74HC158 Philips, 74HC158 Datasheet - Page 2

• Manufacturer Part Number: 74HC158
• Description: Quad 2-input multiplexer inverting
• Manufacturer: Philips

Philips Semiconductors
FEATURES
GENERAL DESCRIPTION
The 74HC/HCT158 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT158 are quad 2-input multiplexers which
select 4 bits of data from two sources and are controlled by
a common data select input (S). The four outputs present
the selected data in the inverted form. The enable input (E)
is active LOW.
When E is HIGH, all the outputs (1Y to 4Y) are forced
HIGH regardless of all other input conditions.
QUICK REFERENCE DATA
GND = 0 V; T
Notes
1. C
2. For HC the condition is V
ORDERING INFORMATION
See
December 1990
t
C
C
PHL
Inverting data path
Output capability: standard
I
Quad 2-input multiplexer; inverting
I
PD
SYMBOL
CC
f
f
C
V
For HCT the condition is V
i
o
“74HC/HCT/HCU/HCMOS Logic Package Information”
/ t
CC
PD
= input frequency in MHz
L
category: MSI
= output frequency in MHz
(C
PLH
= output load capacitance in pF
P
= supply voltage in V
is used to determine the dynamic power dissipation (P
L
D
= C
V
amb
CC
PD
2
propagation delay
input capacitance
power dissipation capacitance per multiplexer
= 25 C; t
nI
E to nY
S to nY
V
f
0
o
CC
, nI
) = sum of outputs
2
1
to nY
f
r
i
= t
I
= GND to V
I
f
= GND to V
= 6 ns
(C
PARAMETER
L
V
CC
CC
2
CC
f
o
) where:
1.5 V
2
.
Moving the data from two groups of registers to four
common output buses is a common use of the “158”. The
state of S determines the particular register from which the
data comes. It can also be used as a function generator.
The device is useful for implementing highly irregular logic
by generating any four of the 16 different functions of two
variables with one variable common.
The ”158” is the logic implementation of a 4-pole,
2-position switch, where the position of the switch is
determined by the logic levels applied to S.
The logic equations for the output are:
1Y = E.(1l
2Y = E.(2l
3Y = E.(3l
4Y = E.(4l
The “158” is identical to the “157” but has inverting outputs.
D
in W):
C
notes 1 and 2
L
= 15 pF; V
CONDITIONS
1
1
1
1
.S
.S
.S
.S
1l
2l
3l
4l
0
0
0
0
CC
.S)
.S)
.S)
.S)
= 5 V
12
14
14
3.5
40
HC
74HC/HCT158
TYPICAL
Product specification
13
16
16
3.5
40
HCT
ns
ns
ns
pF
pF
UNIT