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Quad 2-Input Data Selector/Multiplexer
High-Speed Silicon-Gate CMOS
The IN74AC157 is identical in pinout to the LS/ALS157,
HC/HCT157. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
outputs.
This device routes 2 nibbles (A or B) to a single port (Y) as
determined by the Select input. The data is presented at the outputs in
noninvertered form. A high level on the Outp ut Enable input sets all
four Y outputs to a low level.
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 2.0 to 6.0 V
•
Low Input Current: 1.0 µA; 0.1µA @ 25°C
•
High Noise Immunity Characteristic of CMOS Devices
•
Outputs Source/Sink 24 mA
TECHNICAL DATA
IN74AC157
ORDERING INFORMATION
IN74AC157N Plastic
IN74AC157D SOIC
TA = -40° to 85° C for all
packages
LOGIC DIAGRAM
PIN 16 =V
PIN 8 = GND
CC
PIN ASSIGNMENT
FUNCTION TABLE
Inputs Outputs
Output
Enable
HXL
LLA0-A3
LHB0-B3
X=don’t care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs
Select Y0-Y3
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IN74AC157
MAXIMUM RATINGS
*
Symbol Parameter Value Unit
V
CC
V
V
OUT
I
IN
I
OUT
I
CC
P
DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V
IN
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
D
SOIC Package+
±
20
±
50
±
50
750
500
Tstg Storage Temperature -65 to +150
T
Lead Temperature, 1 mm from Case for 10 Seconds
L
260
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
mA
mA
mA
mW
°
C
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
CC
VIN, V
T
J
T
A
I
OH
I
OL
tr, t
f
*
VIN from 30% to 70% V
This device c ontains p rote ction ci rcuitr y to guard a gainst damage d ue to high st atic voltages or electr ic
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
GND≤(V
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
Unused outputs must be left open.
DC Supply Voltage (Referenced to GND) 2.0 6.0 V
DC Input Voltage, Output Voltage (Referenced to GND) 0 V
OUT
Junction Temperature (PDIP) 140
Operating Temperature, All Package Types -40 +85
Output Current - High -24 mA
Output Current - Low 24 mA
Input Rise and Fall Time
(except Schmitt Inputs)
IN
or V
OUT
)≤VCC.
CC
*
V
V
V
=3.0 V
CC
=4.5 V
CC
=5.5 V
CC
and V
IN
0
0
0
should be constrained to the range
OUT
150
40
25
CC
V
°
C
°
C
ns/V
CC
).
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IN74AC157
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol Parameter Test Conditions V
V
Minimum High-Level
IH
V
=0.1 V or VCC-0.1 V 3 .0
OUT
Input Voltage
V
Maximum Low -
IL
V
=0.1 V or VCC-0.1 V 3 .0
OUT
Level Input Voltage
V
OH
Minimum High-Level
I
OUT
≤ -50 µA
Output Voltage
*
VIN=VIH or V
IL
IOH=-12 mA
I
=-24 mA
OH
I
=-24 mA
OH
V
OL
Maximum Low-Level
I
OUT
≤ 50 µA
Output Voltage
*
VIN=VIH or V
IL
IOL=12 mA
I
=24 mA
OL
I
=24 mA
OL
I
IN
Maximum Input
VIN=VCC or GND 5.5
Leakage Current
I
OLD
+Minimum Dynamic
V
=1.65 V Max 5.5 75 mA
OLD
Output Current
I
OHD
+Minimum Dynamic
V
=3.85 V Min 5.5 -75 mA
OHD
Output Current
I
CC
Maximum Quiescent
VIN=VCC or GND 5.5 8.0 80
Supply Current
(per Package)
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
Note: I
IN
and I
@ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V V
CC
V
4.5
5.5
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
CC
Guaranteed Limits
25 °C-40
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±
0.1
°
C to
85°C
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±
1.0
CC
Unit
V
V
V
V
µ
A
µ
A
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IN74AC157
AC ELECTRICAL CHARACTERISTICS
(CL=50pF,Input tr=tf=3.0 ns)
Symbol Parameter V
t
PLH
Propagation Delay, Input A or B to Output Y
(Figure 1)
t
PHL
Propagation Delay, Input A or B to Output Y
(Figure 1)
t
t
t
PLH
PHL
PLH
Propagation Delay, Select to Output Y (Figure2)3.3
Propagation Delay, Select to Output Y (Figure2)3.3
Propagation Delay, Output Enable to
Output Y (Figure 3)
t
PHL
Propagation Delay, Output Enable to
Output Y (Figure 3)
C
IN
C
PD
*
Voltage Range 3.3 V is 3.3 V ±0.3 V
Maximum Input Capacitance 5.0 4.5 4 .5 pF
Power Dissipation Capacitance 50 pF
Voltage Range 5.0 V is 5.0 V ±0.5 V
*
V
CC
Guaranteed Limits
25 °C-40
Min Max Min Max
3.3
5.0
3.3
5.0
5.0
5.0
3.3
5.0
3.3
5.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
8.5
6.5
8.0
6.5
11.5
9.0
11.0
8.5
11.5
9.0
11.0
9.0
Typical @25°C,VCC=5.0 V
1.0
1.0
1.0
1.0
1.5
1.5
1.5
1.0
1.5
1.5
1.5
1.0
°
C to
85°C
9.0
7.0
9.0
7.0
13.0
10.0
12.0
9.5
13.0
10.0
12.0
9.5
Unit
ns
ns
ns
ns
ns
ns
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Figure 1. Switching Waveforms Figure 2. Switching Waveforms
Figure 3. Switching Waveforms
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EXPANDED LOGIC DIAGRAM
A0 B0 A1 B1 A2 B2 A3 B3 OE SELECT
IN74AC157
Y0 Y1 Y2 Y3
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