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| 型号： | SP3490EN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 FULL DUPLEX 8NSOIC |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | 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： | 带卷 (TR) |
| 其它名称： | SP3490EN-L/TR-ND |
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3490_349_02_0270
The
SP3490 and SP3491 are two members
in the family of +3.3V low power full-du-
plex transceivers that meet the electrical
specifications of the RS-485 and RS-422
serial protocols. These devices are pin-to-
pin compatible with the
Exar SP490 and
SP49 devices as well as popular industry
standards.The
SP3490andSP3491feature
Exar'sBiCMOSprocessallowinglowpower
operation without sacrificing performance.
The RS-485 standard is ideal for multi-drop
applicationsandforlong-distanceinterfaces.
RS-485allowsupto32driversand32receiv-
ers to be connected to a data bus, making it
an ideal choice for multi-drop applications.
Since the cabling can be as long as 4,000
feet, RS-485 transceivers are equipped with
a wide (-7V to +2V) common mode range
to accommodate ground potential differ-
ences. Because RS-485 is a differential
interface, data is virtually immune to noise
in the transmission line.
Drivers
Thedriversforboththe
SP3490andSP3491
have differential outputs. The typical voltage
outputswingwithnoloadwillbe0voltstoVcc.
With worst case loading of 54 across the
differential outputs, the drivers can maintain
greater than .5V voltage levels.
The driver of the
SP3491 has a driver en-
able control line which is active HIGH. A
logic HIGH on DE (pin 4) of the
SP3491
will enable the differential driver outputs. A
logic LOW on the DE(pin 4) will tri-state the
driver outputs. The
SP3490 does not have
a driver enable.
Receivers
The receivers of the
SP3490 and SP3491
have differential inputs with an input sensi-
tivity of ±200mV. Input impedance of the
receivers is typically 15k (12k minimum).
A wide common mode range of -7V to +2V
allows for large ground potential differences
betweensystems. The receiversforboththe
SP3490 and SP3491 are equipped with a
fail-safe feature that guarantees the receiver
output will be in a HIGH state when the input
is left unconnected.
The receiver of the
SP3491 has a enable
control line which is active LOW. A logic
LOW on REB (pin 3) of the
SP3491 will en-
able the differential receiver. A logic HIGH
on REB (pin 3) of the
SP3491 will tri-state
the receiver.
DESCRIPTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3490EP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3490EP-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3491 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate |
| SP3491CN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate |
| SP3491CN-L | 功能描述:RS-485接口IC RS485 10000 kbp 3.3V temp 0C to 70C RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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