UNISONIC TECHNOLOGIES CO., LTD
U74AHCT157
QUADRUPLE 2-LINE TO 1-LINE
DATA SELECTOR/
MULTIPLEXER
DESCRIPTION
The
U74AHCT157
is a quadruple 2-line to 1-line data
selector/multiplexer. When
G
is high, all outputs are low. When
G
is low, a 4-bit word is selected from one of two sources and is routed
to the four outputs. The devices provide true data.
CMOS IC
FEATURES
* TTL-Voltage Compatible
* Max t
PD
of 4.1ns from A or B to Y at 5V, C
L
=15pF
* Low Quiescent Current: I
CC
= 2
μA
(MAX) at 5.5V
* ±8 mA output driver at 5V
ORDERING INFORMATION
Ordering Number
Lead Free
U74AHCT157L-P16-R
U74AHCT157L-P16-T
Halogen Free
U74AHCT157G-P16-R
U74AHCT157G-P16-T
Package
TSSOP-16
TSSOP-16
Packing
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
1 of 6
QW-R502-652.A
U74AHCT157
PIN CONFIGURATION
CMOS IC
FUNCTION TABLE
INPUTS
G
H
L
L
L
L
A/
B
X
L
L
H
H
A
X
L
H
X
X
B
X
X
X
L
H
OUTPUTS
Y
L
L
H
L
H
LOGIC DIAGRAM
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U74AHCT157
ABSOLUTE MAXIMUM RATING
(T
A
=25°C ,unless
otherwise specified)
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage Range
V
CC
-0.5~7
V
Input Voltage Range
V
IN
-0.5~7
V
Output Voltage Range
V
OUT
-0.5~V
CC
+0.5
V
Input Clamp Current (V
IN
<0)
I
IK
-20
mA
Output Clamp Current (V
OUT
<0, or V
OUT
>V
CC
)
I
OK
±20
mA
Output Current
I
OUT
±25
mA
V
CC
or GND
Current
I
CC
±50
mA
Storage Temperature
T
STG
-65 ~ +150
°C
Note: 1.
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING COMDITIONS
PARAMETER
Supply Voltage
High-Level Input Voltage
Low-Level Input Voltage
Input Voltage
Output Voltage
High
-
Level Output Current
Low
-
Level Output Current
Input Rise or Fall Times
Operating Temperature
SYMBOL
V
CC
V
IH
V
IL
V
IN
V
OUT
I
OH
I
OL
Δ
t/
Δ
v
T
A
RATINGS
4.5 ~ 5.5
2
0.8
0 ~ 5.5
0 ~ V
CC
-8
8
20
-40 ~ 85
UNIT
V
V
V
V
V
mA
mA
ns/V
℃
ELECTRICAL CHARACTERISTICS
(T
A
=25°C , unless otherwise specified)
PARAMETER
Output Voltage High-Level
Output Voltage Low-Level
Input Leakage Current
Quiescent Supply Current
Additional quiescent supply current
Input Capacitance
SYMBOL
V
OH
V
OL
I
I(LEAK)
I
CC
Δ
I
CC
C
I
TEST CONDITIONS
V
CC
=4.5V, I
OH
=-50μA
V
CC
=4.5V, I
OH
=-8mA
V
CC
=4.5V, I
OL
=50μA
V
CC
=4.5V, I
OL
=8mA
V
CC
=0V to 5.5V,
V
IN
=0 or 5.5V
V
CC
=5.5V,
V
IN
=V
CC
or GND, I
OUT
=0
V
CC
=5.5V, one input at 3.4V,
Other inputs at V
CC
or GND
V
CC
=5V,
V
IN
=V
CC
or GND
MIN
4.4
3.94
TYP
4.5
MAX
UNIT
V
0.1
0.36
±0.1
2
1.35
2
10
V
μA
μA
mA
pF
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U74AHCT157
SWITCHING CHARACTERISTICS
(V
CC
= 5V ± 0.5V, T
A
=25°C)
PARAMETER
Propagation delay from input A or B
to output Y, t
PD
SYMBOL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
CMOS IC
Propagation delay from input
A /
B
to output Y, t
PD
Propagation delay from input
G
to
output Y, t
PD
TEST CONDITIONS
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
MIN
TYP
4.1
5.6
4.1
5.6
5.3
6.8
5.3
6.8
5.6
7.1
5.6
7.1
MAX
6.4
8.7
6.4
8.7
8.1
10.4
8.1
10.4
8.6
11
8.6
11
UNIT
ns
ns
ns
ns
ns
ns
OPERATING CHARACTERISTICS
(T
A
=25°C)
PARAMETER
Power dissipation capacitance
SYMBOL
TEST CONDITIONS
C
PD
V
CC
= 5V, f=1MHz, No load
RATINGS
11
UNIT
pF
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U74AHCT157
TEST CIRCUIT AND WAVEFORMS
CMOS IC
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
V
LOAD
GND
V
CC
5V±0.5V
Input
V
IN
V
CC
t
R
, t
F
≤3ns
V
M
V
CC
/2
V
LOAD
V
CC
C
L
15pF
50pF
R
L
1kΩ
V
Δ
0.5V
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