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參數(shù)資料
| 型號(hào)： | LMS1485M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V Low Power RS-485 Differential Bus Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 224K |
| 代理商： | LMS1485M |
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 1)
Supply Voltage, V
CC
(Note 2)
Input Voltage, V
IN
(DI, DE, or RE)
Voltage Range at Any Bus Terminal
(AB)
Receiver Outputs
Package Thermal Impedance,
θ
JA
SOIC (Note 3)
Junction Temperature (Note 3)
Operating Free-Air Temperature
Range, T
A
Commercial
Industrial
Storage Temperature Range
ESD Rating (Note 4) (Note 8)
7V
0.3V to V
CC
+ 0.3V
7V to 12V
0.3V to V
CC
+ 0.3V
125C/W
150C
0C to 70C
40C to 85C
65C to 150C
8kV
ESD Rating (Note 4) (Note 9)
Soldering Information
Infrared or Convection (20 sec.)
2kV
235C
Operating Ratings
Min Nom Max
4.75
5.0
7
Supply Voltage, V
CC
Voltage at any Bus Terminal
(Separately or Common Mode)
V
IN
or V
IC
High-Level Input Voltage, V
IH
(Note 5)
Low-Level Input Voltage, V
IL
(Note 5)
Differential Input Voltage, V
ID
(Note 6)
5.25
12
V
V
2
V
0.8
V
±
12
V
Electrical Characteristics
Over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
Symbol
Driver Section
V
OD
V
OD1
V
OD2
V
OD3
V
OD
Parameter
Conditions
Min
Typ
Max
Units
Differential Output Voltage
Differential Output Voltage
Differential Output Voltage
Differential Output Voltage
Change in Magnitude of
Differential Output Voltage
Common-Mode Output
Voltage
Change in Magnitude of
Common-Mode Output
Voltage
Short-Circuit Output Current
R =
∞
(
Figure 1
)
R = 50
(
Figure 1
), RS-422
R = 27
(
Figure 1
), RS-485
V
TEST
= 7V to + 12V (
Figure 2
)
R = 27
or 50
(
Figure 1
), (Note 7)
5
5
5
5
V
V
V
V
V
2
1.5
1.5
0.2
0.2
V
OC
R = 27
or 50
(
Figure 1
), (Note 7)
3
V
V
OC
R = 27
or 50
(
Figure 1
), (Note 7)
0.2
0.2
V
I
OSD
V
O
= High, 7V
≤
V
CM
≤
+12V
V
O
= Low, 7V
≤
V
CM
≤
+12V
DE, DI, RE
250
250
250
250
0.8
mA
V
INL
CMOS Input Logic Threshold
Low
CMOS Input Logic Threshold
High
Logic Input Current
Receiver Section
V
TH
Differential Input Threshold
Voltage
V
TH
Input Hysteresis Voltage
(V
TH+
V
TH
)
R
IN
Input Resistance
I
IN
Input Current (A, B)
V
V
INH
DE, DI, RE
2
V
I
IN
DE, DI
1
1
μA
7V
≤
V
CM
≤
+ 12V
0.2
+0.2
V
V
CM
= 0
70
mV
7V
≤
V
CM
≤
+ 12V
V
IN
= 12V
V
IN
= 7V
RE
I
OL
= 4mA
12
k
1
mA
0.8
1
I
RE
V
OL
Logic Enable Input Current
CMOS Low-Level Output
Voltage
1
μA
V
0.4
L
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