M54/M74HCT240/241/244
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
7
12
15
18
ns
tPLH Propagation
tPHL Delay Time
4.5 50
4.5 150
15 22
28
33
ns
21 30
38
45
ns
tPLH Propagation
tPHL Delay Time
4.5 50
4.5 150
15 25
31
38
ns
21 33
41
50
ns
tPZL Output Enable
4.5 50 RL = 1KΩ
17 30
38
45
ns
tPZH Time
4.5 150 RL = 1KΩ
23 38
48
57
ns
tPLZ Output Disable
4.5 50 RL = 1KΩ
16 30
38
45
ns
tPHZ Time
CIN Input Capacitance
5
10
10
10 pF
COUT Output
10
pF
Capacitance
CPD (*) Power Dissipation
HCT240
33
Capacitance
HCT241/244
31
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)
TEST CIRCUIT ICC (Opr.)
HCT 24 0
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