Datasheet

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

SDAS143C − APRIL 1982 − REVISED AUGUST 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R
L
= 500 Ω
,
T
A
= MIN to MAX
†
UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN54ALS74A SN74ALS74A
UNIT
MIN MAX MIN MAX
f
max
25 34 MHz
t
PLH
PRE or CLR
Q or Q
3 18 3 13
ns
t
PHL
PRE or CLR Q or Q
5 17 5 15
ns
t
PLH
CLK
Q or Q
5 23 5 16
ns
t
PHL
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, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: 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
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
OH
High-level output current −2 −2 mA
I
OL
Low-level output current 20 20 mA
f
clock
* Clock frequency 0 90 0 105 MHz
PRE or CLR low 4 4
t
w
* Pulse duration
CLK high
4 4
ns
t
w
*
Pulse duration
CLK low 5.5 5.5
ns
t
su
*
Setup time before CLK↑
Data 4.5 4.5
ns
t
su
*
Setup time before CLK↑
PRE
or CLR inactive 2 2
ns
t
h
* Hold time after CLK↑ Data 0 0 ns
T
A
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.