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參數(shù)資料
| 型號： | SP491ES-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 FULL DUPLEX 14PDIP |
| 產(chǎn)品變化通告： | Interface Product Discontinuation 10/May/2011 |
| 標準包裝： | 25 |
| 類型： | 收發(fā)器 |
| 驅動器/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
SP490,49_0_0627
DESCRIPTION
The
SP490andSP491arefull-duplexdifferen-
tialtransceiversthatmeettherequirementsof
RS-485 and RS-422. Fabricated with a
Sipex proprietary BiCMOS process, both
products require a fraction of the power of
older bipolar 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...
The drivers for both the
SP490 and SP491
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
SP491 has a driver enable
control line which is active high. A logic high
on DE (pin 4) of the
SP491 will enable
the differential driver outputs. A logic low
on DE (pin 4) of the
SP491 will tri-state the
driver outputs. The
SP490 does not have a
driver enable.
Receiver...
The receivers for both the
SP490andSP491
havedifferentialinputswithaninputsensitiv-
ityaslowas±200mV.Inputimpedanceofthe
receivers is typically 15k (12k minimum).
A wide common mode range of -7V to +2V
allows for large ground potential differences
between systems.The receivers for both the
SP490 and SP491 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
SP491 has a receiver
enable control line which is active low.Alogic
low on REB (pin 3) of the
SP491 will enable
the differential receiver. A logic high on REB
(pin 3) of the
SP491 will tri-state the re-
ceiver.
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相關代理商/技術參數(shù) |
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| SP495CT | 制造商:Exar Corporation 功能描述:Line Transceiver, 4-Driver, 4-Receiver, 20 Pin, Plastic, SOP |
| SP495CT-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER RS-485 QUAD WSOIC20 |
| SP495ET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Quad Differential RS-485 Transceiver |
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