- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372167 > SP1486E +5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, 【15kV ESD-Protected PDF資料下載
參數(shù)資料
| 型號： | SP1486E |
| 英文描述： | +5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, 【15kV ESD-Protected |
| 中文描述： | 5V的，20Mbps的PROFIBUS的RS485/RS422收發(fā)器高級故障保護(hù)，八分之一單位負(fù)載，【15kV ESD保護(hù) |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 590K |
| 代理商： | SP1486E |
Rev J 3/8/2007
SP1486E PROFIBUS/RS485 Transceivers Copyright 2007 Sipex Corporation
12
DESCRIPTION
DETAILED DESCRIPTION
SP1486E is an advanced RS485/RS422 trans-
ceiver, ideal for PROFIBUS applications. Each
device contains one high speed driver and re-
ceiver capable of speeds up to 20Mbps with
low skew.
The device is designed for reliability in demand-
ing operating conditions. It features a fail-safe
circuitry that guarantees a logic-high receiver
output when the receiver inputs are open or
shorted, or when they are connected to a termi-
nated transmission line with all drivers disabled.
Control inputs (DE and
RE
) also feature a hot-
swap capability allowing live insertion without
error data transfer.
The device operates from a single 5.0V supply.
Drivers are output short-circuit current limited.
Thermal-shutdown circuitry protects drivers
against excessive power dissipation. When ac-
tivated, the thermal-shutdown circuitry places
the driver outputs into a high-impedance state.
PROFIBUS (EN50170 or DIN1245)
The PROFIBUS standard originated in Europe
but has spread worldwide as an industrial field
-
bus for use in process automation and factory
control. There are a number of different imple-
mentations, but one of the most widely used is
PROFIBUS-DP (Process Field Bus - Distribut-
ed Peripherals). DP uses RS485 as its physical
layer along with a proprietary data-link layer.
ADVANCED FAIL SAFE
Ordinary RS485 differential receivers will be in
an indeterminate state whenever A - B is less
than ±200mV. This situation can occur when-
ever the data bus is not being actively driven.
The Advanced Failsafe feature of the SP1486E
guarantees a logic-high receiver output if the
receiver’s differential inputs are shorted, open-
circuit, or if they are shunted by a termination
resistor.
The receiver thresholds of the SP1486E are
very precise and offset by at least a 40mV noise
margin from ground. This results in a logic-high
receiver output at zero volts input differential
while maintaining compliance with the EIA/TIA-
485 standard of ±200mV.
HOT-SWAP CAPABILITY
When a micro-processor or other logic device
undergoes its power-up sequence its logic-out-
puts are typically at high impedance. In this
state they are unable to drive the DE and
RE
signals to a defined logic level. During this pe
-
riod, noise, parasitic coupling or leakage from
other devices could cause standard CMOS en-
able inputs to drift to an incorrect logic level.
If circuit boards are inserted into an energized
backplane (commonly called “l(fā)ive insertion” or
“hot-swap”) power may be suddenly applied to
all circuits. Without the hot-swap capability, this
situation could improperly enable the transceiv-
er’s driver or receiver, driving invalid data onto
shared busses and possibly causing driver con-
tention or device damage.
The SP1486E contains a special power-on-re-
set circuit that holds DE low and RE high for
approximately 10 microseconds. After this ini-
tial power-up sequence the hot-swap circuit
becomes transparent, allowing for normal, un-
skewed enable and disable timings.
±15KV ESD PROTECTION
ESD-protection structures are incorporated on
all pins to protect against electrostatic discharg-
es encountered during handling and assembly.
The driver output and receiver inputs have ex-
tra protection against static electricity. Sipex
uses state of the art structures to protect these
pins against ESD of ±15kV without damage.
The ESD structures withstand high ESD in all
states: normal operation, shutdown, and pow-
ered down. After an ESD event, the SP1486E
keeps working without latch-up or damage.
ESD protection can be tested in various ways.
The transmitter outputs and receiver inputs of
the SP1486E are characterized for protection
to the following limits
±15kV using the Human Body Model
±8kV using the Contact Discharge method
specified in IEC 1000-4-2
±15kV Air-gap
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP1486EEN-L | +5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, 【15kV ESD-Protected |
| SP1486EMN-L | +5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, 【15kV ESD-Protected |
| SP1490E | Full Duplex RS-485 Transceivers |
| SP1490ECN | Full Duplex RS-485 Transceivers |
| SP1490ECP | Full Duplex RS-485 Transceivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP1486EEN-L | 功能描述:RS-422/RS-485 接口 IC 5V 15kV PROFIBUS RS485/RS422 RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| SP1486EEN-L/TR | 功能描述:RS-422/RS-485 接口 IC 5V 15KV ESD PROFIBUS RS485/422 HALF-DUP RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| SP1486EMN-L | 功能描述:RS-422/RS-485 接口 IC 5V 15KV ESD PROFIBUS RS485/422 HALF-DUP RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| SP1486EMN-L/TR | 功能描述:RS-422/RS-485 接口 IC 5V 15KV ESD PROFIBUS RS485/422 HALF-DUP RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| SP1490 | 制造商:MURATA-PS 制造商全稱:Murata Power Solutions Inc. 功能描述:Telephony / CATV Uninterruptible Power Supply |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。