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DM74ALS251MX 数据手册 - Fairchild（飞兆/仙童）
制造商:
Fairchild（飞兆/仙童）
分类:
逻辑控制器
封装:
SOIC-16
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DM74ALS251MX数据手册
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© 2000 Fairchild Semiconductor Corporation DS006214 www.fairchildsemi.com
April 1984
Revised April 2000
DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer
DM74ALS251
3-STATE 1-of-8 Line Data Selector/Multiplexer
General Description
This Data Selector/Multiplexer contains full on-chip decod-
ing to select one-of-eight data sources as a result of a
unique three-bit binary code at the Select inputs. Two com-
plementary outputs provide both inverting and non-invert-
ing buffer operation. An Output Control input is provided
which, when at the high level, places both outputs in the
high impedance OFF-State. In order to prevent bus access
conflicts, output disable times are shorter than output
enable times. The Select input buffers incorporate internal
overlap features to ensure that select input changes do not
cause invalid output transients.
Features
■ Advanced oxide-isolated, ion-implanted Schottky TTL
process
■ Switching performance is guaranteed over full tempera-
ture and V
CC
supply range
■ Pin and functional compatible with LS family counterpart
■ Improved output transient handling capability
■ Output control circuitry incorporates power-up 3-STATE
feature
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
D0 thru D7 = The Level of the Respective D Input
Order Number Package Number Package Description
DM74ALS251M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS251SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS251N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Outputs
Select Strobe
CBA S
YW
XXX H Z Z
LLL L D
0
D
0
LLH L D
1
D
1
LHL L D
2
D
2
LHH L D
3
D
3
HLL L D
4
D
4
HLH L D
5
D
5
HHL L D
6
D
6
HHH L D
7
D
7
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