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| 型号： | SP3072EEN-L |
| 厂商： | Exar Corporation |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/RS422 ESD 8NSOIC |
| 标准包装： | 98 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422/RS485 |
| 电源电压： | 3.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 其它名称： | 1016-1045-5 |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3070E-SP3078E_02_2020
4
DETaIlED DESCRIPTION
The SP307XE family of high speed trans-
ceivers for RS-485/RS-422 communication
contain one driver and one receiver. These
devices feature fail-safe circuitry, which
guaranteesalogic-highreceiveroutputwhen
the receiver inputs are open or shorted, or
when they are connected to a terminated
transmissionlinewithalldriversdisabled.The
SP3070E, SP3072E, SP3073E, SP3075E,
SP3076E and SP3078E also feature a
hotswap capability allowing live insertion
without error data transfer. The SP3070E,
SP307E and SP3072E feature reduced
slew-rate drivers that minimize EMI and
reduce reflections caused by improperly
terminated cables, allowing error-free data
transmission up to 250kbps. The SP3073E,
SP3074E and SP3075E also offer slew -rate
limitsallowingtransmitspeedsupto500kbps.
The SP3076E, SP3077E, SP3078E driver
slew rates are not limited, making transmit
speeds up to 6Mbps possible.
The SP3072E, SP3075E and SP3078E are
half-duplextransceivers,whiletheSP3070E,
SP307E, SP3073E, SP3074E, SP3076E,
and SP3077E are full duplex transceivers.
Alldevicesoperatefromasingle3.3Vsupply.
Driversareoutputshort-circuitcurrentlimited.
Thermal-shutdown circuitry protects drivers
against excessive power dissipation. When
activated, the thermal-shutdown circuitry
places the driver outputs into a high-imped-
ance state.
RECEIVER INPuT FIlTERING
SP3070E-SP3075E receivers incorporate
input filtering in addition to input hysteresis.
This filtering enhances noise immunity with
differential signals that have very slow rise
and fall times. Receiver propagation delay
increases by 25% due to this filtering.
FaIl SaFE
The SP3070E family guarantees a logic-high
receiver output when the receiver inputs are
shorted, open, or when they are connected
to a terminated transmission line with all
drivers disabled. If A - B is less than or equal
to -200mV, RO is logic low. In the case of a
terminated bus with all transmitters disabled
the receiver's differential input voltage is
pulled to ZeroV by the termination. With the
receiver thresholds of the SP3070E family,
this results in a logic high with a 50mV mini-
mum noise margin. In compliance with the
EIA/TIA-485 standard, the SP3070E family
has a 50mV - 200mV threshold.
HOT-SWaP CaPaBIlITy
When circuit boards are inserted into a hot
backplane, differential disturbances to the
data bus can lead to data errors. Upon initial
circuit board insertion, the data communica-
tion processor undergoes its own power-up
sequence.Duringthisperiod,theprocessor's
logic-output drivers are high impedance and
are unable to drive the DE and RE inputs
of these devices to a defined logic level.
Leakage currents up to 0A from the high-
impedance state of the processor's logic
drivers could cause standard CMOS enable
inputs of a transceiver to drift to an incor-
rect logic level. Additionally, parasitic circuit
board capacitance could cause coupling of
VCC or GND to the enable inputs. Without
the hot-swap capability, these factors could
improperly enable the transceiver's driver
or receiver.
When VCC rises, an internal pulldown circuit
holds DE low and RE high for approximately
0 microseconds. After the initial power-up
sequence, the pulldown circuit becomes
transparent, resetting the hot-swap toler-
able input.
15KV ESD PROTECTION
As with all Exar devices, ESD-protection
structures are incorporated on all pins to
protect against electrostatic discharges
encountered during handling and assembly.
The driver output and receiver inputs of
the SP3070E family of devices have extra
protection against static electricity. Exar's
engineering team have developed state
of the art structures to protect these pins
against ESD of 5kV without damage. The
DETaIlED DESCRIPTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3072EEN-L/TR | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| SP3072EMN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers |
| SP3072EMN/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers |
| SP3072EMN-L | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| SP3072EMN-L/TR | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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