Datasheet

AC ELECTRICAL CHARACTERISTICS (C
L
=50pF,Inputt
r
=t
f
=6ns)
Symbol Parameter
Test Conditions Value
Unit
V
CC
(V)
C
L
(pF)
T
A
=25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min. Typ. Max. Min. Max. Min. Max.
t
TLH
t
THL
Output Transition
Time
4.5 50 7 12 15 18 ns
t
PLH
t
PHL
Propagation
Delay Time
4.5 50 15 22 28 33 ns
4.5 150 21 30 38 45 ns
t
PLH
t
PHL
Propagation
Delay Time
4.5 50 15 25 31 38 ns
4.5 150 21 33 41 50 ns
t
PZL
t
PZH
Output Enable
Time
4.5 50 R
L
=1KΩ 17 30 38 45 ns
4.5 150 R
L
=1KΩ 23 38 48 57 ns
t
PLZ
t
PHZ
Output Disable
Time
4.5 50 R
L
=1KΩ 16 30 38 45 ns
C
IN
Input Capacitance 5 10 10 10 pF
C
OUT
Output
Capacitance
10 pF
C
PD
(*) Power Dissipation
Capacitance
HCT240
HCT241/244
33
31
pF
(*) C
PD
isdefined 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. I
CC
(opr) = C
PD
•V
CC
•f
IN
+I
CC
/8 (per circuit)
TEST CIRCUIT I
CC
(Opr.)
HCT240
M54/M74HCT240/241/244
6/12