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74AC157 Datasheet(Hoja de datos) 5 Page - STMicroelectronics

No. de Pieza. 74AC157
Descripción  QUAD 2 CHANNEL MULTIPLEXER
Descarga  9 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Con dition s
Value
Unit
VCC
(V)
TA =25
oC-40 to 85 oC
Mi n.
Typ.
Max.
Min .
Max.
CIN
Input Capacitance
5.0
4
pF
CPD
Power Dissipation
Capacitance (note 1)
5.0
TBD
pF
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
• VCC • fIN +ICC/n (per circuit)
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500
Ω, Input tr =tf =3 ns)
Symbol
Parameter
T est Cond iti on
Value
Unit
VCC
(V)
TA =25
oC-40 to 85 oC
Mi n.
Typ.
Max.
Min .
Max.
tPLH
tPHL
Propagation Delay Time
SELECT to Y
3.3
(*)
1.5
6.5
11.0
1.5
12.0
ns
5.0
(**)
1.55.0
8.51.5
9.5
tPLH
tPHL
Propagation Delay Time
STROBE to Y
3.3
(*)
1.5
6.5
11.0
1.5
12.0
ns
5.0
(**)
1.5
5.5
9.0
1.5
10.0
tPLH
tPHL
Propagation Delay Time
A, B to Y
3.3
(*)
1.55.0
8.01.5
9.0
ns
5.0
(**)
1.54.0
6.51.5
7.0
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5V
± 0.5V
TEST CIRCUIT
74AC157
5/9




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