RS-485 datasheet, PDF - EEWORLD Datasheet

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RS-485: DescriptionTRIPLE LINE TRANSCEIVER, QCC40; Categorysemiconductor Analog mixed-signal IC; File Size280KB，23 Pages; ManufacturerExar [Exar Corporation]

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RS-485 Overview

TRIPLE LINE TRANSCEIVER, QCC40

RS-485 Parametric

Parameter Name	Attribute value
Number of functions	3
Number of terminals	40
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply voltage 1	3.46 V
Minimum supply voltage 1	3.14 V
Rated supply voltage 1	3.3 V
Processing package description	6 × 6 MM, green, MO-220VJJD-5, QFN-40
Lead-free	Yes
EU RoHS regulations	Yes
state	ACTIVE
packaging shape	SQUARE
Package Size	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
surface mount	Yes
Terminal form	NO
Terminal spacing	0.5000 mm
terminal coating	MATTE Tin
Terminal location	Four
Packaging Materials	UNSPECIFIED
Temperature level	INDUSTRIAL
Interface Type	line transceiver
Interface standards	EIA-232; V.28
Number of drive digits	3
Input properties	standard
Number of receiver bits	5

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SP339E

RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION

DECEMBER 2013

REV. 1.0.4

GENERAL DESCRIPTION

The SP339 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.

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.

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).

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.

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),

allowing up to 256 devices on a single communication

bus (1/8th unit load).

The SP339 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.

FEATURES

Pin selectable Cable Termination

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)

±15kV Human Body Model (HBM)

Max Data Rate of 20Mbps in RS-485/422 Modes

and up to 1Mbps in RS-232 Modes

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

RS-485/422 Enhanced Failsafe for open, shorted,

or terminated but idle inputs

Space saving 6mm x 6mm QFN-40 Package

Pin compatible with SP338E

TYPICAL APPLICATIONS

Dual Protocol Serial Ports (RS-232 or RS-485/422)

Industrial Computers

Industrial and Process Control Equipment

Point-Of-Sale Equipment

Networking Equipment

HVAC Controls Equipment

Building Security and Automation Equipment

ORDERING INFORMATION

ART

UMBER

SP339EER1-L

SP339EER1-L/TR

SP339ECR1-L

SP339ECR1-L/TR

ACKAGE

40-pin QFN

PERATING

EMPERATURE

ANGE

-40°C to +85°C

0°C to +70°C

EVICE

TATUS

Active

OTE

-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

RS-485 Related Products

	RS-485	SP339EER1-L	SP339EER1-TR	RS-422	RS-232
Description	TRIPLE LINE TRANSCEIVER, QCC40	TRIPLE LINE TRANSCEIVER, QCC40	TRIPLE LINE TRANSCEIVER, QCC40	TRIPLE LINE TRANSCEIVER, QCC40	GREENLEE TEXTRON - RS-232 - TOOLS; HOLE PUNCH
Number of functions	3	3	3	3	-
Number of terminals	40	40	40	40	-
Maximum operating temperature	85 Cel	85 Cel	85 Cel	85 Cel	-
Minimum operating temperature	-40 Cel	-40 Cel	-40 Cel	-40 Cel	-
Maximum supply voltage 1	3.46 V	3.46 V	3.46 V	3.46 V	-
Minimum supply voltage 1	3.14 V	3.14 V	3.14 V	3.14 V	-
Rated supply voltage 1	3.3 V	3.3 V	3.3 V	3.3 V	-
Processing package description	6 × 6 MM, green, MO-220VJJD-5, QFN-40	6 × 6 MM, green, MO-220VJJD-5, QFN-40	6 × 6 MM, green, MO-220VJJD-5, QFN-40	6 × 6 MM, green, MO-220VJJD-5, QFN-40	-
Lead-free	Yes	Yes	Yes	Yes	-
EU RoHS regulations	Yes	Yes	Yes	Yes	-
state	ACTIVE	ACTIVE	ACTIVE	ACTIVE	-
packaging shape	SQUARE	SQUARE	SQUARE	SQUARE	-
Package Size	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	-
surface mount	Yes	Yes	Yes	Yes	-
Terminal form	NO	NO	NO	NO	-
Terminal spacing	0.5000 mm	0.5000 mm	0.5000 mm	0.5000 mm	-
terminal coating	MATTE Tin	MATTE Tin	MATTE Tin	MATTE Tin	-
Terminal location	Four	Four	Four	Four	-
Packaging Materials	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	-
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	-
Interface Type	line transceiver	line transceiver	line transceiver	line transceiver	-
Interface standards	EIA-232; V.28	EIA-232; V.28	EIA-232; V.28	EIA-232; V.28	-
Number of drive digits	3	3	3	3	-
Input properties	standard	standard	standard	standard	-
Number of receiver bits	5	5	5	5	-

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