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| 型号： | SP481ECN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS484 HALF 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： | 5V |
| 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) |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP48E,485E_04_05243
The
SP481E and SP485E are half-duplex
differentialtransceiversthatmeettherequire-
ments of RS-485 and RS-422. Fabricated
with an
Exar proprietary BiCMOS process,
this product requires a fraction of the power
of older bipolar designs.
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 +12V) 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
The driver outputs of the
SP481E and
SP485E are differential outputs meeting the
RS-485 and RS-422 standards. 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
drivers can maintain greater than 1.5V volt-
age levels. The drivers of the
SP481E and
SP485E have an enable control line which
is active HIGH. A logic HIGH on DE (pin 3)
will enable the differential driver outputs. A
logic LOW on the DE(pin 3) will tri-state the
driver outputs.
Thetransmittersofthe
SP481EandSP485E
will operate up to at least 10Mbps.
Receivers
The
SP481E and SP485E receivers 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 +12V
allows for large ground potential differences
between systems. The receivers of the
SP481E and SP485E have a tri-state en-
able control pin. A logic LOW on RE (pin 2)
will enable the receiver, a logic HIGH on RE
(pin 2) will disable the receiver.
The receiver for the
SP481E and SP485E
will operate up to at least 10Mbps. The
receiver for each of the two devices is
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.
Shutdown Mode
SP481E
The
SP481E is equipped with a Shutdown
mode. TO enable the shutdown state, both
driver and receiver must be disabled simul-
taneously. A logic LOW on DE (pin 3) and a
LogicHIGHonRE(pin2)willputthe
SP481E
into Shutdown mode. In Shutdown, supply
current will drop to typically A.
DESCRIPTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP481ECP | 制造商:Exar Corporation 功能描述:Line Transceiver, 1-Driver, 1-Receiver, 8 Pin, Plastic, DIP |
| SP481ECP-L | 功能描述:RS-485接口IC Enhanced Low Power Half-Duplex RS-485 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 |
| SP481EEN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Enhanced Low Power Half-Duplex RS-485 Transceivers |
| SP481EEN-L | 功能描述:RS-485接口IC RS485 10000 kbps 5V 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 |
| SP481EEN-L/TR | 功能描述:RS-485接口IC Enhanced Low Power Half-Duplex RS-485 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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