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74ACT257B 数据表(PDF) 5 Page - STMicroelectronics

部件名 74ACT257B
功能描述  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
PDF  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

74ACT257B 数据表(HTML) 5 Page - STMicroelectronics

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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
A, B to Y
5.0
(*)
5.0
7.0
8.0
ns
tPLH
tPHL
Propagation Delay Time
SEL to Y
5.0
(*)
6.0
9.0
10.0
ns
tPZL
tPZH
Output Enable Time
5.0
(*)
5.0
8.0
9.0
ns
tPLZ
tPHZ
Output Disable Time
5.0
(*)
6.0
9.0
10.0
ns
(*) Voltage range is 5V
± 0.5V
TEST CIRCUIT
TEST
SWI TCH
tPLH,tPHL
Open
tPZL,tPLZ
2VCC
tPZH,tPHZ
Open
CL = 50 pF or equivalent (includes jig and probe capacitance)
RL =R1 = 500
Ω or equivalent
RT =ZOUT of pulse generator (typically 50
Ω)
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
COUT
Input Capacitance
5.0
8
pF
CPD
Power Dissipation
Capacitance (note 1)
5.0
31
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)
74ACT257
5/10



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