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參數(shù)資料
| 型號(hào)： | SP481R |
| 英文描述： | High-Fanout Half-Duplex RS-485 Transceiver(高扇出，半雙工RS-485/RS-422收發(fā)器) |
| 中文描述： | 高扇出半雙工RS - 485收發(fā)器（高扇出，半雙工的RS-485/RS-422收發(fā)器） |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 83K |
| 代理商： | SP481R |
SP485RDS/08
SP485R RS-485 Serial Transceiver
6
Copyright 2000 Sipex Corporation
The receiver contains a enable pin (RE) which
enables the receiver when a logic LOW is
asserted. A logic HIGH will tri-state the
receiver output and the inputs will maintain
at least 120k
impedance. The receiver can
operate to at least 1Mbps.
The receiver also contains a fail-safe feature
which outputs a logic HIGH when the inputs are
open as in a disconnected cable.
SHUTDOWN MODE
The
SP481R
includes a shutdown function to
reduce power consumption. The shutdown is
activated by simultaneously applying a logic
LOW to DE and a logic HIGH to RE. While in
the shutdown mode, the power supply current is
typically less than 1
μ
A. The driver outputs are
disabled and are at a high impedance state
determined by the receiver input impedance
which should be at least 120k
. The receiver
output is at also at high impedance during
shutdow. Output leakage current when the
receiver is disabled is under 1
μ
A.
GENERAL DESCRIPTION
The
SP485R
is a low power RS-485 differential
transceiver. Similar to the SP485, the
SP485R
contains a half-duplex driver and receiver with
tri-state control. However, the SP485R is in-
tended for increased connections on a single bus
compared to the orignal RS-485 specification.
The RS-485 standard is ideal for multi-drop
applications where one bus can contain many
drivers and/or receivers. The RS-485 specifica-
tion allows up to 32 transceivers to be connected
on to the data bus. RS-485 is also specified for
driving higher speeds over long cable lengths of
up to 4,000 feet.
DRIVERS
The driver output complies with the RS-485
electrical characteristics as specified by the
standard. The output swings from 0V to V
CC
and
decreases to greater than +1.5V with a 54
load
attached between the two outputs. In adhering
to the RS-485 specification, the driver outputs
inherently comply with the RS-422 standard.
With a load of 100
between the two outputs,
the driver can sustain at least +2.0V.
The driver contains an enable pin (DE) which
tri-states the output when DE is a logic LOW.
The outputs
during the tri-stated condition are
at a high impedance (>100k
). A logic HIGH
enables the driver for normal operation. The
driver can operate to at least 5Mbps
.
RECEIVERS
The
SP485R
receiver has differential inputs
with an input sensitivity of lower than
±
200mV.
As mentioned above, the RS-485 specification
allows up to 32 transceivers on a the same bus.
The
SP485R
allows over 400 transceivers on
the same bus due to the high input impedance of
at least 98k
. This higher capacity allows
more components to be attached to the same
bus without degrading the signal quality. The
drivers are still able to drive an equivalent 54
from the 320 transceivers with an input
impedance of at least 120k
in parallel along
with the two 125
cable termination resistors
on each end.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP483E | Enhanced Low EMI Half-Duplex RS-485 Transceiver |
| SP483ECN | Enhanced Low EMI Half-Duplex RS-485 Transceiver |
| SP483ECP | Enhanced Low EMI Half-Duplex RS-485 Transceiver |
| SP483EEN | Enhanced Low EMI Half-Duplex RS-485 Transceiver |
| SP483EEP | Enhanced Low EMI Half-Duplex RS-485 Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP481RCN | 制造商:Exar 功能描述:High-Fanout Half-Duplex RS-485 Transceiver 制造商:Other 功能描述:High-Fanout Half-Duplex RS-485 Transceiver |
| SP481RCN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1/10th Unit Load RS-485 Transceiver |
| SP481RCP | 制造商:Exar 功能描述:High-Fanout Half-Duplex RS-485 Transceiver 制造商:Other 功能描述:High-Fanout Half-Duplex RS-485 Transceiver |
| SP481REN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1/10th Unit Load RS-485 Transceiver |
| SP481REN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1/10th Unit Load RS-485 Transceiver |
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