Datasheet

SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74ALS621A
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
†
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.5 V
I
OH
V
CC
= 4.5 V, V
OH
= 5.5 V 0.1 mA
V
OL
V
CC
=45V
I
OL
= 24 mA 0.35 0.5
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 48 mA
‡
0.35 0.5
V
I
I
Control inputs
V
CC
=55V
V
I
= 7 V 0.1
mA
I
I
A or B ports
V
CC
=
5
.
5
V
V
I
= 5.5 V 0.1
mA
I
IH
Control inputs
V
CC
=55V
V
I
=27V
20
µA
I
IH
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
2
.
7
V
20
µ
A
I
IL
Control inputs
V
CC
=55V
V
I
=04V
–0.1
mA
I
IL
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.1
mA
I
CC
V
CC
=55V
Outputs high 29 40
mA
I
CC
V
CC
=
5
.
5
V
Outputs low 35 48
mA
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V
§
For I/O ports, the parameters I
IH
and I
IL
include the off-state output current.
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
= 680 Ω
,
T
A
= MIN to MAX
¶
UNIT
(INPUT)
(OUTPUT)
SN74ALS621A
MIN MAX
t
PLH
A
B
10 33
ns
t
PHL
A
B
5 20
ns
t
PLH
B
A
10 33
ns
t
PHL
B
A
5 20
ns
t
PLH
OEBA
A
10 39
ns
t
PHL
OEBA
A
12 35
ns
t
PLH
OEAB
B
10 39
ns
t
PHL
OEAB
B
12 35
ns
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.