sp336e Exar Corporation, sp336e Datasheet

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sp336e

Manufacturer Part Number
sp336e
Description
3.3v - 5v Programmable Rs-232/rs-485/rs-422 Serial Transceiver
Manufacturer
Exar Corporation
Datasheet

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MARCH 2010
GENERAL DESCRIPTION
The SP336E is a monolithic serial multi-transceiver
device that contains both RS-232 and RS-485/RS-
422 line drivers and receivers. The configuration of
the SP336E can be reconfigured into eight operating
modes including RS-232 only (4TX/4RX), RS-485/
RS-422 only (2TX/2RX) full or half duplex, two RS-
232/RS-485 mixed modes. two shutdown modes and
a diagnostic loop-back mode. Modes may be
selected at any time by changing the logic state of the
three MODE pins. The device can implement a dual-
mode serial port, mixed mode ports or as an interface
signal translator. The Exar charge pumps deliver true
RS-232 driver output voltages from a single power
supply at either 3.3V or 5V. The SP336E requires
only four
rate control pin configures driver outputs for either
high data rate or slew-controlled data rates. Slew-
controlled outputs minimize problems with reflections
and ringing on long or un-terminated cables. All RS-
485 receivers or transceivers feature high impedance
which allow up to 256 transceivers on a shared bus.
When configured in RS-485/RS-422 mode, each
driver may be individually enabled or put into tri-state,
simplifying use on shared buses or bidirectional
communication. All receivers have advanced failsafe
protection to prevent oscillation when inputs are un-
connected. In RS-232 mode each receiver input has
a 5k ohm pull-down to ground. Differential Receivers
will default to output logic 1 if inputs are floating,
shorted or open but terminated. All driver outputs and
receiver inputs are protected against ESD strikes up
to +/-15,000 volts.
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
0.1μF
capacitors for charge pump. A slew
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
(510) 668-7000
FEATURES
TYPICAL APPLICATIONS
3.3V or 5V Single Supply Operation
Robust +/-15kV ESD Protection (IEC 61000-4-2 Air
Gap)
Software Selectable Mode Selection
Up to 4 Drivers, 4 Receivers RS-232/V.28
Up to 2 Drivers, 2 Receivers RS-485/RS-422
Mixed RS-232/RS-485 modes
Pin Programmable Slew Rate for Reduced EMI
RS-485 Advanced Failsafe on Open, Short or
Terminated Lines
Diagnostic Loop-Back Function
28 Pin SOIC or TSSOP Packaging
Factory Automation Equipment
Security Networks
Industrial/Process Control Networks
Point-Of-Sales Equipment
Gaming Machines
Serial Protocol Translators (ex. RS-232 to RS-485/
RS-422)
Embedded Industrial PC’s
Building Environmental Control Systems (ex.
HVAC)
Cable Repeaters / Port Extenders / Hubs
Full or Half Duplex Configurations
1/8th Unit Load, up to 256 receivers on bus
FAX (510) 668-7017
www.exar.com
SP336E
REV. 1.0.0

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sp336e Summary of contents

Page 1

... MODE pins. The device can implement a dual- mode serial port, mixed mode ports interface signal translator. The Exar charge pumps deliver true RS-232 driver output voltages from a single power supply at either 3.3V or 5V. The SP336E requires only four 0.1μF capacitors for charge pump. A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates ...

Page 2

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER RS-232 A IGURE YPICAL PPLICATION C IRCUIT 2 REV. 1.0.0 ...

Page 3

... C1+ V+ C2+ C1- C2- V- ORDERING INFORMATION P N ART UMBER SP336ECT-L SP336ECY-L SP336EET-L SP336EEY SP336E 7 22 SOIC/ TSSOP PERATING P ACKAGE R 28-pin SOIC-W 0°C to +70°C 28-pin TSSOP 0°C to +70°C 28-pin SOIC-W -40° ...

Page 4

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER RS-485 A IGURE YPICAL PPLICATION C IRCUIT 4 REV. 1.0.0 ...

