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)： 12/20頁(yè)
文件大小： 315K
代理商： MAX1480B
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
12
______________________________________________________________________________________
Under these conditions, the MAX1480B/MAX1490B supply
current is reduced to as low as 0.2μA.
The high-speed optocouplers on the MAX1480A/
MAX1490A consume an additional 10mA through V
CC5
(V
CC4
for the MAX1490A). Therefore, to completely shut
down these devices, use an external P-channel MOSFET as
shown in Figure 3. In normal operation, SD is low, turning
the MOSFET on and thereby providing power to all the
V
CC_
pins. When SD is pulled high, the power oscillator is
disabled and the switch is turned off, disconnecting power
from the DI and DE optocouplers. In normal operating
mode, the switch carries only the optocoupler currents, so
an on-resistance of several ohms will not significantly
degrade efficiency.
SHIELD (OPTIONAL)
EXTERNAL RS-485/RS-422 WIRING
A
R
L
R
L
B
Z
Y
R
L
R
L
R3
R4
R5, 100
SH1
SH2
R1
R2
R6, 100
DI
′
V
IN
5V
22uF
0.1uF
C1
C2
MAX1490A/B
LOGIC GROUND
ISOLATION BARRIER
ISOLATED COMMON
DRIVER INPUT
RECEIVER OUTPUT
DI
RO
74HC86
OR EQUIVALENT
MAX845
N
MAX1490A: MAX490
MAX1490B MAX488
ISODI DRV
ISORODRV
A
B
Z
Y
D
R
N
Q
Q
T F/F
V
CC3
FS
1.0OSC
1.45MHz
SD
GND1
D2
D1
SHIELD (OPTIONAL)
NOTE: RESISTORS R5 AND R6 PROTECT
THE MAX1490 FROM TRANSIENT
CURRENTS BETWEEN SHIELD AND
TRANSMISSION LINES.
TWISTED PAIR
TOOTHER TRANSCEIVERS
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
TWISTED PAIR
TOOTHER TRANSCEIVERS
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
AC1 (MAKE NOCONNECTION)
AC2 (MAKE NOCONNECTION)
ISOV
CC1
ISORODRV
D2
D1
V
CC2
V
CC1
A
B
Z
Y
V
CC3
SD
FS
GND1
16
15
14
13
9
10
11
12
ISOCOM1
ISODI DRV
ISOV
CC2
ISOROLED
GND2
R0
V
CC4
DI
M
M
M
Figure 2. MAX1490A/MAX1490B Detailed Block Diagram and Typical Application Circuit
Table 2. Pull-Up and LED Drive Resistors
1000
3000
R2 (
)
1000
3000
R4 (
)
330
330
R3 (
)
200
200
MAX1490A
MAX1490B
R1 (
)
PART
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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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