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M74HC257 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M74HC257
Description  QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC257 Datasheet(HTML) 5 Page - STMicroelectronics

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AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
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)
TA = 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tTLH tTHL Output Transition
Time
2.0
50
25
60
75
90
ns
4.5
7
121519
6.0
6
101315
tPLH tPHL Propagation Delay
Time
(A, B - Y)
2.0
50
45
100
125
150
ns
4.5
13
20
25
30
6.0
11
17
21
26
2.0
150
62
140
175
210
ns
4.5
18
28
35
42
6.0
15
24
30
36
tPLH tPHL Propagation Delay
Time
(SELECT - Y)
2.0
50
45
100
125
150
ns
4.5
13
20
25
30
6.0
11
17
21
26
2.0
150
62
140
175
210
ns
4.5
18
28
35
42
6.0
15
24
30
36
tPZL tPZH High Impedance
Output Enable
Time
2.0
50
RL = 1 K
40
110
140
165
ns
4.5
12
22
28
33
6.0
10
19
24
28
2.0
150
RL = 1 K
57
150
190
225
ns
4.5
17
30
38
45
6.0
14
26
32
38
tPLZ tPHZ High Impedance
Output Disable
Time
2.0
50
RL = 1 K
28
140
175
210
ns
4.5
14
28
35
42
6.0
13
24
30
36
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.
CIN
Input Capacitance
5
101010
pF
COUT
Output
Capacitance
10
pF
CPD
Power Dissipation
Capacitance (note
1)
47
pF


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