December 1990
2
Philips Semiconductors
Product specification
Dual 4-input multiplexer
74HC/HCT153
FEATURES
•
Non-inverting output
•
Separate enable for each output
•
Common select inputs
•
See ‘253” for 3-state version
•
Permits multiplexing from n lines to
1 line
•
Enable line provided for cascading
(n lines to 1 line)
•
Output capability: standard
•
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT153 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/HCT153 have two
identical 4-input multiplexers which
select two bits of data from up to four
sources selected by common data
select inputs (S
0
, S
1
). The two 4-input
multiplexer circuits have individual
active LOW output enable inputs (1E,
2E) which can be used to strobe the
outputs independently. The outputs
(1Y, 2Y) are forced LOW when the
corresponding output enable inputs
are HIGH.
The “153” is the logic implementation
of a 2-pole, 4-position switch, where
the position of the switch is
determined by the logic levels applied
to S
0
and S
1
.
The logic equations for the outputs
are:
1Y = 1E.(1I
0
.S
1
.S
0
+1I
1
.S
1
.S
0
+
+1I
2
.S
1
.S
0
+1I
3
.S
1
.S
0
)
2Y = 2E.(2I
0
.S
1
.S
0
+2I
1
.S
1
.S
0
+
+2I
2
.S
1
.S
0
+2I
3
.S
1
.S
0
)
The “153” can be used to move data
to a common output bus from a group
of registers. The state of the select
inputs would determine the particular
register from which the data came. An
alternative application is a function
generator. The device can generate
two functions or three variables. This
is useful for implementing highly
irregular random logic.
The “153” is similar to the “253” but
has standard outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay
C
L
= 15 pF; V
CC
= 5 V
1I
n
, 2I
n
to nY
14
16
ns
S
n
to nY
15
17
ns
nE to nY
10
11
ns
C
I
input capacitance
3.5
3.5
pF
C
PD
power dissipation capacitance per multiplexer notes 1 and 2
30
30
pF
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µ
W):
P
D
= C
PD
×
V
CC
2
×
f
i
+
∑
(C
L
×
V
CC
2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
∑
(C
L
×
V
CC
2
×
f
o
) = sum of outputs
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
−
1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic
Package Information”
.
December 1990
6
Philips Semiconductors
Product specification
Dual 4-input multiplexer
74HC/HCT153
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard
I
CC
category: MSI
Note to HCT types
The value of additional quiescent supply current (
∆
I
CC
) for a unit load of 1 is given in the family specifications.
To determine
∆
I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
INPUT
UNIT LOAD COEFFICIENT
1I
n
, 2I
n
nE
S
n
0.45
0.60
1.35
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+25
−
40 to+85
−
40 to+125
min.
typ.
max.
min.
max.
min.
max.
t
PHL
propagation delay
1I
n
to nY;
2I
n
to nY
19
34
43
51
ns
4.5
Fig.6
t
PLH
propagation delay
1I
n
to nY;
2I
n
to nY
13
24
30
36
ns
4.5
Fig.6
t
PHL
/ t
PLH
propagation delay
S
n
to nY
20
34
43
51
ns
4.5
Fig.7
t
PHL
/ t
PLH
propagation delay
nE to nY
14
27
34
41
ns
4.5
Fig.7
t
THL
/ t
TLH
output transition time
7
15
19
22
ns
4.5
Figs 6 and 7
December 1990
7
Philips Semiconductors
Product specification
Dual 4-input multiplexer
74HC/HCT153
AC WAVEFORMS
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
Fig.6 Waveforms showing the input (1I
n
, 2I
n
) to output (1Y, 2Y) propagation delays and the output transition times.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.7
Waveforms showing the select input (S
0
, S
1
) and the output enable input (E) to output (1Y, 2Y)
propagation delays and the output transition times.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
