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74VHCT138A Datasheet(PDF) 5 Page - Fairchild Semiconductor

Part No. 74VHCT138A
Description  3-to-8 Decoder/Demultiplexer
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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©1993 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74VHCT138A Rev. 1.2
5
DC Electrical Characteristics
AC Electrical Characteristics
Note:
5. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load. Average operating current can be obtained by the equation:
ICC (Opr.) = CPD • VCC • fIN + ICC
Symbol
Parameter
VCC (V)
Conditions
TA = 25°C
TA = –40°C
to +85°C
Units
Min.
Typ.
Max.
Min.
Max.
VIH
HIGH Level Input Voltage
4.5 – 5.5
2.0
2.0
V
VIL
LOW Level Input Voltage
4.5 – 5.5
0.8
0.8
V
VOH
HIGH Level Output
Voltage
4.5
VIN = VIH
or VIL
IOH = –50µA
4.4
4.5
4.4
V
IOH = –8mA
3.94
3.80
VOL
LOW Level Output
Voltage
4.5
VIN = VIH
or VIL
IOL = 50µA
0.0
0.1
0.1
V
IOL = 8mA
0.36
0.44
IIN
Input Leakage Current
0 – 5.5
VIN = 5.5V or GND
±0.1
±1.0
µA
ICC
Quiescent Supply
Current
5.5
VIN = VCC or GND
4.0
20.0
µA
ICCT
Maximum ICC /Input
5.5
VIN = 3.4V, All other
inputs
= V
CC or GND
1.35
1.50
mA
IOFF
Output Leakage Current
0
VOUT = 5.5V
0.5
5.0
µA
Symbol
Parameter
VCC (V)
Conditions
TA = 25°C
TA = –40°C to
+85°C
Units
Min.
Typ.
Max.
Min.
Max.
tPLH, tPHL
Propagation Delay,
An to On
5.0 ± 0.5
CL = 15pF
7.6
10.4
1.0
12.0
ns
CL = 50pF
8.1
11.4
1.0
13.0
tPLH, tPHL
Propagation Delay,
E3 to On
5.0 ± 0.5
CL = 15pF
6.6
9.1
1.0
10.5
ns
CL = 50pF
7.1
10.1
1.0
11.5
tPLH, tPHL
Propagation Delay,
E1 or E2 to On
5.0 ± 0.5
CL = 15pF
7.0
9.6
1.0
11.0
ns
CL = 50pF
7.5
10.6
1.0
12.0
CIN
Input Capacitance
VCC = Open
4
10
10
pF
CPD
Power Dissipation
Capacitance
(5)
49
pF




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