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54LS257 Datasheet(PDF) 2 Page - Texas Instruments

Part No. 54LS257
Description  TRI-STATE(RM) Quad 2-Data Selectors/Multiplexers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

54LS257 Datasheet(HTML) 2 Page - Texas Instruments

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TLF6417
June 1989
54LS257ADM54LS257BDM74LS257B
54LS258ADM54LS258BDM74LS258B
TRI-STATE
Quad 2-Data SelectorsMultiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems With all but one of the
common outputs disabled (at a high impedance state) the
low impedance of the single enabled output will drive the
bus line to a high or low logic level To minimize the possibil-
ity that two outputs will attempt to take a common bus to
opposite logic levels the output enable circuitry is designed
such that the output disable times are shorter than the out-
put enable times
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses It also permits the use of standard TTL reg-
isters for data retention throughout the system
Features
Y
TRI-STATE versions LS157 and LS158 with same pin-
outs
Y
Schottky-clamped for significant improvement in A-C
performance
Y
Provides bus interface from multiple sources in high-
performance systems
Y
Average propagation delay from data input 12 ns
Y
Typical power dissipation
LS257B
50 mW
LS258B
35 mW
Y
Alternate
militaryaerospace
devices
(54LS257A
54LS258A) are available Contact a National Semicon-
ductor Sales OfficeDistributor for specifications
Connection Diagrams
Dual-In-Line Package
TLF6417 – 1
Order Number 54LS257ADMQB 54LS257AFMQB
54LS257ALMQB DM54LS257BJ DM54LS257BW
DM74LS257BM or DM74LS257BN
See NS Package Number E20A J16A
M16A N16E or W16A
Dual-In-Line Package
TLF6417 – 2
Order Number 54LS258ADMQB 54LS258AFMQB
54LS258ALMQB DM54LS258BJ DM54LS258BW
DM74LS258BM or DM74LS258BN
See NS Package Number E20A J16A
M16A N16E or W16A
Function Table
Inputs
Output Y
Output
Select
A
B
LS257
LS258
Control
HX
X
X
Z
Z
LL
L
X
L
H
LL
H
X
H
L
LH
X
L
L
H
LH
X
H
H
L
H e High Level L e Low Level X e Don’t Care
Z e High Impedance (off)
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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