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M54HCT257 Datasheet(PDF) 6 Page - STMicroelectronics

Part # M54HCT257
Description  HCT257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE HCT258 QUAD 2 CHANNEL MULTIPLEXER 3-STATE, INVERTING
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M54HCT257 Datasheet(HTML) 6 Page - STMicroelectronics

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AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
VCC
(V)
TA =25
oC
54HC and 74HC
-40 to 85
oC
74HC
-55 to 125
oC
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tTLH
tTHL
Output Transition
Time
4.5
7
121518
ns
tPLH
tPHL
Propagation
Delay Time
(A, B - Y)
4.5
HCT257
19
30
38
45
ns
HCT258
17
27
34
41
tPLH
tPHL
Propagation
Delay Time
(SELECT - Y)
4.5
20
30
38
45
ns
tPZL
tPZH
Output Enable
Time
4.5
RL =1 K
Ω
18
30
38
45
ns
tPLZ
tPHZ
Output Disable
Time
4.5
RL =1 K
Ω
16
30
38
45
ns
CIN
Input Capacitance
5
10
10
10
pF
COUT
Output
Capacitance
10
pF
CPD (*)
Power Dissipation
Capacitance
HCT257
HCT258
34
33
pF
(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD
•VCC •fIN +ICC/4 (per Channel)
M54/M74HCT257/258
6/12



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