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PDF ( 数据手册 , 数据表 ) DM74ALS137

零件编号 DM74ALS137
描述 3 to 8 Line Decoder/Demultiplexer with Address Latches
制造商 Fairchild Semiconductor
LOGO Fairchild Semiconductor LOGO 


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DM74ALS137 数据手册, 描述, 功能
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:
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Enable
Select
Outputs
GL G1 G2 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H X X X HHHHHHHH
X L X X X X HHHHHHHH
L H L L L L LHHHHHHH
L H L L L HHLHHHHHH
L H L L H L HH LHHHHH
L H L L H HHHHLHHHH
L H L H L L HHHHLHHH
L H L H L HHHHHH LHH
L H L H H L HHHHHHLH
L H L H H HHHHHHHHL
H H L X X X Output corresponding to stored
address, L; all others, H
L = LOW State
H = HIGH State
X = Don't Care
© 2000 Fairchild Semiconductor Corporation DS006202
www.fairchildsemi.com












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