M74HC243 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
M74HC243 Datasheet PDF : 11 Pages
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M54/M74HC242/243
AC ELECTRICAL CHARACTERISTICS (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 2.0
tTHL Time
4.5 50
25 60
75
90
7
12
15
18
ns
6.0
6
10
13
15
tPLH Propagation
tPHL Delay Time
2.0
4.5 50
39 90
13 18
115
135
23
27
ns
6.0
11 15
20
23
2.0
4.5 150
51 145
180
220
17 29
36
44
ns
6.0
14 25
31
37
tPZL 3 State Output
2.0
57 145
180
220
tPZH Enable Time
4.5 50 RL = 1 KΩ
18 29
36
44
ns
6.0
15 25
31
37
2.0
70 175
220
265
4.5 150 RL = 1 KΩ
22 35
44
53
ns
6.0
19 30
37
45
tPLZ 3 State Output
2.0
45 150
190
225
tPHZ Disable Time
4.5 50 RL = 1 KΩ
20 30
38
45
ns
6.0
17 26
32
38
CIN
CPD (*)
Input Capacitance
Power Dissipation
Capacitance
for HC242
for HC243
5
10
10
10 pF
30
35
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
SWITCHING CHARACTERISTICS TEST WAVEFORM
5/11
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