M54HCT245 데이터 시트보기 (PDF) - STMicroelectronics
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M54HCT245
STMicroelectronics
M54HCT245 Datasheet PDF : 11 Pages
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M54/M74HCT245/640/643
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC CL
(V) (pF)
TA = 25 oC
54HC and 74HC
Value
-40 to 85 oC -55 to 125 oC Unit
74HC
54HC
Min. Typ. Max. Min. Max. Min. Max.
tTLH Output Transition 4.5 50
tTHL Time
tPLH Propagation
tPHL Delay Time
4.5 50
4.5 150
7
12
15
18
ns
13 22
28
33
ns
18 30
38
45
ns
tPZL Output Enable
4.5 50 RL = 1KΩ
19 30
38
45
ns
tPZH Time
4.5 150 RL = 1KΩ
24 38
48
57
ns
tPLZ Output Disable
tPHZ Time
4.5 50 RL = 1KΩ
17 30
38
45
ns
CIN
CI/OUT
Input Capacitance
Output
Capacitance
DIR, G
An, Bn
5
10
10
10 pF
13
pF
CPD (*) Power Dissipation
HCT245
41
Capacitance
HCT640/643
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 circuit)
SWITCHING CHARACTERISTICS TEST WAVEFORM
5/11
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