Datasheet
SDAS143C − APRIL 1982 − REVISED AUGUST 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
recommended operating conditions
SN54ALS74A SN74ALS74A
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 25 0 34 MHz
PRE or CLR low 15 15
t
w
Pulse duration
CLK high
17.5 14.5
ns
t
w
Pulse duration
CLK low 17.5 14.5
ns
t
su
Setup time before CLK↑
Data 16 15
ns
t
su
Setup time before CLK↑
PRE
or CLR inactive 10 10
ns
t
h
Hold time after CLK↑ Data 2 0 ns
T
A
Operating free-air temperature −55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS74A SN74ALS74A
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= −18 mA −1.5 −1.5 V
V
OH
V
CC
= 4.5 V to 5.5 V, I
OH
= −2 mA V
CC
−2 V
CC
−2 V
V
OL
V
CC
= 4.5 V
I
OL
= 4 mA 0.25 0.4 0.25 0.4
V
V
OL
V
CC
= 4.5 V
I
OL
= 8 mA 0.35 0.5
V
I
I
CLK or D
V
CC
= 4.5 V,
V
I
= 7 V
0.1 0.1
mA
I
I
PRE or CLR
V
CC
= 4.5 V, V
I
= 7 V
0.2 0.2
mA
I
IH
CLK or D
V
CC
= 4.5 V,
V
I
= 2.7 V
20 20
A
I
IH
PRE or CLR
V
CC
= 4.5 V, V
I
= 2.7 V
40 40
µA
I
IL
CLK or D
V
CC
= 4.5 V,
V
I
= 0.4 V
−0.2 −0.2
mA
I
IL
PRE or CLR
V
CC
= 4.5 V, V
I
= 0.4 V
−0.4 −0.4
mA
I
O
‡
V
CC
= 5.5 V, V
O
= 2.25 V −20 −112 −30 −112 mA
I
CC
V
CC
= 5.5 V, See Note 1 2.4 4 2.4 4 mA
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.
NOTE 1: I
CC
is measured with D, CLK, and PRE
grounded, then with D, CLK, and CLR grounded.