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Электронный компонент: IN74ACT157N

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TECHNICAL DATA
198
Quad 2-Input Data Selector/Multiplexer
High-Speed Silicon-Gate CMOS
The IN74ACT157 is identical in pinout to the LS/ALS157,
HC/HCT157. The IN74ACT157 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.
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 Output Enable input sets all
four Y outputs to a low level.
TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0
A; 0.1
A @ 25
C
Outputs Source/Sink 24 mA
IN74ACT157
ORDERING INFORMATION
IN74ACT157N Plastic
IN74ACT157D SOIC
T
A
= -40
to 85
C for all
packages
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select
Y0-Y3
H
X
L
L
L
A0-A3
L
H
B0-B3
X=don't care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs
LOGIC DIAGRAM
PIN 16 =V
CC
PIN 8 = GND
PIN ASSIGNMENT
IN74ACT157
199
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage (Referenced to GND)
-0.5 to +7.0
V
V
IN
DC Input Voltage (Referenced to GND)
-0.5 to V
CC
+0.5
V
V
OUT
DC Output Voltage (Referenced to GND)
-0.5 to V
CC
+0.5
V
I
IN
DC Input Current, per Pin
20
mA
I
OUT
DC Output Sink/Source Current, per Pin
50
mA
I
CC
DC Supply Current, V
CC
and GND Pins
50
mA
P
D
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
750
500
mW
Tstg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
260
C
*
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
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
V
CC
DC Supply Voltage (Referenced to GND)
4.5
5.5
V
V
IN
, V
OUT
DC Input Voltage, Output Voltage (Referenced to GND)
0
V
CC
V
T
J
Junction Temperature (PDIP)
140
C
T
A
Operating Temperature, All Package Types
-40
+85
C
I
OH
Output Current - High
-24
mA
I
OL
Output Current - Low
24
mA
t
r
, t
f
Input Rise and Fall Time
*
(except Schmitt Inputs)
V
CC
=4.5 V
V
CC
=5.5 V
0
0
10
8.0
ns/V
*
V
IN
from 0.8 V to 2.0 V
This device contains protection circuitry to guard against damage due to high static voltages or electric
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
IN
and V
OUT
should be constrained to the range
GND
(V
IN
or V
OUT
)
V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
).
Unused outputs must be left open.
IN74ACT157
200
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
V
CC
Guaranteed Limits
Symbol
Parameter
Test Conditions
V
25
C
-40
C to
85
C
Unit
V
IH
Minimum High-Level
Input Voltage
V
OUT
=0.1 V or V
CC
-0.1 V
4.5
5.5
2.0
2.0
2.0
2.0
V
V
IL
Maximum Low -
Level Input Voltage
V
OUT
=0.1 V or V
CC
-0.1 V
4.5
5.5
0.8
0.8
0.8
0.8
V
V
OH
Minimum High-Level
Output Voltage
I
OUT
-50
A
4.5
5.5
4.4
5.4
4.4
5.4
V
*
V
IN
=V
IH
or V
IL
I
OH
=-24 mA
I
OH
=-24 mA
4.5
5.5
3.86
4.86
3.76
4.76
V
OL
Maximum Low-Level
Output Voltage
I
OUT
50
A
4.5
5.5
0.1
0.1
0.1
0.1
V
*
V
IN
=V
IL
or V
IH
I
OL
=24 mA
I
OL
=24 mA
4.5
5.5
0.36
0.36
0.44
0.44
I
IN
Maximum Input
Leakage Current
V
IN
=V
CC
or GND
5.5
0.1
1.0
A
I
CCT
Additional Max
I
CC
/Input
V
IN
=V
CC
- 2.1 V
5.5
1.5
mA
I
OLD
+Minimum Dynamic
Output Current
V
OLD
=1.65 V Max
5.5
75
mA
I
OHD
+Minimum Dynamic
Output Current
V
OHD
=3.85 V Min
5.5
-75
mA
I
CC
Maximum Quiescent
Supply Current
(per Package)
V
IN
=V
CC
or GND
5.5
8.0
80
A
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
IN74ACT157
201
AC ELECTRICAL CHARACTERISTICS
(V
CC
=5.0 V
10%, C
L
=50pF,Input t
r
=t
f
=3.0 ns)
Guaranteed Limits
Symbol
Parameter
25
C
-40
C to
85
C
Unit
Min
Max
Min
Max
t
PLH
Propagation Delay, Select to Output Y
(Figure 2)
2.0
9.0
1.5
10.0
ns
t
PHL
Propagation Delay, Select to Output Y
(Figure 2)
2.0
9.5
2.0
10.5
ns
t
PLH
Propagation Delay, Output Enable to
Output Y (Figure 3)
1.5
10
1.5
11.5
ns
t
PHL
Propagation Delay, Output Enable to
Output Y (Figure 3)
1.5
8.5
1.0
9.0
ns
t
PLH
Propagation Delay, Input A or B to Output Y
(Figure 1)
1.5
7.0
1.0
8.5
ns
t
PHL
Propagation Delay, Input A or B to Output Y
(Figure 1)
1.5
7.5
1.0
8.5
ns
C
IN
Maximum Input Capacitance
4.5
4.5
pF
Typical @25
C,V
CC
=5.0 V
C
PD
Power Dissipation Capacitance
50
pF
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
IN74ACT157
202
Figure 3. Switching Waveforms
EXPANDED LOGIC DIAGRAM
A0 B0 A1 B1 A2 B2 A3 B3 OE SELECT
Y0 Y1 Y2 Y3