Datasheet
SN74AHCT245
SN54AHCT245
www.ti.com
SCLS233O –OCTOBER 1995–REVISED AUGUST 2013
RECOMMENDED OPERATING CONDITIONS
(1)
SN54AHCT245 SN74AHCT245
UNIT
MIN MAX MIN MAX
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 5.5 0 5.5 V
V
O
Output voltage 0 V
CC
0 V
CC
V
I
OH
High-level output current –8 –8 mA
I
OL
Low-level output current 8 8 mA
Δt/Δv Input Transition rise or fall rate 20 20 ns/V
T
A
Operating free-air temperature –55 125 –40 125 °C
(1) 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 operating free-air temperature range (unless otherwise noted)
Recommended
SN54AHCT245 SN74AHCT245
T
A
= 25°C SN74AHCT245
–55°C TO 125°C –40°C TO 85°C
PARAMETER TEST CONDITIONS V
CC
UNIT
–40°C TO 125°C
MIN TYP MAX MIN MAX MIN MAX MIN MAX
I
OH
= –50 µA 4.4 4.5 4.4 4.4 4.4
V
OH
4.5 V V
I
OH
= –8 mA 3.94 3.8 3.8 3.7
I
OL
= 50 µA 0.1 0.1 0.1 0.1
V
OL
4.5 V V
I
OH
= 8 mA 0.36 0.44 0.44 0.44
0 to 5.5
I
I
OE or DIR V
I
= 5.5 V or GND ±0.1 ±1
(1)
±1 ±1 µA
V
I
OZ
A or B inputs
(2)
V
O
= V
CC
or GND 5.5 V ±.25 ±2.5 ±2.5 ±2.5 µA
V
I
= V
CC
or
I
CC
I
O
= 0 5.5 V 4 40 40 40 µA
GND,
One input at 3.4 V, Other
ΔI
CC
(3)
5.5 V 1.35 1.5 1.5 1.5 mA
inputs at VCC or GND
C
i
OE or DIR V
I
= V
CC
or GND 5 V 2.5 10 10 pF
C
io
A or B inputs V
I
= V
CC
or GND 5 V 4 pF
(1) On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.
(2) For I/O ports, the parameter I
OZ
includes the input leakage current.
(3) This is the increase in supply current for each input at one of the specified TTL voltage levels, rather than 0 V or V
CC
.
SWITCHING CHARACTERISTICS
over recommended operating free-air temperature range, V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
Recommended
SN54AHCT245 SN74AHCT245
T
A
= 25°C SN74AHCT245
FROM TO LOAD
–55°C TO 125°C –40°C TO 85°C
PARAMETER UNIT
–40°C TO 125°C
(INPUT) (OUTPUT) CAPACITANCE
TYP MAX MIN MAX MIN MAX MIN MAX
t
PLH
4.5
(1)
7.7
(1)
1
(1)
10
(1)
1 8.5 1 10
A or B B or A C
L
= 15 pF ns
t
PHL
4.5
(1)
7.7
(1)
1
(1)
10
(1)
1 8.5 1 10
t
PZH
8.9
(1)
13.8
(1)
1
(1)
16
(1)
1 15 1 16
OE A or B C
L
= 15 pF ns
t
PZL
8.9
(1)
13.8
(1)
1
(1)
16
(1)
1 15 1 16
t
PHZ
9.2
(1)
14.4
(1)
1
(1)
16.5
(1)
1 15.5 1 16.5
OE A or B C
L
= 15 pF ns
t
PLZ
9.2
(1)
14.4
(1)
1
(1)
16.5
(1)
1 15.5 1 16.5
t
PLH
5.3 8.7 1 11 1 9.5 1 11
A or B B or A C
L
= 50 pF ns
t
PHL
5.3 8.7 1 11 1 9.5 1 11
t
PZH
9.7 14.8 1 17 1 16 1 17
OE A or B C
L
= 50 pF ns
t
PZL
9.7 14.8 1 17 1 16 1 17
(1) On products compliant to MIL-PRF-38535, this parameter is not production tested.
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