參數(shù)資料
型號： MAX3480BCPI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： Complete, Isolated, 3.3V RS-485/RS-422 Data Interface
中文描述： LINE TRANSCEIVER, PDIP28
封裝： 0.600 INCH, PLASTIC, MO-015AL, DIP-28
文件頁數(shù)： 10/16頁
文件大?。?/td> 158K
代理商： MAX3480BCPI
M
Complete, Isolated, 3.3V
RS -485/RS -422 Data Interfac e
10
______________________________________________________________________________________
shutdown circuitry that puts the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high output if the input
is open circuit.
The driver outputs are enabled by bringing DE
′
high.
Driver-enable times are typically 200ns for the
MAX3480A and 50μs for the MAX3480B. Allow time for
the devices to be enabled before sending data. When
enabled, driver outputs function as line drivers. Driver
outputs are high impedance when DE
′
is low. While
outputs are high impedance, they function as line
receivers.
The MAX3480A/MAX3480B typically withstand
1600V
RMS
(1 minute) or 2000V
RMS
(1 second). The iso-
lated outputs of these devices meet all RS-485/RS-422
specifications. The logic inputs can be driven from any
TTL/CMOS-logic family with a series resistor, and the
received data output can directly drive any of the
TTL/CMOS-logic families with only a resistive pull-up.
Boost V oltage
The MAX3480 requires external diodes on the primary
of the transformer to develop the boost voltage for the
power oscillator. In normal operation, whenever one of
the oscillator outputs (D1 and D2) goes low, the other
Figure 2. Typical Application Circuit
AC1 (MAKE NOCONNECTION)
AC2 (MAKE NOCONNECTION)
ISOV
CC1
B
SHIELD (OPTIONAL)
EXTERNAL RS-485/RS-422 WIRING
D2
D1
D1, D2
1N914
V
CC2
V
CC1
ISORODRV
A
B
A
SH
ISODI IN
ISODE IN
V
CC3
SD
FS
GND1
ISOCOM1
ISODI DRV
ISOV
CC2
ISODE DRV
GND2
DE
V
CC4
DI
ISOCOM2
ISOROLED
V
CC5
RO
R
L
R
L
R4
R5
R1
R2
16
14
12
5
7
13
15
18
3
8
2
DI
DE
RO
17
20
9
10
11
RECEIVER OUTPUT
6
4
R8
100
C3
0.01μF
R6
200
R7
R3
BOOSTED V+
74HC240
DRIVER INPUT
DRIVER ENABLE
V
IN
3.0V TO3.6V
22μF
6V
0.1μF
C1
C2
MAX3480A/B
LOGIC GROUND
ISOLATION BARRIER
ISOLATION COMMON
MAX485
MAX487
MAX845
1
2
28
27
3
4
5
6
7
8
9
10
11
12
13
14
26
25
24
23
22
21
20
19
18
17
16
15
SHIELD (OPTIONAL)
NOTE: RESISTOR R8 PROTECTS
THE MAX3480 FROM TRANSIENT
CURRENTS BETWEEN SHIELD AND
“A” & “B”.
TWISTED PAIR
TOOTHER TRANSCEIVERS
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
TWISTED PAIR
TOOTHER TRANSCEIVERS
Table 1. Pull-Up and LED Drive Resistors
PART
R1 (
)
R2 (
)
R3 (
)
R4 (
)
R5 (
)
R6 (
)
MAX3480A
150
130
680
3000
1000
200
MAX3480B
130
330
2000
2200
3000
200
R7 (
)
Open
470
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3480BCPI+ 功能描述:RS-422/RS-485 接口 IC 3.3V 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX3480BEPI 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX3480BEPI+ 功能描述:RS-422/RS-485 接口 IC 3.3V 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX3480EACPI 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
MAX3480EACPI+ 功能描述:RS-422/RS-485 接口 IC 3.3V 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube
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