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| 型号： | SP491EEN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 FULL DUPLX 14NSOIC |
| 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： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC（窄型） |
| 包装： | 带卷 (TR) |
| 其它名称： | SP491EEN-L/TR-ND |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP490E,49E_0_05243
DESCRIPTION
T h e
S P 4 9 0 E a n d S P 4 9 1 E a r e
full-duplex differential transceiv-
ers that meet the requirements of
RS-485 and RS-422. Fabricated with a
Exar
proprietary BiCMOS process, both products
require a fraction of the power of older bi-
polar designs.
The RS-485 standard is ideal for multi-drop
applications or for long-distance interfaces.
RS-485 allows up to 32 drivers and 32
receivers 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) com-
mon mode range to accommodate ground
potential differences. Because RS-485
is a differential interface, data is virtually
immune to noise in the transmission line.
Driver...
Thedriversforboththe
SP490EandSP491E
have differential outputs. The typical voltage
output swing with no load will be 0 volts to
+5 volts. With worst case loading of 54
across the differential outputs, the driver can
maintain greater than .5V voltage levels.
The driver of the
SP491Ehasadriverenable
control line which is active high. A logic high
on DE (pin 4) of the
SP491E will enable
the differential driver outputs. A logic low
on DE (pin 4) of the
SP491E will tri-state the
driver outputs. The
SP490E does not have
a driver enable.
Receiver...
The receivers for both the
SP490E and
SP491E have differential inputs with an
input sensitivity as low as ±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 be-
tween systems. The receivers for both the
SP490E and SP491E are equipped with the
fail-safe feature. Fail-safe guarantees that
the receiver output will be in a high state
when the input is left unconnected.
The receiver of the
SP491E has a receiver
enable control line which is active low.Alogic
low on REB (pin 3) of the
SP491E will enable
the differential receiver. A logic high on REB
(pin 3) of the
SP491E will tri-state the re-
ceiver.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP491EEN-TR | 制造商:Exar Corporation 功能描述: 制造商:SIPEX 功能描述: |
| SP491EEP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Enhanced Full Duplex RS-485 Transceivers |
| SP491EEP-L | 功能描述:RS-485接口IC RS485 10000 kbps temp -40C to 85C 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 |
| SP491EN | 制造商:Exar Corporation 功能描述: |
| SP491EN/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
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