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参数资料
| 型号： | SN54HCT245FK |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 4.27V Voltage Detector with Active Low Open Collector Output for 5V Systems; Package: Micro8™; No of Pins: 8; Container: Tape and Reel; Qty per Container: 4000 |
| 中文描述： | 八路总线收发器与三态输出 |
| 文件页数： | 3/16页 |
| 文件大小： | 529K |
| 代理商： | SN54HCT245FK |
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
MIN
NOM
SN74HCT245
MIN
NOM
UNIT
MAX
MAX
VCC
VIH
VIL
VI
VO
t/
v
TA
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.
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
High-level input voltage
VCC = 4.5 V to 5.5 V
VCC = 4.5 V to 5.5 V
2
2
V
Low-level input voltage
0.8
0.8
V
Input voltage
0
VCC
VCC
500
0
VCC
VCC
500
V
Output voltage
0
0
V
Input transition rise/fall time
ns
°
C
Operating free-air temperature
–55
125
–40
85
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
°
C
TYP
4.499
SN54HCT245
MIN
4.4
SN74HCT245
MIN
4.4
UNIT
MIN
4.4
MAX
MAX
MAX
VOH
VI = VIH or VIL
IOH = –20
μ
A
IOH = –6 mA
IOL = 20
μ
A
IOL = 6 mA
4.5 V
V
3.98
4.3
3.7
3.84
VOL
VI = VIH or VIL
4.5 V
0.001
0.1
0.1
0.1
V
0.17
±
0.1
±
0.01
0.26
±
100
±
0.5
0.4
0.33
±
1000
II
IOZ
ICC
DIR or OE
VI = VCC or 0
VO = VCC or 0
VI = VCC or 0,
One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC
5.5 V
±
1000
±
10
160
nA
μ
A
μ
A
A or B
5.5 V
±
5
80
IO = 0
5.5 V
8
ICC
5.5 V
1.4
2.4
3
2.9
mA
Ci
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 VCC.
Parameter Ci 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
(INPUT)
TO
VCC
TA = 25
°
C
TYP
SN54HCT245
MIN
SN74HCT245
MIN
UNIT
(OUTPUT)
MIN
MAX
MAX
MAX
tpd
A or B
B or A
4.5 V
16
22
33
28
ns
5.5 V
14
20
30
25
ten
OE
A or B
4.5 V
25
46
69
58
ns
5.5 V
22
41
62
52
tdis
OE
A or B
4.5 V
26
40
60
50
ns
5.5 V
23
36
54
45
tt
A or B
4.5 V
5.5 V
9
8
12
11
18
16
15
14
ns
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