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PDF DM54LS251 Data sheet ( Hoja de datos )
| Número de pieza | DM54LS251 | |
| Descripción | TRI-STATE Data Selectors/Multiplexers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1989
DM54LS251 DM74LS251
TRI-STATE Data Selectors Multiplexers
General Description
These data selectors multiplexers 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
Function Table
Inputs
Outputs
Select
Strobe Y W
CBA
S
XXX
H
ZZ
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
TL F 6415 – 1
Order Number DM54LS251J DM54LS251W
DM74LS251M or DM74LS251N
See NS Package Number J16A M16A N16E or W16A
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6415
RRD-B30M105 Printed in U S A
1 page  
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS251M
NS Package Number M16A
Molded Dual-In-Line Package (N)
Order Number DM74LS251N
NS Package Number N16E
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DM54LS251.PDF ] | |
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