74HC_HCT74 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 4 — 27 August 2012 9 of 21
NXP Semiconductors
74HC74; 74HCT74
Dual D-type flip-flop with set and reset; positive edge-trigger
[1] All typical values are measured at T
amb
=25C.
[2] t
pd
is the same as t
PLH
and t
PHL
.
[3] t
t
is the same as t
THL
and t
TLH
.
[4] C
PD
is used to determine the dynamic power dissipation (P
D
in W).
P
D
=C
PD
V
CC
2
f
i
N+(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
(C
L
V
CC
2
f
o
) = sum of outputs.
t
h
hold time nD to nCP; see Figure 7
V
CC
= 4.5 V 3 3- 3 -ns
f
max
maximum
frequency
nCP; see Figure 7
V
CC
= 4.5 V 22 54 - 18 - MHz
V
CC
=5V; C
L
=15pF - 59 - - - MHz
C
PD
power
dissipation
capacitance
C
L
=50pF;f=1 MHz;
V
I
=GNDtoV
CC
- 1.5 V
[4]
-29 - - -pF
Table 8. Dynamic characteristics
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF unless otherwise specified; for test circuit see Figure 9.
Symbol Parameter Conditions T
amb
= 40 C to +85 C T
amb
= 40 C to +125 C Unit
Min Typ
[1]
Max Min Max
