93L09 Datasheet, PDF (3/4 Pages) National Semiconductor (TI) – Dual 4-Input Multiplexer

Switching Characteristics V_CC e a5 0V T_A e a25 C
Symbol
Parameter
Min
t_PLH
t_PHL
t_PLH
t_PHL
t_PLH
t_PHL
t_PLH
t_PHL
Propagation Delay
S₀ to Z_a
Propagation Delay
S₀ to Z_a
Propagation Delay
I₀ to Z_a
Propagation Delay
S₀ to Z_a
C_L e 15 pF
Max
70
60
55
50
70
65
40
60
Functional Description
The 93L09 dual 4-input multiplexers are able to select two
bits of either HIGH or LOW data or control from up to four
sources in one package The 93L09 is the logical imple-
mentation of two-pole four-position switch with the position
of the switch being set by the logic levels supplied to the
two select inputs Both assertion and negation outputs are
provided for both multiplexers The logic equations for the
outputs are shown below
Za e I0a  S1  S0 a I1a  S1  S0 a I2a  S1  S0 a I3a  S1  S0
Zb e I0b  S1  S0 a I1b  S1  S0 a I2a  S1  S0 a I3b  S1  S0
The 93L09 is frequently used to move data from a group of
registers to a common output bus The particular register
from which the data came would be determined by the state
of the select inputs A less obvious application is as a func-
tion generator The 93L09 can generate two functions of
three variables This is useful for implementing random gat-
ing functions
Truth Table
Select
Inputs
Inputs
(a or b)
S0 S1 I0 I1 I2 I3
L
L
LXXX
L
L
HXXX
H
L
XLXX
H
L
XHXX
L
H XXLX
L
H XXHX
H
H XXXL
H
H XXXH
H e HIGH voltage level
L e LOW voltage level
X e Immaterial
Units
ns
ns
ns
ns
Outputs
(a or b)
Z
Z
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
Logic Diagram
TL F 9602 – 3
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