SN54HCT244, SN74HCT244
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SCLS175D – MARCH 1984 – REVISED AUGUST 2003
recommended operating conditions (see Note 3)
SN54HCT244
MIN NOM MAX
SN74HCT244
MIN NOM MAX
UNIT
V
V
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
I
High-level input voltage
Low-level input voltage
Input voltage
V
V
= 4.5 V to 5.5 V
= 4.5 V to 5.5 V
CC
0.8
0.8
V
CC
0
0
V
V
0
0
V
V
V
CC
CC
Output voltage
V
O
CC
CC
∆t/∆v
Input transition rise/fall time
Operating free-air temperature
500
125
500
85
ns
°C
T
A
–55
–40
NOTE 3: All unused inputs of the device must be held at V
or GND to ensure proper device operation. Refer to the TI application report,
CC
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
= 25°C
SN54HCT244 SN74HCT244
A
PARAMETER
TEST CONDITIONS
V
UNIT
V
CC
MIN
TYP
MAX
MIN
4.4
MAX
MIN
4.4
MAX
I
I
I
I
= –20 µA
= –6 mA
= 20 µA
= 6 mA
4.4 4.499
OH
OH
OL
OL
V
V = V or V
IH
4.5 V
4.5 V
OH
OL
I
IL
IL
3.98
4.3
0.001
0.17
0.1
3.7
3.84
0.1
0.26
100
0.5
8
0.1
0.4
0.1
0.33
1000
5
V
V = V or V
V
I
IH
I
I
I
V = V
I
or 0
5.5 V
5.5 V
5.5 V
1000
10
nA
µA
µA
I
CC
V
O
= V
or 0,
V = V or V
0.01
OZ
CC
CC
or 0,
I
IH
IL
V = V
I
I
O
= 0
160
80
CC
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
†
5.5 V
1.4
3
2.4
10
3
2.9
10
mA
pF
∆I
CC
CC
4.5 V
to 5.5 V
C
10
i
†
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
switching characteristics over recommended operating free-air temperature range, C = 50 pF
L
(unless otherwise noted) (see Figure 1)
T
A
= 25°C
TYP
15
SN54HCT244 SN74HCT244
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
ns
CC
MIN
MAX
28
MIN
MAX
42
MIN
MAX
35
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
t
t
t
t
A
Y
Y
Y
Y
pd
en
dis
t
13
25
38
32
21
35
53
44
ns
OE
OE
19
32
48
40
19
35
53
44
ns
18
32
48
40
8
12
18
15
ns
7
11
16
14
3
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