74LS253/54LS253 pdf datasheet

54LS253/DM54LS253/DM74LS253
TRI-STATEÉ Data Selectors/Multiplexers
General Description
Each of these Schottky-clamped data selectors/multiplexers
contains inverters and drivers to supply fully complementary,
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 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.
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 available.
Contact a National Semiconductor Sales Office/
Distributor for specifications.