Page 5

... High Impedance. I Mode Configuration pin 2. I Mode Configuration pin 0. I Slew Rate Control. Logic Low input will limit driver slew from either RS-232 or RS-485 to 250kbps Driver Input. 5 SP336E ESCRIPTION - ULL UPLEX ALF UPLEX T3 Driver Enable Active High, R3 Enable Active Low. ...

Page 6

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER Pin Assignments UMBER IN AME 27 T2_In 28 T3_In Pin type: I=Input, O=Output, Pwr=Power supply, Pmp = Charge pump. D YPE INGLE NDED ULL I T2 Driver Input. T1 Driver Enable Active I T3 Driver Input. 6 REV. 1.0.0 ESCRIPTION ...

Page 7

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0.0 MODE CONFIGURATION O : PERATION M (M0, M1, M2) ODE RS-232 M ODE 4T/4R RS-232 001 7 SP336E IXED ROTOCOL ULL UPLEX 2T/2R RS-232 & 1T/1R RS-485 011 ...

Page 8

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER MODE CONFIGURATION (CONTINUED PERATION (M0, M1, M2) ODE P S OWER HUTDOWN H AT IGH IMPEDANCE 111 8 REV. 1.0.0 RS-485/RS-422 F D ULL UPLEX 2T/2R RS-485 101 ...

Page 9

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0.0 MODE CONFIGURATION (CONTINUED PERATION OOP TXO UT AND M (M0, M1, M2) ODE TXI RXO ACK RXI IGH MPEDANCE 000 9 SP336E IXED ROTOCOL ALF UPLEX 2T/3R RS-232 & 1T/1R RS-485 010 ...

Page 10

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER MODE CONFIGURATION (CONTINUED PERATION OW D RIVERS AT M (M0, M1, M2) ODE , OWER CTIVE H I IGH MPEDANCE 110 10 REV. 1.0.0 RS-485/RS-422 H D ALF UPLEX 4T/2R RS-485 & 2R RS-232 100 ...

Page 11

... MAX TYP NITS Load, MODE = 001. 6 Load, MODE = 101. μ MODE = 111. A 2.0 V Vcc = 3.3V. 2.4 V Vcc = 5.0V. 0.8 V μ +/-15 A 0.5 V Vcc OUT 0.6 0 OUT +/-20 +/- < Vo < Vcc. 11 SP336E . T YPICAL VALUES ARE AT C ONDITIONS = -1.5mA. = 2.5mA. ...

Page 12

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER +3.3V +/-5% NLESS OTHERWISE NOTED 3.3V + YMBOL ARAMETERS I Receiver Output Leakage Current OZ SINGLE-ENDED RECEIVER INPUTS (RS-232) Input Voltage Range Input Threshold Low Input Threshold HIGH Input Hysteresis Input Resistance DIFFERENTIAL RECEIVER INPUTS (RS-485 / RS-422) ...

Page 13

... Figures 7 and 8. 900 ns Figures 9, 10, 11 and 12. 900 ns Figures 9, 10, 11 and 12. 150 ns Figures 13 and 14 Figures 15 and 16 Figures 15 and 17 Figures 15 and 18. 13 SP336E . T YPICAL VALUES ARE AT C ONDITIONS = 3kΩ 1000pF 150pF. = 150pF. Ω =25° Ω 150pF to 1000pF 3kΩ 250pF ...

Page 14

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER +3.3V +/-5% NLESS OTHERWISE NOTED 3.3V + YMBOL ARAMETERS t Receiver Output Low to Disable LZ RS-485/RS-422 (SLEW = Vcc, 10Mbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate Differential Output Propagation DPHL DPLH Delay Time ...

Page 15

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0.0 1.0 FUNCTION TABLES The SP336E drivers and receivers may be configured to operate as either standard RS-485/RS-422 or RS-232 devices. RS-485/RS422 drivers have differential outputs and receivers have differential inputs. RS-232 drivers and receivers are single-ended with inverting outputs. ...

