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DM54S257 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM54S257
Description  TRI-STATE QUAD 1 OF 2 DATA SELECTORS / MULTIPLEXERS
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54S257 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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TLF6482
June 1989
DM54S257DM74S257 DM54S258DM74S258
TRI-STATE
Quad 1 of 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 S157 S158 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
S257 48 ns
S258 4 ns
Y
Typical power dissipation
S257 320 mW
S258 280 mW
Connection Diagrams
Dual-In-Line Package
TLF6482 – 1
Dual-In-Line Package
TLF6482 – 2
Order Number DM54S257J DM54S258J DM54S257W DM74S257N or DM74S258N
See NS Package Number J16A N16E or W16A
Function Table
Inputs
Output Y
Output
Select
A
B
S257
S258
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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