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SN54HCT74 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. SN54HCT74
Description  DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS WITH CLEAR AND PRESET
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54HCT74 Datasheet(HTML) 4 Page - Texas Instruments

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SN54HCT74, SN74HCT74
DUAL DTYPE POSITIVEEDGETRIGGERED FLIPFLOPS
WITH CLEAR AND PRESET
SCLS169E − DECEMBER 1982 − REVISED APRIL 2004
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25°C
SN54HCT74
SN74HCT74
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
4.5 V
27
40
18
22
MHz
fmax
5.5 V
30
46
20
24
MHz
PRE or CLR
Q or Q
4.5 V
21
35
53
44
tpd
PRE or CLR
Q or Q
5.5 V
17
31
48
40
ns
tpd
CLK
Q or Q
4.5 V
20
28
42
35
ns
CLK
Q or Q
5.5 V
18
25
38
31
tt
Q or Q
4.5 V
8
15
22
19
ns
tt
Q or Q
5.5 V
7
14
20
17
ns
operating characteristics, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per flip-flop
No load
35
pF
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
th
tsu
1.3 V
1.3 V
1.3 V
0.3 V
0.3 V
2.7 V
2.7 V
3 V
3 V
0 V
0 V
tr
tf
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
tw
Low-Level
Pulse
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
1.3 V
1.3 V
1.3 V
10%
10%
90%
90%
3 V
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
1.3 V
tPLH
tPHL
1.3 V
1.3 V
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-
Phase
Output
Test
Point
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
NOTES: A. CL 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, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
C. For clock inputs, fmax 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. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.


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