M74HCT646 查看數據表（PDF） - STMicroelectronics
零件编号
产品描述 (功能)
比赛名单
M74HCT646
STMicroelectronics
M74HCT646 Datasheet PDF : 12 Pages
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M74HCT646/648
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
54HC and 74HC
74HC
Unit
Min. Typ. Max. Min. Max.
tTLH Output Transition Time
tTHL
4.5 50
7
12
15
ns
tPLH Propagation Delay Time
tPHL (BUS - BUS)
4.5 50
4.5 150
20 30
25 38
38
ns
48
ns
tPLH Propagation Delay Time
tPHL (CLOCK - BUS)
4.5 50
4.5 150
29 44
34 52
55
ns
65
ns
tPLH Propagation Delay Time
tPHL (SELECT - BUS)
4.5 50
4.5 150
24 34
29 42
43
ns
53
ns
tPZL 3-State Output Enable Time
tPZH (G, DIR - BUS)
4.5 50 RL = 1 KΩ
4.5 150 RL = 1 KΩ
26 38
31 46
48
ns
58
ns
tPLZ 3-State Output Disable Time
tPHZ (G, DIR - BUS)
4.5 50 RL = 1 KΩ
26 35
44
ns
fMAX Maximum Clock Frequency
4.5 50
31 55
25
MHz
tW(H)
tW(L)
Minimum Pulse Width
4.5 50
8
15
19
ns
ts
Minimum Set-up Time
4.5 50
3
10
13
ns
th
Minimum Hold Time
4.5 50
5
5
ns
CIN Input Capacitance
5
10
10 pF
CI/O Bus Terminal Capacitance
13
pF
CPD (*) Power Dissipation Capacitance
for HCT646
40
for HCT648
39
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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