Datasheet
SCLS169E − DECEMBER 1982 − REVISED APRIL 2004
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HCT74 SN74HCT74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
f
max
4.5 V 27 40 18 22
MHz
f
max
5.5 V 30 46 20 24
MHz
PRE or CLR
Q or Q
4.5 V 21 35 53 44
t
pd
PRE or CLR Q or Q
5.5 V 17 31 48 40
ns
t
pd
CLK
Q or Q
4.5 V 20 28 42 35
ns
CLK
Q or Q
5.5 V 18 25 38 31
t
t
Q or Q
4.5 V 8 15 22 19
ns
t
t
Q or Q
5.5 V 7 14 20 17
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance per flip-flop No load 35 pF
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIME
S
VOLTAGE WAVEFORMS
PULSE DURATIONS
t
h
t
su
1.3 V
1.3 V1.3 V
0.3 V0.3 V
2.7 V 2.7 V
3 V
3 V
0 V
0 V
t
r
t
f
Reference
Input
Data
Input
1.3 V
High-Level
Pulse
1.3 V
3 V
0 V
1.3 V
1.3 V
3 V
0 V
t
w
Low-Level
Pulse
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
1.3 V
1.3 V1.3 V
10%10%
90% 90%
3 V
V
OH
V
OL
0 V
t
r
t
f
Input
In-Phase
Output
1.3 V
t
PLH
t
PHL
1.3 V 1.3 V
10% 10%
90%90%
V
OH
V
OL
t
r
t
f
t
PHL
t
PLH
Out-of-
Phase
Output
Test
Point
From Output
Under Test
C
L
= 50 pF
(see Note A)
LOAD CIRCUIT
NOTES: A. C
L
includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z
O
= 50 Ω, t
r
= 6 ns, t
f
= 6 ns.
C. For clock inputs, f
max
is measured when the input duty cycle is 50%.
D. The outputs are measured one at a time, with one input transition per measurement.
E. t
PLH
and t
PHL
are the same as t
pd
.
Figure 1. Load Circuit and Voltage Waveforms
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