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参数资料
| 型号： | ISL43485 |
| 厂商： | Intersil Corporation |
| 元件分类： | RS-485 |
| 英文描述： | 3.3V, Low Power, 30Mbps, RS-485/RS-422 |
| 中文描述： | 3.3，低功耗，30Mbps的，RS-485/RS-422收发 |
| 文件页数： | 7/11页 |
| 文件大小： | 477K |
| 代理商： | ISL43485 |
7
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a point-
to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices)
receivers on each bus. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any
combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 spec requires that
drivers must handle bus contention without sustaining any
damage.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as
long as 4000’, so the wide CMR is necessary to handle
ground potential differences, as well as voltages induced in
the cable by external fields.
Receiver Features
This device utilizes a differential input receiver for maximum
noise immunity and common mode rejection. Input
sensitivity is ±200mV, as required by the RS422 and RS-485
specifications.
Receiver input impedance surpasses the RS-422 spec of
4k
, and meets the RS-485 “Unit Load” requirement of 12k
minimum.
Receiver inputs function with common mode voltages as
great as +9V/-7V outside the power supplies (i.e., +12V and
-7V), making them ideal for long networks where induced
voltages are a realistic concern.
All the receivers include a “fail-safe if open” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating).
The receiver easily meets the data rate supported by the
driver, and the receiver output is tri-statable via the active
low RE input.
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. RECEIVER DATA RATE AND PROPAGATION DELAY
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES
Test Circuits and Waveforms
(Continued)
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
+1.5V
15pF
RO
3V
0V
t
PLH
1.5V
1.5V
V
CC
0V
50%
50%
t
PHL
A
1k
V
CC
GND
SW
PARAMETER
DE
A
SW
t
HZ
0
+1.5V
GND
t
LZ
0
-1.5V
V
CC
t
ZH
(Note 6)
0
+1.5V
GND
t
ZL
(Note 6)
0
-1.5V
V
CC
t
ZH(SHDN)
(Note 9)
0
+1.5V
GND
t
ZL(SHDN)
(Note 9)
0
-1.5V
V
CC
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
3V
0V
1.5V
1.5V
V
OH
0V
1.5V
V
OH
- 0.25V
t
HZ
RO
V
CC
V
OL
1.5V
V
OL
+ 0.25V
t
LZ
RE
OUTPUT HIGH
OUTPUT LOW
t
ZL
, t
ZL(SHDN)
NOTE 7
t
ZH
, t
ZH(SHDN)
NOTE 7
NOTE 7
ISL43485
相关PDF资料 |
PDF描述 |
|---|---|
| ISL43485IB | 3.3V, Low Power, 30Mbps, RS-485/RS-422 |
| ISL43485IB-T | 3.3V, Low Power, 30Mbps, RS-485/RS-422 |
| ISL43681 | Low-Voltage, Single and Dual Supply, 8 to 1 Multiplexer and Differential 4 to 1 Multiplexer |
| ISL43741IR | Low-Voltage, Single and Dual Supply, 8 to 1 Multiplexer and Differential 4 to 1 Multiplexer |
| ISL43681IR | Low-Voltage, Single and Dual Supply, 8 to 1 Multiplexer and Differential 4 to 1 Multiplexer |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL43485_05 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3.3V, Low Power, 30Mbps, RS-485/RS-422 Transceiver |
| ISL43485IB | 功能描述:IC TXRX 1TX/1RX 3V RS-485 8-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
| ISL43485IB-T | 功能描述:IC TXRX 1TX/1RX 3V RS-485 8-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
| ISL43485IBZ | 功能描述:RS-422/RS-485 接口 IC HI SPD 8LD -40+85 3V RS-485 TRANS 1T RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| ISL43485IBZ | 制造商:Intersil Corporation 功能描述:IC TRANSCEIVER HALF DUP |
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