參數(shù)資料
型號(hào)： SP1491EEN
元件分類(lèi)： 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(yè)數(shù)： 5/10頁(yè)
文件大?。?/td> 73K
代理商： SP1491EEN
5
Date: 5/18/04
SP1490E/1491E Full Duplex RS-485 Transceivers
Copyright 2004 Sipex Corporation
The
SP1490E
and
SP1491E
are full-duplex dif-
ferential 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
SP1490E
and
SP1491E
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
SP1491E
has a driver enable
control line which is active high. A logic high
on DE (pin 4) of the
SP1491E
will enable
the differential driver outputs. A logic low
on DE (pin 4) of the
SP1491E
will tri-state the
driver outputs. The
SP1490E
does not have a
driver enable.
Receiver...
The receivers for both the
SP1490E
and
SP1491E
have differential inputs with an input
sensitivity as low as
±
200mV. Input impedance
of the receivers is typically 15K
(12K
mini-
mum). A wide common mode range of -7V to
+12V allows for large ground potential differ-
ences between systems. The receivers for both
the
SP1490E
and
SP1491E
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 and floating.
The receiver of the
SP1491E
has a receiver
enable control line which is active low. A logic
low on REB (pin 3) of the
SP1491E
will enable
the differential receiver. A logic high on REB
(pin 3) of the
SP1491E
will tri-state the re-
ceiver.
S
T
U
P
N
I
S
T
U
P
T
U
O
E
E
1
D
9
y
o
4
1
P
S
I
D
Y
Z
1
1
0
1
0
x
1
0
z
0
1
z
INPUTS
OUTPUTS
RE
SP1491E
A-B
R
0
0
0
1
+0.2V
-0.2V
open
x
1
0
1
z
Transmit Function Truth Table
Recieve Function Truth Table
only
DETAILED DESCRIPTION
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP1491EEN/TR 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers
SP1491EEN-L 功能描述:RS-485接口IC RS485 w/shutdown 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SP1491EEN-L/TR 功能描述:RS-485接口IC 20MBPS FULL-DUPLEX RS485 W/+/-15KV ESD 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SP1491EENTR 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers
SP1491EEP 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers
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