Datasheet
SDAS210C − DECEMBER 1982 − REVISED JULY 1996
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS191A SN74ALS191A
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
= −0.4 mA V
CC
−2 V
CC
−2
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
V
CC
= 5.5 V, V
I
= 7 V 0.2 0.1 mA
I
IH
V
CC
= 5.5 V, V
I
= 2.7 V 20 20 µA
I
IL
CTEN or CLK
V
CC
= 5.5 V,
V
I
= 0.4 V
−0.2 −0.2
mA
I
IL
All others
V
CC
= 5.5 V, V
I
= 0.4 V
−0.2 −0.1
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, All inputs at 0 12 22 12 22 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
.
switching characteristics (see Figure 1)
PARAMETER
FROM
(OUTPUT)
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
(OUTPUT)
(OUTPUT)
SN54ALS191A SN74ALS191A
UNIT
MIN MAX MIN MAX
f
max
20 30 MHz
t
PLH
LOAD
Any Q
7 37 7 30
ns
t
PHL
LOAD
Any Q
8 34 8 30
ns
t
PLH
A, B, C, D
Any Q
3 25 3 21
ns
t
PHL
A, B, C, D
Any Q
4 25 4 21
ns
t
PLH
CLK
RCO
5 24 5 20
ns
t
PHL
CLK
RCO
5 25 5 20
ns
t
PLH
CLK
Any Q
3 26 3 18
ns
t
PHL
CLK Any Q
3 22 3 18
ns
t
PLH
CLK
MAX/MIN
8 37 8 31
ns
t
PHL
CLK MAX/MIN
8 34 8 31
ns
t
PLH
D/U
RCO
8 45 8 37
ns
t
PHL
D/U RCO
10 36 10 28
ns
t
PLH
D/U
MAX/MIN
8 35 8 25
ns
t
PHL
D/U
MAX/MIN
8 30 8 25
ns
t
PLH
CTEN
RCO
4 21 4 18
ns
t
PHL
CTEN
RCO
4 23 4 18
ns
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.