Datasheet
SN54HCT245, SN74HCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS020E – MARCH 1984 – REVISED AUGUST 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HCT245 SN74HCT245
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 V
CC
= 4.5 V to 5.5 V 2 2 V
V
IL
Low-level input voltage V
CC
= 4.5 V to 5.5 V 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
∆t/∆v Input transition rise/fall time 500 500 ns
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 SN54HCT245 SN74HCT245
UNIT
PARAMETER
TEST CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
V
OH
V
I
= V
IH
or V
IL
I
OH
= –20 µA
4.5 V
4.4 4.499 4.4 4.4
V
V
OH
V
I
= V
IH
or V
IL
I
OH
= –6 mA
4.5 V
3.98 4.3 3.7 3.84
V
V
OL
V
I
= V
IH
or V
IL
I
OL
= 20 µA
4.5 V
0.001 0.1 0.1 0.1
V
V
OL
V
I
= V
IH
or V
IL
I
OL
= 6 mA
4.5 V
0.17 0.26 0.4 0.33
V
I
I
DIR or OE V
I
= V
CC
or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
I
OZ
A or B V
O
= V
CC
or 0 5.5 V ±0.01 ±0.5 ±10 ±5 µA
I
CC
V
I
= V
CC
or 0, I
O
= 0 5.5 V 8 160 80 µA
∆I
CC
†
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
CC
5.5 V 1.4 2.4 3 2.9 mA
C
i
‡
DIR or OE
4.5 V
to 5.5 V
3 10 10 10 pF
†
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
.
‡
Parameter C
i
does not apply to transceiver I/O ports.
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
V
CC
T
A
= 25°C SN54HCT245 SN74HCT245
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
pd
A or B
B or A
4.5 V 16 22 33 28
ns
t
pd
A or B
B or A
5.5 V 14 20 30 25
ns
t
en
OE
A or B
4.5 V 25 46 69 58
ns
t
en
OE
A or B
5.5 V 22 41 62 52
ns
t
dis
OE
A or B
4.5 V 26 40 60 50
ns
t
dis
OE
A or B
5.5 V 23 36 54 45
ns
t
t
A or B
4.5 V 9 12 18 15
ns
t
t
A or B
5.5 V 8 11 16 14
ns