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DM74LS251M Datasheet

  • DM74LS251M

  • 3-STATE 1-of-8 Line Data Selector/Multiplexer

  • FAIRCHILD

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DM74LS251 3-STATE 1-of-8 Line Data Selector/Multiplexer
August 1986
Revised March 2000
DM74LS251
3-STATE 1-of-8 Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain full on-chip
binary decoding to select one-of-eight data sources, and
feature a strobe-controlled 3-STATE output. The strobe
must be at a low logic level to enable these devices. The 3-
STATE outputs permit direct connection to a common bus.
When the strobe input is HIGH, both outputs are in a high-
impedance state in which both the upper and lower transis-
tors of each totem-pole output are OFF, and the output nei-
ther drives nor loads the bus significantly. When the strobe
is LOW, the outputs are activated and operate as standard
TTL totem-pole outputs.
To minimize the possibility that two outputs will attempt to
take a common bus to opposite logic levels, the output con-
trol circuitry is designed so that the average output disable
time is shorter than the average output enable time.
Features
s
3-STATE version of DM74LS151
s
Interface directly with system bus
s
Perform parallel-to-serial conversion
s
Permit multiplexing from N-lines to one line
s
Complementary outputs provide true and inverted data
s
Maximum number of common outputs: 129
s
Typical propagation delay time (D to Y): 17 ns
s
Typical power dissipation: 35 mW
Ordering Code:
Order Number
DM74LS251M
DM74LS251N
Package Number
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
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 鈥淴鈥?to the ordering code.
Connection Diagram
Function Table
Inputs
Select
C
X
L
L
L
L
H
H
H
H
B
X
L
L
H
H
L
L
H
H
A
X
L
H
L
H
L
H
L
H
Strobe
S
H
L
L
L
L
L
L
L
L
Outputs
Y
Z
D0
D1
D2
D3
D4
D5
D6
D7
W
Z
D0
D1
D2
D3
D4
D5
D6
D7
H
=
HIGH Logic Level
L
=
LOW Logic Level
X
=
Don't Care
Z
=
High Impedance (OFF)
D0, D1鈥7
=
The level of the respective D input
漏 2000 Fairchild Semiconductor Corporation
DS006415
www.fairchildsemi.com

DM74LS251M 產(chǎn)品屬性

  • Fairchild Semiconductor

  • Multiplexer

  • LS

  • 8 / 1

  • 38 ns at 5 V

  • 5.25 V

  • 4.75 V

  • + 70 C

  • SMD/SMT

  • SOIC-16

  • Rail

  • 0 C

  • 8

  • 1

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