M74HC646 Просмотр технического описания (PDF) - STMicroelectronics
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M74HC646
STMicroelectronics
M74HC646 Datasheet PDF : 12 Pages
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M74HC646/648
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC CL
(V) (pF)
Value
TA = 25 oC
-40 to 85 oC
Min. Typ. Max. Min. Max.
Unit
tPLH Propagation Delay Time
tPHL (SELECT - BUS)
2.0
4.5 50
81 170
23 34
215
43
ns
6.0
20 29
37
2.0
4.5 150
98 210
28 42
265
53
ns
6.0
24 36
45
tPZL 3-State Output Enable Time
tPZH (G, DIR)
2.0
4.5 50 RL = 1 KΩ
84 175
24 35
220
44
ns
6.0
20 30
37
2.0
4.5 150 RL = 1 KΩ
102 215
29 43
270
54
ns
6.0
25 37
46
tPLZ Output Disable Time
tPHZ (G, DIR)
2.0
4.5 50 RL = 1 KΩ
60 175
23 35
220
44
ns
6.0
20 30
37
fMAX Maximum Clock Frequency
2.0
4.5 50
6 19
4.8
30 67
24
MHz
6.0
35 79
28
tW(H)
tW(L)
Minimum Clock Pulse Width
2.0
4.5 50
30 75
7
15
95
19
ns
6.0
6
13
16
ts
Minimum Set-up Time
2.0
4.5 50
16 50
4
10
65
13
ns
6.0
3
9
11
th
Minimum Hold Time
2.0
4.5 50
5
5
5
5
ns
6.0
5
5
CIN Input Capacitance
5
10
10 pF
CI/O Bus Terminal Capacitance
10
pF
CPD (*) Power Dissipation Capacitance
for HC646
39
for HC648
38
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/8 (per bit)
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