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| 型号： | MAX1490AEPG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC RS485/RS422 DATA INTRFC 24DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 16 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 24-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1403 (CN2011-ZH PDF) |
MAX1480A/B/C,
MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
20
______________________________________________________________________________________
Doubly Isolated RS-485 Repeater
The RS-422/RS-485 standard is specified for cable
lengths up to 4000 feet. When approaching or exceed-
ing the specified maximum cable length, a ground-
potential difference of several tens of volts can easily
develop. This difference can be either DC, AC, at
power-line frequency, or any imaginable noise or
impulse waveform. It is typically very low impedance so
that if a connection between the two grounds is
attempted, very large currents may flow. These cur-
rents are by their nature unstable and unpredictable. In
addition, they may cause noise to be injected into sen-
sitive instrumentation and, in severe cases, might actu-
ally cause physical damage to such equipment.
Figure 15 shows a half-duplex (two-wire), bidirectional,
party-line repeater system that prevents interference
and/or damage from ground-potential differences. Two
MAX1480A/MAX1480B/MAX1480C isolated RS-485
transceivers are used to isolate each of the network
segments from the electrical environment of the
repeater. The MAX1480A/MAX1480B/MAX1480C also
regenerate bus signals that may have been degraded
by line attenuation or dispersion.
In the idle state, both transmitters are disabled, while all
receivers in the system are enabled. If any device on
the system has information for any other device, it starts
sending its data onto the bus. Each data transmission
on the bus retriggers the one-shot, keeping the sending
transmitter enabled until there are no more transmis-
sions. All receivers receive all data; if this is undesir-
able, the protocol must allow for an address field so
receivers can ignore data not directed to them.
Each node must refrain from transmitting when data
already exists on the bus, and must resend data that is
corrupted by the collisions that inevitably occur with a
party-line system. With the repeater of Figure 15, there
might be transmitters up to 8000 feet apart. That repre-
sents more than 8s (assuming 1ns/foot of delay) in
which two nodes could be transmitting simultaneously.
The circuit in Figure 15 can be used either directly as
shown, with the slew-rate-limited MAX1480B/MAX1480C,
for data transfer rates up to 250kbps, or with the
MAX1480A for data rates up to 2.5Mbps (see Table 1
for pullup and LED resistor values when using the
MAX1480A, MAX1480B, or MAX1480C). If dual-port iso-
lation is not needed, one of the MAX1480C devices can
be replaced by a MAX487 for 250kbps applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1490AEPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface 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 |
| MAX1490BCPG | 功能描述:RS-422/RS-485 接口 IC 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 |
| MAX1490BCPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface 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 |
| MAX1490BEPG | 功能描述:RS-422/RS-485 接口 IC 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 |
| MAX1490BEPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface 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 |
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