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74AC138B Datasheet(PDF) 5 Page - STMicroelectronics

No. de pieza 74AC138B
Descripción Electrónicos  3 TO 8 LINE DECODER INVERTING
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74AC138B Datasheet(HTML) 5 Page - STMicroelectronics

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74AC138
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AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns)
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5.0V
± 0.5V
CAPACITIVE CHARACTERISTICS
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/n (per circuit)
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tPLH tPHL Propagation Delay
Time
A, B, C to Y
3.3(*)
1.5
5.5
10.5
1.5
14.0
1.5
15.4
ns
5.0(**)
1.5
4.5
9.0
1.5
10.0
1.5
11.0
tPLH tPHL Propagation Delay
Time
G1 to Y
3.3(*)
1.5
6.0
10.5
1.5
14.0
1.5
15.4
ns
5.0(**)
1.5
4.5
11.0
1.5
10.0
1.5
11.0
tPLH tPHL Propagation Delay
Time
G2A or G2B to Y
3.3(*)
1.5
5.5
10.5
1.5
12.7
1.5
14.0
ns
5.0(**)
1.5
4.5
9.0
1.5
10.0
1.5
10.0
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
CIN
Input Capacitance
5.0
4
pF
CPD
Power Dissipation
Capacitance
(note 1)
5.0
fIN = 10MHz
60
pF


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