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DM54LS251 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM54LS251
Description  TRI-STATE Data Selectors/Multiplexers
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DM54LS251 Datasheet(HTML) 1 Page - National Semiconductor (TI)

   
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TLF6415
June 1989
DM54LS251DM74LS251
TRI-STATE
Data SelectorsMultiplexers
General Description
These data selectorsmultiplexers contain full on-chip bina-
ry decoding to select one-of-eight data sources and feature
a strobe-controlled TRI-STATE output The strobe must be
at a low logic level to enable these devices The TRI-STATE
outputs permit direct connection to a common bus When
the strobe input is high both outputs are in a high-imped-
ance state in which both the upper and lower transistors of
each totem-pole output are off and the output neither 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
Y
TRI-STATE version of LS151
Y
Interface directly with system bus
Y
Perform parallel-to-serial conversion
Y
Permit multiplexing from N-lines to one line
Y
Complementary outputs provide true and inverted data
Y
Maximum number of common outputs
54LS
49
74LS
129
Y
Typical propagation delay time (D to Y)
54LS
17 ns
74LS
17 ns
Y
Typical power dissipation
54LS
35 mW
74LS
35 mW
Connection Diagram
Dual-In-Line Package
TLF6415 – 1
Order Number DM54LS251J DM54LS251W
DM74LS251M or DM74LS251N
See NS Package Number J16A M16A N16E or W16A
Function Table
Inputs
Outputs
Select
Strobe
YW
CBA
S
XXX
H
Z
Z
L
L
L
L
D0
D0
L
L
H
L
D1
D1
L
H
L
L
D2
D2
L
H
H
L
D3
D3
H
L
L
L
D4
D4
H
L
H
L
D5
D5
H
H
L
L
D6
D6
H
H
H
L
D7
D7
H e High Logic Level L e Low Logic Level
X e Don’t Care Z e High Impedance (Off)
D0 D1
D7 e The level of the respective D input
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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