参数资料
| 型号： | XR3177EID-F |
| 厂商： | Exar Corporation |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 DIFF 3V 8NSOIC |
| 产品变化通告： | Interface Product Discontinuation 21/Mar/2012 |
| 特色产品： | XR317xE 3.3 V RS-485 High Differential Output Transceivers |
| 标准包装： | 98 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422/RS485 |
| 电源电压： | 3.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 其它名称： | 1016-1317-5 |
XR3170E-3178E
17
REV. 1.0.0
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not
specifically refer to integrated circuits. The XR3170E family helps you design equipment to meet
IEC 61000-4-2, without sacrificing board-space and cost for external ESD-protection components.
The major differences between tests done using the Human body model and IEC 61000-4-2 is a higher peak
current in IEC 61000-4-2. Series resistance is lower in the IEC 61000-4-2 model. Hence, the ESD withstand
voltage measured to IEC 61000-4-2 is generally lower than that of human body model.
The air-gap test involves approaching the device with a charged probe. The contact discharge method
connects the probe to the device before the probe is energized.
MACHINE MODEL
The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The
objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and
assembly.
256 TRANSCEIVERS ON THE BUS
The standard RS-485 receiver input impedance is 12k Ohms (1 unit load). A standard driver can drive up to 32
unit loads. The XR3170E family of transceivers have only a 1/8th unit load receiver input impedance of 96k
Ohms, thereby allowing eight times as many, up to 256, transceivers to be connected in parallel on a
communication line. Any combination of these devices and other RS-485 transceivers up to a total of 32 unit
loads may be connected to the line.
LOW POWER SHUTDOWN MODE
Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously. While in shutdown
devices draw less than 1
A of supply current. DE and RE may be tied together and driven by a single control
signal. Devices are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the
inputs are in this state for at least 600ns, the parts will enter shutdown.
Enable times tZH and tZL apply when the part is not in low-power shutdown state. Enable times tZH(SHDN) and
tZL(SHDN) apply when the parts are shutdown. The drivers and receivers take longer to become enabled from
low-power shutdown tZH(SHDN) and tZL(SHDN) than from driver / receiver disable mode (tZH and tZL).
DRIVER OUTPUT PROTECTION
Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus
contention. First, a driver current limit on the output stage provides immediate protection against short circuits
over the whole common-mode voltage range. Second, a thermal-shutdown circuit forces the driver outputs into
a high-impedance state if junction temperature becomes excessive.
LINE LENGTH
The RS-485/RS-422 standard covers line lengths up to 4000ft. Maximum achievable line length is a function of
signal attenuation and noise. Termination prevents signal reflections by eliminating the impedance mismatches
on a transmission line. Line termination is generaly used if rise and fall times are shorter than the round-trip
signal propagation time
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR3177EIDTR-F | 功能描述:RS-422/RS-485 接口 IC Full Duplex RS-422/ RS-485 Transceiver 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 |
| XR3178EID | 制造商:EXAR 制造商全称:EXAR 功能描述:3.3V High Speed RS-485/RS-422 TRANSCEIVERS WITH 1/8 UNIT LOAD |
| XR3178EID-F | 功能描述:RS-422/RS-485 接口 IC Half Duplex RS-422/ RS-485 Transceiver 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 |
| XR3178EIDTR-F | 功能描述:RS-422/RS-485 接口 IC Half Duplex RS-422/ RS-485 Transceiver 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 |
| XR-320 | 制造商:EXAR 制造商全称:EXAR 功能描述:Monolithic Timing Circuit |
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