參數(shù)資料
型號(hào)： SN74HCT244DBLE
廠商： TEXAS INSTRUMENTS INC
元件分類： 總線收發(fā)器
英文描述： HCT SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20
封裝： PLASTIC, SSOP-20
文件頁(yè)數(shù)： 13/19頁(yè)
文件大小： 752K
代理商： SN74HCT244DBLE
SN54HCT244, SN74HCT244
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SCLS175D – MARCH 1984 – REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HCT244
SN74HCT244
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
VCC = 4.5 V to 5.5 V
2
V
VIL
Low-level input voltage
VCC = 4.5 V to 5.5 V
0.8
V
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
t/v
Input transition rise/fall time
500
ns
TA
Operating free-air temperature
–55
125
–40
85
°C
NOTE 3: All unused inputs of the device must be held at VCC 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
VCC
TA = 25°C
SN54HCT244
SN74HCT244
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
VOH
VI = VIH or VIL
IOH = –20 A
4.5 V
4.4
4.499
4.4
V
VOH
VI = VIH or VIL
IOH = –6 mA
4.5 V
3.98
4.3
3.7
3.84
V
VOL
VI = VIH or VIL
IOL = 20 A
4.5 V
0.001
0.1
V
VOL
VI = VIH or VIL
IOL = 6 mA
4.5 V
0.17
0.26
0.4
0.33
V
II
VI = VCC or 0
5.5 V
±0.1
±100
±1000
nA
IOZ
VO = VCC or 0,
VI = VIH or VIL
5.5 V
±0.01
±0.5
±10
±5
A
ICC
VI = VCC or 0,
IO = 0
5.5 V
8
160
80
A
ICC
One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC
5.5 V
1.4
2.4
3
2.9
mA
Ci
4.5 V
to 5.5 V
3
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 VCC.
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25°C
SN54HCT244
SN74HCT244
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tpd
A
Y
4.5 V
15
28
42
35
ns
tpd
A
Y
5.5 V
13
25
38
32
ns
ten
OE
Y
4.5 V
21
35
53
44
ns
ten
OE
Y
5.5 V
19
32
48
40
ns
tdis
OE
Y
4.5 V
19
35
53
44
ns
tdis
OE
Y
5.5 V
18
32
48
40
ns
tt
Y
4.5 V
8
12
18
15
ns
tt
Y
5.5 V
7
11
16
14
ns
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