TL/F/6416
54LS253/DM54LS253/DM74LS253
TRI-STATE
Data
Selectors/Multiplexers
June 1989
54LS253/DM54LS253/DM74LS253
TRI-STATE Data Selectors/Multiplexers
General Description
Each of these Schottky-clamped data selectors/multiplex-
ers contains inverters and drivers to supply fully comple-
mentary, on-chip, binary decoding data selection to the
AND-OR gates. Separate output control inputs are provided
for each of the two four-line sections.
The TRI-STATE outputs can interface directly with data
lines of bus-organized systems. With all but one of the com-
mon 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.
Features
Y
TRI-STATE version of LS153 with same pinout
Y
Schottky-diode-clamped transistors
Y
Permit multiplexing from N-lines to one line
Y
Performs parallel-to-serial conversion
Y
Strobe/output control
Y
High fanout totem-pole outputs
Y
Typical propagation delay
Data to output 12 ns
Select to output 21 ns
Y
Typical power dissipation 35 mW
Y
Alternate Military/Aerospace device (54LS253) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6416–1
Order Number 54LS253DMQB, 54LS253FMQB,
54LS253LMQB, DM54LS253J, DM54LS253W,
DM74LS253M or DM74LS253N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Select
Data Inputs
Output
Output
Inputs Control
B A C0 C1 C2 C3 G Y
XXXXXX H Z
LLLXXX L L
LLHXXX L H
LHXLXX L L
LHXHXX L H
HLXXLX L L
HLXXHX L H
HHXXX L L L
HHXXXH L H
Address Inputs A and B are common to both sections.
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.
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.