參數資料
| 型號： | XR3178EID-F |
| 廠商： | Exar Corporation |
| 文件頁數： | 1/24頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 DIFF 3V 8NSOIC |
| 產品變化通告： | Interface Product Discontinuation 21/Mar/2012 |
| 特色產品： | XR317xE 3.3 V RS-485 High Differential Output Transceivers |
| 標準包裝： | 98 |
| 類型： | 收發器 |
| 驅動器/接收器數： | 1/1 |
| 規程： | RS422/RS485 |
| 電源電壓： | 3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOICN |
| 包裝： | 管件 |
| 其它名稱： | 1016-1318-5 |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
DECEMBER 2009
REV. 1.0.0
GENERAL DESCRIPTION
The XR3170E - XR3178E family of RS-485 devices
are designed for reliable, bidirectional communication
on multipoint bus transmission lines. Each device
contains one differential driver and one differential
receiver. XR3172E, XR3175E and XR3178E are half-
duplex devices; other part numbers are full-duplex.
All devices comply with TIA/EIA-485 and TIA/EIA-422
standards. Lead free and RoHS compliant packages
are available for all models.
These devices are ruggedized for use in harsh
operating conditions over the entire common-mode
voltage range from -7V to +12V. Receivers are
specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-
485 bus pins are protected against severe ESD
events up to +/-15kV (Air-Gap and Human Body
Model) and up to +/-8kV Contact Discharge (IEC
61000-4-2). Drivers are protected from excess
current flow caused by bus contention or output
short-circuits by both an internal current limit and a
thermal-overload shutdown. Devices are rated for
Industrial (-40 to +85°C) operating temperatures.
Receivers have exceptionally high input impedance,
which places only 1/8th the standard load on a shared
bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 3.3V power supply
and draw negligible quiescent power. All versions
except the XR3171E, XR3174E and XR3177E may
independently enable and disable their driver and
receiver and enter a low power shutdown mode if
both driver and receiver are disabled. All outputs
maintain high impedance in shutdown or when
powered off.
FEATURES
3.3V Single Supply Operation
High Speed 20Mbps Data Rate
Slew Rate Limited - 250kbps And 500kbps Data
Rate
1/8th Unit Load, 256 Transceivers On Bus
Enhanced Failsafe For Receiver - Open, Short Or
Terminated Lines
Robust ESD Protection For RS-485 Pins
■ +/-15kV Air-Gap Discharge
■ +/-15kV Human Body Model
■ +/-8kV Contact Discharge
Hot Swap Glitch Protection
Driver Short Circuit Current Limit And Thermal
Shutdown For Overload Protection
Ultra-Low 650uA Quiescent Current
1A Shutdown Mode
Industry Standard Package Footprints
TYPICAL APPLICATIONS
Motor Control
Building Automation
Security Systems
Remote Utility Meter Reading
Long Or Un-Terminated Transmission Lines
FIGURE 1. TYPICAL APPLICATION CIRCUIT
RT
STUB
XR3178E
A
AA
A
B
BB
B
DI
RO
RE
DE
RE
DI
RO
RE
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