參數(shù)資料
型號(hào)： MAX1480B
廠商： Maxim Integrated Products, Inc.
英文描述： Complete, Isolated RS-485/RS-422 Data Interface(半雙工，完全隔離的RS-485/422收發(fā)器)
中文描述： 完備的隔離型、RS-485/RS-422數(shù)據(jù)接口
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 315K
代理商： MAX1480B
and components from one side should not be locat-
ed near those of the other side.
A shield trace connected to the ground on each side
of the barrier can help intercept capacitive currents
that might otherwise couple into the signal path. In a
double-sided or multilayer board, these shield traces
should be present on all conductor layers.
Try to maximize the width of the isolation barrier
wherever possible; a clear space of at least 0.25
inches between ground and isolated common is
suggested.
Pull-Up and LED Drive Resistors
The MAX1480A/MAX1480B/MAX1490A/MAX1490B are
specified and characterized using the resistor values
shown in Table 1 of Figure 1 and Table 2 of Figure 2.
Altering the recommended values can degrade perfor-
mance.
The DI and DE (MAX1480A/B only) inputs are the cath-
odes of LEDs whose anodes are connected to the
supply. These points are best driven by a CMOS-logic
gate with a series resistor to limit the current. The resis-
tor values shown in Tables 1 and 2 are recommended
when the 74HC86 gate or equivalent is used. These
values may need to be adjusted if a driving gate with
dissimilar series resistance is used.
All pull-up resistors are based on optocoupler specifica-
tions in order to optimize the devices’ data-transfer rates.
Isolated Common Connec tion
The isolated common may be completely floating with
respect to the logic ground and the effective network
ground. The receiver input resistors will cause the iso-
lated common voltage to go to the mean voltage of the
receiver inputs. If using shielded cable, tie the isolated
common to the shield through a 100
resistor. In the
case of the MAX1490, each shield should have its own
100
resistor (Figures 1, 2, 13, and 14).
2 8
3k
3k
3k
5 7 12
5 7 12
11
23
13
1
3k
2
4
3
13
3k
74HC04
200
9
25
25
23
26
A
B
A
B
19
22
17
21
9
200
510
DRIVER
ENABLE
B > A
510
74HC123
CLR
4
A
Q
3
11
1
DRIVER
ENABLE
A > B
11
200
15
24
24
1014
NETWORK SEGMENT A
NETWORK SEGMENT B
2 81014
CLR
74HC123
12
A
Q
9
3k
26
19
22
17
21
200
15
1000pF
51k
+5
+5V
+5V
+5
51k
16
15
14
13
2 B
Q
1000pF
7
6
5
10 B
Q
MAX1480B
MAX1480B
Figure 15. Doubly Isolated RS-485 Repeater
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
18
______________________________________________________________________________________
相關(guān)PDF資料
PDF描述
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參數(shù)描述
MAX1480BCPI 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX1480BCPI+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 Data Interface RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX1480BEPI 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX1480BEPI+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-422/485 Data Interface RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX1480CCPI 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
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