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SN54ALS74A Datasheet(PDF) 4 Page - Texas Instruments

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Part No. SN54ALS74A
Description  DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH CLEAR AND PRESET
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN54ALS74A, SN54AS74A, SN74ALS74A, SN74AS74A
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SDAS143C – APRIL 1982 – REVISED AUGUST 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX†
UNIT
(INPUT)
(OUTPUT)
SN54ALS74A
SN74ALS74A
MIN
MAX
MIN
MAX
fmax
25
34
MHz
tPLH
PRE or CLR
QorQ
3
18
3
13
ns
tPHL
PRE or CLR
Q or Q
5
17
5
15
ns
tPLH
CLK
QorQ
5
23
5
16
ns
tPHL
CLK
Q or Q
5
20
5
18
ns
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN54AS74A
– 55
°C to 125°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74AS74A
0
°C to 70°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
– 65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54AS74A
SN74AS74A
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IOH
High-level output current
–2
–2
mA
IOL
Low-level output current
20
20
mA
fclock*
Clock frequency
0
90
0
105
MHz
PRE or CLR low
4
4
tw*
Pulse duration
CLK high
4
4
ns
CLK low
5.5
5.5
t
*
Set p time before CLK
Data
4.5
4.5
ns
tsu*
Setup time before CLK
PRE or CLR inactive
2
2
ns
th*
Hold time after CLK
Data
0
0
ns
TA
Operating free-air temperature
–55
125
0
70
°C
* On products compliant to MIL-STD-833, Class B, this parameter is based on characterization data but is not production tested.




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