Datasheet

SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω
,
R2 = 500 Ω,
T
A
= MIN to MAX
†
UNIT
SN74ALS620A SN74ALS623A
MIN MAX MIN MAX
t
PLH
A
B
2 10 2 13
ns
t
PHL
A
B
2 10 3 11
ns
t
PLH
B
A
2 10 2 13
ns
t
PHL
B
A
2 10 3 11
ns
t
PZH
OEBA
A
3 17 5 22
ns
t
PZL
OEBA
A
5 25 5 22
ns
t
PHZ
OEBA
A
2 12 2 16
ns
t
PLZ
OEBA
A
3 18 2 19
ns
t
PZH
OEAB
B
3 18 5 22
ns
t
PZL
OEAB
B
5 25 5 22
ns
t
PHZ
OEAB
B
2 12 2 16
ns
t
PLZ
OEAB
B
3 18 2 19
ns
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
: All inputs and I/O ports 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN74ALS621A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –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
SN74ALS621A
UNIT
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
V
OH
High-level output voltage 5.5 V
I
OL
Low level out
p
ut current
24 mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
48
§
mA
T
A
Operating free-air temperature 0 70 °C
§
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V