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參數(shù)資料
| 型號(hào)： | SP1486EEN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 4/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/422 PROFIBUS 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP486E_0_0070
2
DESCRIPTION
DETAILED DESCRIPTION
SP486E 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 DIN19245)
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 SP486E
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 SP486E 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 SP486E contains a special power-on-re-
set circuit that holds DE low and RE high for
approximately 0 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 assem-
bly. The driver output and receiver inputs have
extra protection against static electricity. Exar
uses state of the art structures to protect these
pins against ESD of ±5kV without damage.
The ESD structures withstand high ESD in all
states: normal operation, shutdown, and pow-
ered down. After an ESD event, the SP486E
keeps working without latch-up or damage.
ESD protection can be tested in various ways.
The transmitter outputs and receiver inputs of
the SP486E are characterized for protection to
the following limits
±5kV using the Human Body Model
±8kV using the Contact Discharge method
specified in IEC 1000-4-2
±5kV Air-gap
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SP1490E | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
| SP1490E_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Full Duplex RS-485 Transceivers |
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