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74VHCT257A Datasheet(PDF) 5 Page - STMicroelectronics

Part No. 74VHCT257A
Description  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHCT257A Datasheet(HTML) 5 Page - STMicroelectronics

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CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Val ue
Un it
TA =25
oC
-40 to 85
oC
Min.
Typ .
Max.
Min .
Max.
CIN
Input Capacitance
4
10
10
pF
COUT
Output Capacitance
6
pF
CPD
Power Dissipation
Capacitance (note 1)
23
pF
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD
• VCC • fIN +ICC/4 (per Channel)
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Val ue
Un it
VCC
(V)
TA =25
oC
-40 to 85
oC
Min.
Typ .
Max.
Min .
Max.
VOLP
Dynamic Low Voltage
Quiet Output (note 1, 2)
5.0
CL =50 pF
0.3
0.8
V
VOLV
-0.8
-0.3
VIHD
Dynamic High Voltage
Input (note 1, 3)
5.0
2.0
VILD
Dynamic Low Voltage
Input (note 1, 3)
5.0
0.8
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n -1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
TEST CIRCUIT
T EST
SW IT CH
tPLH,tPHL
Open
tPZL,tPLZ
VCC
tPZH,tPHZ
GND
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RL =R1 =1K
Ω orequivalent
RT =ZOUT of pulse generator (typically 50
Ω)
74VHCT257A
5/9


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