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74VHC257 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. 74VHC257
Description  QUAD 2 CHANNEL MULTIPLEXER 3-STATE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC257 Datasheet(HTML) 5 Page - STMicroelectronics

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Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5.0V
± 0.5V
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)
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
CL
(pF)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tPLH
tPHL
Propagation Delay
Time A, B to Y
3.3(*)
15
5.8
9.3
1.0
11.0
1.0
11.0
ns
3.3(*)
50
8.3
12.8
1.0
14.5
1.0
14.5
5.0(**)
15
3.6
5.9
1.0
7.0
1.0
7.0
5.0(**)
50
5.1
7.9
1.0
9.0
1.0
9.0
tPLH
tPHL
Propagation Delay
Time
SELECT to Y
3.3(*)
15
7.0
11.0
1.0
13.0
1.0
13.0
ns
3.3(*)
50
9.5
14.5
1.0
16.5
1.0
16.5
5.0(**)
15
4.0
6.8
1.0
8.0
1.0
8.0
5.0(**)
50
5.5
8.8
1.0
10.0
1.0
10.0
tPZL
tPZH
Output Enable
Time
3.3(*)
15
RL = 1K
6.7
10.5
1.0
12.5
1.0
12.5
ns
3.3(*)
50
RL = 1K
9.2
14.0
1.0
16.0
1.0
16.0
5.0(**)
15
RL = 1K
3.6
6.8
1.0
8.0
1.0
8.0
5.0(**)
50
RL = 1K
5.1
8.8
1.0
10.0
1.0
10.0
tPLZ
tPHZ
Output Disable
Time
3.3(*)
50
RL = 1K
8.6
12.0
1.0
13.5
1.0
13.5
ns
5.0(**)
50
RL = 1K
5.7
7.9
1.0
9.0
1.0
9.0
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
COUT
Output
Capacitance
8pF
CPD
Power Dissipation
Capacitance
(note 1)
18
pF


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