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參數(shù)資料
| 型號： | SP491CS |
| 元件分類： | RS-485 |
| 英文描述： | Full Duplex RS-485 Transceivers |
| 中文描述： | 全雙工RS - 485接口收發(fā)器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 83K |
| 代理商： | SP491CS |
7
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
Copyright 2004 Sipex Corporation
DESCRIPTION
The
SP490
and
SP491
are full-duplex differential
transceivers that meet the requirements of
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
+12V) common 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 1.5V 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
SP490
and
SP491
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 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. A logic
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 receiver.
相關PDF資料 |
PDF描述 |
|---|---|
| SP491EN | Full Duplex RS-485 Transceivers |
| SP491ES | Full Duplex RS-485 Transceivers |
| SP490E | Enhanced Full Duplex RS-485 Transceivers |
| SP490ECN | Enhanced Full Duplex RS-485 Transceivers |
| SP490ECP | Enhanced Full Duplex RS-485 Transceivers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP491CS-L | 功能描述:RS-485接口IC RS485 5000 kbps temp 0C to 70C RoHS:否 制造商:Texas Instruments 數(shù)據速率: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 |
| SP491E | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced Full Duplex RS-485 Transceivers |
| SP491ECN | 制造商:Exar 功能描述:Enhanced Full Duplex RS-485 Transceivers 制造商:Other 功能描述:Enhanced Full Duplex RS-485 Transceivers |
| SP491ECN-L | 功能描述:RS-485接口IC RS485 10000 kbps 5V temp 0C to 70C RoHS:否 制造商:Texas Instruments 數(shù)據速率: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 |
| SP491ECN-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 |
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