Datasheet > SP339B

SP339B

更新时间： 2024-11-07 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

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获取价格

数据手册

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SP339B 数据手册

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 5k pull-down

to ground. The RS-485/422 receiver inputs are high

impedance (>96k when 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

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

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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与SP339B相关器件

型号	品牌	获取价格	描述	数据表
SP339BER1-L	EXAR	获取价格	TRANSCEIVER WITH INTERNAL TERMINATION
SP339BER1-L/TR	EXAR	获取价格	TRANSCEIVER WITH INTERNAL TERMINATION
SP339E	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339ECR1-L	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339ECR1-L/TR	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339ECR1-LTR	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339EER1	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339EER1-0A	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339EER1-L	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
SP339EER1-L/TR	EXAR	获取价格	RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION

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