Datasheet
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272A – NOVEMBER 1994 – REVISED JANUARY 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 2)
SN54ALS245A SN74ALS245A
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 –12 –15 mA
I
OL
Low level out
p
ut current
12 24
mA
I
OL
Low
-
level
output
current
48
†
mA
T
A
Operating free-air temperature –55 125 0 70 °C
†
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V
NOTE 2: All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS245A SN74ALS245A
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
CC
= 4.5 V to 5.5 V, I
OH
= –0.4 mA V
CC
–2 V
CC
–2
V
OH
I
OH
= –3 mA 2.4 3.2 2.4 3.2
V
V
OH
V
CC
= 4.5 V
I
OH
= –12 mA 2
V
I
OH
= –15 mA 2
I
OL
= 12 mA 0.25 0.4 0.25 0.4
V
OL
V
CC
= 4.5 V
I
OL
= 24 mA
0.35 0.5
V
I
OL
= 48 mA
†
0.35 0.5
I
I
Control inputs
V
CC
=55V
V
I
= 7 V 0.1 0.1
mA
I
I
A or B ports
V
CC
=
5
.
5
V
V
I
= 5.5 V 0.1 0.1
mA
I
IH
Control inputs
V
CC
=55V
V
I
=27V
20 20
µA
I
IH
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
2
.
7
V
20 20
µ
A
I
IL
Control inputs
V
CC
=55V
V
I
=04V
–0.1 –0.1
mA
I
IL
A or B ports
§
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.1 –0.1
mA
I
O
¶
V
CC
= 5.5 V, V
O
= 2.25 V –20 –112 –30 –112 mA
Outputs high 30 48 30 45
I
CC
V
CC
= 5.5 V
Outputs low 36 60 36 55
mA
Outputs disabled 38 63 38 58
†
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V
‡
All typical values are V
CC
= 5 V, T
A
= 25°C.
§
For I/O ports, 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
.