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SP339B PDF预览

SP339B

更新时间: 2024-11-26 01:13:11
品牌 Logo 应用领域
艾科嘉 - EXAR /
页数 文件大小 规格书
23页 719K
描述
TRANSCEIVER WITH INTERNAL TERMINATION

SP339B 数据手册

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SP339B  
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION  
NOVEMBER 2014  
REV. 1.0.0  
FEATURES  
GENERAL DESCRIPTION  
Rx enabled during Tx short circuit condition  
Pin selectable Cable Termination  
The SP339B is an advanced multiprotocol  
transceiver supporting RS-232, RS-485, and RS-422  
serial standards in a 40 pin QFN package. Integrated  
cable termination and four configuration modes allow  
all three protocols to be used interchangeably over a  
single cable or connector with no additional switching  
components. Full operation requires only four  
external charge pump capacitors.  
No external resistors required for RS-485/422  
termination and biasing  
3.3V or 5V Single Supply Operation  
Robust ESD Protection on bus pins  
±15kV IEC 61000-4-2 (Air Gap)  
± 8kV IEC 61000-4-2 (Contact)  
The RS-485/422 modes feature one driver and one  
receiver (1TX/1RX) in both half and full duplex  
configurations. The RS-232 mode (3TX/5RX)  
provides full support of all eight signals commonly  
used with the DB9 RS-232 connector. A dedicated  
diagnostic loopback mode is also provided.  
±15kV Human Body Model (HBM)  
Max Data Rate of 20Mbps in RS-485/422 Modes  
and up to 1Mbps in RS-232 Modes  
The high speed drivers operate up to 20Mbps in RS-  
485/422 modes, and up to 1Mbps in RS-232 mode.  
All drivers can be slew limited to 250kbps in any  
mode to minimize electromagnetic interference (EMI).  
Pin selectable 250kbps Slew Limiting  
3 Drivers, 5 Receivers RS-232/V.28  
1 Driver, 1 Receiver RS-485/422  
Full and Half Duplex Configuration  
1/8th Unit Load, up to 256 receivers on bus  
All transmitter outputs and receiver inputs feature  
robust electrostatic discharge (ESD) protection to   
±15kV IEC-61000-4-2 Air Gap, ±8kV IEC-61000-4-2  
Contact, and ±15kV Human Body Model (HBM).  
Each receiver output has full fail-safe protection to  
avoid system lockup, oscillation, or indeterminate  
states by defaulting to logic-high output level when  
the inputs are open, shorted, or terminated but  
undriven. No external biasing resistors are required.  
RS-485/422 Enhanced Failsafe for open, shorted,  
or terminated but idle inputs  
Space saving 6mm x 6mm QFN-40 Package  
Pin compatible with SP339E and SP338E  
The RS-232 receiver inputs include a 5kpull-down  
to ground. The RS-485/422 receiver inputs are high  
impedance (>96kwhen termination is disabled),  
TYPICAL APPLICATIONS  
Dual Protocol Serial Ports (RS-232 or RS-485/422)  
Industrial and Process Control Equipment  
Point-Of-Sale Equipment  
allowing up to 256 devices on  
a
single  
communication bus (1/8th unit load).  
The SP339B operates from a single power supply,  
either 3.3V or 5V, with low idle current (2mA typical in  
all modes). The shutdown mode consumes less than  
10µA for low power standby operation.  
Networking Equipment  
HVAC Controls Equipment  
Building Security and Automation Equipment  
ORDERING INFORMATION  
PART NUMBER  
SP339BER1-L  
PACKAGE  
40-pin QFN  
40-pin QFN  
OPERATING TEMPERATURE RANGE  
-40°C to +85°C  
DEVICE STATUS  
Active  
SP339BER1-L/TR  
-40°C to +85°C  
Active  
NOTE: -L = Green / RoHS Compliant, /TR = Tape and Reel  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com  

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