Page 16

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER F 4. RS-485 IGURE RIVER EST RS-485 D C IGURE RIVER OMMON Vcc F 6. RS-485 D O IGURE RIVER UTPUT Vcc Vcc C IRCUIT ODE ...

Page 17

... ELAY EST IRCUIT 54Ω 3.3V IAGRAM Vcc PLH PHL 1/ DPLH DPHL 90% 10 SKEW DPLH DPHL ISABLE EST IRCUIT Vcc 50pF L 50Ω 17 SP336E C L 50pF Vcc/2 1/2V O 90% 10 OUT R = 500Ω L ...

Page 18

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER F 10. RS-485 D E IGURE RIVER NABLE AND DE OUT F 11. RS-485 D E IGURE RIVER NABLE AND GENERATOR F 12. RS-485 D E IGURE RIVER NABLE AND DE OUT ISABLE IMING IAGRAM t DZH Vcc)/ ...

Page 19

... RS-485 R E IGURE ECEIVER NABLE AND S3 1.5V -1.5V GENERATOR ELAY EST IRCUIT A OUT 15pF ELAY IMING IAGRAM t PHL 1. ISABLE IMES EST IRCUIT OUT A 1kΩ 15pF L 50Ω 19 SP336E +1V -1V t PLH Vcc S2 ...

Page 20

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER F 16. RS-485 R E IGURE ECEIVER NABLE AND S1 is open closed 1.5V RE OUT F 17. RS-485 R E IGURE ECEIVER NABLE AND S1 is closed open -1.5V RE OUT ISABLE IMES IMING IAGRAM 3V 1. ...

Page 21

... S1 is closed open -1.5V RE OUT F 20. RS-232 D O IGURE RIVER UTPUT GENERATOR ISABLE IMES IMING IAGRAM 1. ISABLE IMES IMING IAGRAM 3V 1. 0.25V LEW ATE EST IRCUIT 50Ω 21 SP336E OUT R L ...

Page 22

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER F 21. RS-232 D O IGURE RIVER UTPUT Input OUT 22. RS-232 R P IGURE ECEIVER ROPAGATION GENERATOR F 23. RS-232 R P IGURE ECEIVER ROPAGATION 1.5V Input OUT LEW ATE IMING IAGRAM t t THL ELAY ...

Page 23

... REV. 1.0.0 2.0 SUGGESTED APPLICATION DIAGRAMS The SP336E supports all signals used in RS-232 over an 8 pin modular jack (RJ-45) as defined in TIA/EIA- 561. For DTE serial port only three drivers are required. Driver_1 is not used in this configuration and its driver input should be tied to high or low. ...

Page 24

... On a half-duplex channel RxD should be held in MARK state (binary 1) when receiver 3 is inactive. Driver 1 on the SP336E can be used to generate DSR or CTS signal to indicate to the host terminal that the translator is powered-on and ready. ...

Page 25

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0.0 F 26. RS-232 / RS-485 T IGURE RANSLATOR ALF UPLEX ABLE XTENDER 25 SP336E 010) ODE ...

Page 26

... For applications where multiple nodes are allowed to transmit, some type of bus arbitration should be used. One technique would be to use SP336E in conjunction with external decoder logic, packet buffers and node address fields embedded in the data stream. Receiving the correct node address triggers Tx_EN to pass data onward ...

Page 27

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0.0 F 28. RS-485 B -R IGURE US EPEATER (M 100) ODE 27 SP336E ...

Page 28

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER F 29 SOICW P IGURE IN ACKAGE O D UTLINE RAWING 28 REV. 1.0.0 ...

Page 29

... PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.0 TSSOP P IGURE IN ACKAGE O D UTLINE RAWING 29 SP336E ...

Page 30

... SP336E 3. PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REVISION HISTORY D R ATE EVISION March 2010 1.0.0 Production Release. EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement ...

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