Datasheet
SN54ALS299, SN74ALS299
8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS
WITH 3-STATE OUTPUTS
SDAS220B – DECEMBER 1982 – REVISED DECEMBER 1994
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54ALS299 SN74ALS299
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 out
p
ut current
Q
A′
or Q
H′
–0.4 –0.4
mA
I
OH
High
-
le
v
el
o
u
tp
u
t
c
u
rrent
Q
A
– Q
H
–1 –2.6
mA
I
OL
Low level out
p
ut current
Q
A′
or Q
H′
4 8
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
Q
A
– Q
H
12 24
mA
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
SN54ALS299 SN74ALS299
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
All outputs V
CC
= 4.5 V to 5.5 V, I
OH
= – 0.4 mA V
CC
–2 V
CC
–2
V
OH
Q
A
Q
H
V
CC
=45V
I
OH
= – 1 mA 2.4 3.3
V
Q
A
–
Q
H
V
CC
=
4
.
5
V
I
OH
= – 2.6 mA 2.4 3.2
Q
A′
or Q
H′
V
CC
=45V
I
OL
= 4 mA 0.25 0.4 0.25 0.4
V
OL
Q
A′
or
Q
H′
V
CC
=
4
.
5
V
I
OL
= 8 mA 0.35 0.5
V
V
OL
Q
A
Q
H
V
CC
=45V
I
OL
= 12 mA 0.25 0.4 0.25 0.4
V
Q
A
–
Q
H
V
CC
=
4
.
5
V
I
OL
= 24 mA 0.35 0.5
I
I
A – H
V
CC
=55V
V
I
= 5.5 V 0.1 0.1
mA
I
I
Any others
V
CC
=
5
.
5
V
V
I
= 7 V 0.1 0.1
mA
I
IH
‡
V
CC
= 5.5 V, V
I
= 2.7 V 20 20 µA
I
‡
S0, S1, SR, SL
V
CC
=55V
V
I
=04V
–0.2 –0.2
mA
I
IL
‡
Any others
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.1 –0.1
mA
I
§
Q
A′
or Q
H′
V
CC
=55V
V
O
= 2 25 V
–15 –70 –15 –70
mA
I
O
§
Q
A
– Q
H
V
CC
=
5
.
5
V
,
V
O
=
2
.
25
V
–20 –112 –30 –112
mA
Outputs high 15 28 15 28
I
CC
V
CC
= 5.5 V
Outputs low 22 38 22 38
mA
Outputs disabled 23 40 23 40
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
For I/O ports (Q
A
–Q
H
), the parameters I
IH
and I
IL
include the off-state output current.
§
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.