M74HCT646 查看數據表（PDF） - STMicroelectronics
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M74HCT646 Datasheet PDF : 15 Pages
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M74HCT646
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Value
Symbol
Parameter
tTLH tTHL Output Transition
Time
tPLH tPHL Propagation Delay
Time
tPLH tPHL Propagation Delay
Time(CLOCK-A,B)
tPLH tPHL Propagation Delay
Time (SELECT -
A,B)
tPZL tPZH High Impedance
Output Enable
Time (G, DIR)
tPLZ tPHZ High Impedance
Output Disable
Time (G, DIR)
fMAX Maximum Clock
Frequency
tW(H)
tW(L)
Minimum Pulse
Width
ts Minimum Set-Up
Time
th Minimum Hold
Time
VCC CL
(V) (pF)
4.5 50
50
4.5
150
50
4.5
150
50
4.5
150
50
4.5
150
4.5 50
4.5 50
4.5 50
4.5 50
4.5 50
RL = 1 KΩ
RL = 1 KΩ
RL = 1 KΩ
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
7 12
15
19 ns
20 30
38
48
ns
25 38
48
60
29 44
55
65
ns
34 52
65
75
24 34
43
53
ns
29 42
53
65
26 38
48
60
ns
31 46
58
70
26 35
44
55 ns
31 55
25
20
MHz
8
15
19
ns
3 10
13
13 ns
5
5
5 ns
CAPACITIVE CHARACTERISTICS
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
CIN Input Capacitance
5 10
10
10 pF
CI/O
Bus Terminal
Capacitance
13
pF
CPD Power Dissipation
Capacitance (note
40
pF
1)
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/8 (per bit)
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