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參數(shù)資料
| 型號： | 74AS245 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 中文描述： | 八路總線收發(fā)器與三態(tài)輸出 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 515K |
| 代理商： | 74AS245 |
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272A
–
NOVEMBER 1994
–
REVISED JANUARY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 2)
SN54ALS245A
MIN
NOM
SN74ALS245A
MIN
NOM
UNIT
MAX
MAX
VCC
VIH
VIL
IOH
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
High-level input voltage
2
2
V
Low-level input voltage
0.7
0.8
V
High-level output current
–
12
–
15
mA
IOL
Low level output current
Low-level output current
12
24
48
mA
TA
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
NOTE 2: 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.
Operating free-air temperature
–
55
125
0
70
°
C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS245A
MIN
TYP
SN74ALS245A
MIN
TYP
UNIT
MAX
MAX
VIK
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II =
–
18 mA
IOH =
–
0.4 mA
IOH =
–
3 mA
IOH =
–
12 mA
IOH =
–
15 mA
IOL= 12 mA
IOL = 24 mA
IOL = 48 mA
VI = 7 V
VI = 5.5 V
–
1.5
–
1.5
V
VCC
–
2
2.4
VCC
–
2
2.4
VOH
3.2
3.2
V
VCC = 4.5 V
2
2
0.25
0.4
0.25
0.4
VOL
VCC = 4.5 V
0.35
0.5
V
0.35
0.5
II
Control inputs
VCC= 5 5 V
VCC = 5.5 V
0.1
0.1
mA
A or B ports
0.1
0.1
IIH
Control inputs
A or B ports
§
VCC= 5 5 V
VCC = 5.5 V,
VI= 2 7 V
VI = 2.7 V
20
20
μ
A
20
20
IIL
Control inputs
A or B ports
§
VCC= 5 5 V
VCC = 5.5 V,
VI= 0 4 V
VI = 0.4 V
–
0.1
–
0.1
mA
–
0.1
–
0.1
IO
VCC = 5.5 V,
VO = 2.25 V
Outputs high
–
20
–
112
–
30
–
112
mA
30
48
30
45
ICC
VCC = 5.5 V
Outputs low
36
60
36
55
mA
Outputs disabled
38
63
38
58
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
All typical values are VCC = 5 V, TA = 25
°
C.
§
For I/O ports, the parameters IIH and IIL include the off-state output current.
The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, IOS.
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