Datasheet
SDAS210C − DECEMBER 1982 − REVISED JULY 1996
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
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
: SN54ALS191A −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS191A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−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
SN54ALS191A SN74ALS191A
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 0.7 0.8 V
I
OH
High-level output current −0.4 −0.4 mA
I
OL
Low-level output current 4 8 mA
f
clock
Clock frequency 0 20 0 30 MHz
t
w
Pulse duration
CLK high or low 20 16.5
ns
t
w
Pulse duration
LOAD
low 25 20
ns
Data before LOAD↑ 25 20
t
su
Setup time
CTEN before CLK↑ 45 20
ns
t
su
Setup time
D/U
before CLK↑ 30 20
ns
LOAD inactive before CLK↑ 20 20
Data after LOAD↑ 5 5
t
h
Hold time CTEN after CLK↑ 0 0
ns
D/U after CLK↑ 0 0
ns
T
A
Operating free-air temperature −55 125 0 70 °C