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參數(shù)資料
| 型號： | SP491ECP-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485 FULL DUPLEX 14PDIP |
| 標準包裝： | 25 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 5V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 14-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 14-PDIP |
| 包裝： | 管件 |
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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP491EEN | 制造商:Exar Corporation 功能描述:Line Transceiver, 1-Driver, 1-Receiver, 14 Pin, Plastic, SOP |
| SP491EEN-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 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| SP491EEN-L | 制造商:Exar Corporation 功能描述:IC RS-485 TRANSCEIVER 5.25V NSOIC-14 |
| SP491EEN-L/TR | 功能描述:RS-485接口IC Full Duplex RS-485 s RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| SP491EEN-TR | 制造商:Exar Corporation 功能描述: 制造商:SIPEX 功能描述: |
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