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74VHC157 Datasheet(PDF) 5 Page - STMicroelectronics

Part # 74VHC157
Description  QUAD 2 CHANNEL MULTIPLEXER
Download  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC157 Datasheet(HTML) 5 Page - STMicroelectronics

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Table 8: 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/4 (per
channel)
Table 9: Dynamic Switching Characteristics
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold
(VIHD), f=1MHz.
Figure 4: Test Circuit
CL =15/50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
Symbol
Parameter
Test Condition
Value
Unit
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
CIN
Input Capacitance
610
10
10
pF
CPD
Power Dissipation
Capacitance
(note 1)
18
pF
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.
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
3.5
V
VILD
Dynamic Low
Voltage Input
(note 1, 3)
5.0
1.5
V


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