Datasheet
SN54ACT245, SN74ACT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS452E – SEPTEMBER 1994 – REVISED OCTOBER 2002
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54ACT245 SN74ACT245
UNIT
MIN MAX MIN MAX
UNIT
V
CC
Supply voltage 4.5 5.5 4.5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
V
I
Input voltage 0 V
CC
0 V
CC
V
V
O
Output voltage 0 V
CC
0 V
CC
V
I
OH
High-level output current –24 –24 mA
I
OL
Low-level output current 24 24 mA
t/ v Input transition rise or fall rate 8 8 ns/V
T
A
Operating free-air temperature –55 125 –40 85 °C
NOTE 3: 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
V
CC
T
A
= 25°C SN54ACT245 SN74ACT245
UNIT
PARAMETER
TEST
CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
I
OH
= 50 A
4.5 V 4.4 4.49 4.4 4.4
I
OH
= –
50
A
5.5 V 5.4 5.49 5.4 5.4
V
OH
I
OH
= 24 mA
4.5 V 3.88 3.7 3.76
V
V
OH
I
OH
= –
24
mA
5.5 V 4.86 4.7 4.76
V
I
OH
= –50 mA
†
5.5 V 3.85
I
OH
= –75 mA
†
5.5 V 3.85
I
OL
=50 A
4.5 V 0.001 0.1 0.1 0.1
I
OL
=
50
A
5.5 V 0.001 0.1 0.1 0.1
V
OL
I
OL
=24mA
4.5 V 0.36 0.5 0.44
V
V
OL
I
OL
=
24
mA
5.5 V 0.36 0.5 0.44
V
I
OL
= 50 mA
†
5.5 V 1.65
I
OL
= 75 mA
†
5.5 V 1.65
I
OZ
A or B ports
‡
V
O
= V
CC
or GND 5.5 V ±0.5 ±10 ±5 A
I
I
OE or DIR V
I
= V
CC
or GND 5.5 V ±0.1 ±1 ±1 A
I
CC
V
I
= V
CC
or GND, I
O
= 0 5.5 V 4 80 40 A
I
CC
§
One input at 3.4 V,
Other inputs at GND or V
CC
5.5 V 0.6 1.6 1.5 mA
C
i
V
I
= V
CC
or GND 5 V 4.5 pF
C
io
V
O
= V
CC
or GND 5 V 15 pF
†
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
‡
For I/O ports, the parameter I
OZ
includes the input leakage current.
§
This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V
CC
.