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參數(shù)資料
| 型號： | SP1491ECN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485 FULL DUPLEX 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC（窄型） |
| 包裝： | 帶卷 (TR) |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP490_SP49E_0_05243
TheSP1490EandSP1491Earefull-duplexdif-
ferentialtransceiversthatmeettherequirements
ofRS-485andRS-422.FabricatedwithaExar
proprietary BiCMOS process, both products
requireafractionofthepowerofolderbipolar
designs.
The RS-485 standard is ideal for multi-drop
applications or for long-distance interfaces.
RS-485allowsupto32driversand32receiv-
ers to be connected to a data bus, making it
an ideal choice for multi-drop applications.
Sincethecablingcanbeaslongas4,000feet,
RS-485transceiversareequippedwithawide
(-7Vto+12V)commonmoderangetoaccom-
modate ground potential differences. Because
RS-485isadifferentialinterface,dataisvirtually
immunetonoiseinthetransmissionline.
driver...
ThedriversforboththeSP1490EandSP1491E
have differential outputs. The typical voltage
outputswingwithnoloadwillbe0voltsto+5
volts. With worst case loading of 54 across
thedifferentialoutputs,thedrivercanmaintain
greaterthan1.5Vvoltagelevels.
ThedriveroftheSP1491Ehasadriverenable
control line which is active high. A logic high
on DE (pin 4) of the SP1491E will enable
thedifferentialdriveroutputs.
AlogiclowonDE(pin4)oftheSP1491Ewill
tri-statethedriveroutputs.TheSP1490Edoes
nothaveadriverenable.
receiver...
ThereceiversforboththeSP1490EandSP1491E
have differential inputs with an input sensitiv-
ityaslowas±200mV.Inputimpedanceofthe
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 for both the
SP1490E and SP1491E are equipped with
the fail-safe feature. Fail-safe guarantees that
thereceiveroutputwillbeinahighstatewhen
theinputisleftunconnectedandfloating.
The receiver of the SP1491E has a receiver
enablecontrollinewhichisactivelow.Alogic
lowonREB(pin3)oftheSP1491Ewillenable
the differential receiver. A logic high on REB
(pin 3) of the SP1491E will tri-state the re-
ceiver.
INPUTS
OUTPUTS
DE
SP1491E only
DI
Y
Z
1
0
1
0
x
1
0
z
0
1
z
INPUTS
OUTPUTS
RE
SP1491E
A-B
R
0
1
+0.2V
-0.2V
open
x
1
0
1
z
Transmit Function Truth Table
Recieve Function Truth Table
only
dEtaiLEddEScriPtion
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP1491ECNTR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
| SP1491ECP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
| SP1491ECP-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP1491EEN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
| SP1491EEN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
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