoder/Demultiplexer with Address Latches General Description The ALS137 is a three line to eight line decoder/demulti- plexer with latches on the three address inputs. When the latch-enable input (GL) is LOW, the ALS137 acts as a decoder/demultiplexer. When GL goes from LOW-to-HIGH, the address present at the select inputs (A, B, and C) is stored in the latches. Further address changes are ignored as long as GL remains HIGH. The output enable controls, G1 and G2, control the state of the outputs independently of the select or latch-enable inputs. All of the outputs are HIGH unless G1 is HIGH and G2 is LOW. The ALS137 is ideally suited for implementing glitch-free decoders in strobed (stored-address) applications in bus-oriented sys- tems. Features s Combines decoder and 3-bit address latch s Incorporates 3 enable inputs to simplify cascading s Low power dissipation: 28 mW typ s Switching specifications guaranteed over full tempera- ture and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table L = LOW State H = HIGH State X = Don't Care Order Number Package Number Package Description DM74ALS137M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74ALS137N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Inputs Outputs Enable Select GL G1 G2 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X H H HHH HHH X L X X X X H H HHH HHH L H L L L L L H HHH HHH L H L L L H H L HHH HHH L H L L H L HH L H H HHH L H L L H H HH H L H HHH L H L H L L HH HH L HHH LH LH LH H H H H H L H H L H L H H L HH HHH H L H L H L H H H HH HHH HH L H H L X X X Output corresponding to stored address, L; all others, H |
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