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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
MARCH 2010 REV. 1.0.0
GENERAL DESCRIPTION
The SP336E is a monolithic serial multi-transceiver device that contains both RS-232 and RS-485/RS422 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 RS232/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 dualmode 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 0.1F capacitors for charge pump. A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. Slewcontrolled outputs minimize problems with reflections and ringing on long or un-terminated cables. All RS485 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 unconnected. 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.
FEATURES
* 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

Full or Half Duplex Configurations 1/8th Unit Load, up to 256 receivers on bus
* 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
TYPICAL APPLICATIONS
* 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
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510) 668-7000 * FAX (510) 668-7017 * www.exar.com
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
FIGURE 1. TYPICAL RS-232 APPLICATION CIRCUIT
2
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 2. PIN OUT ASSIGNMENT
T4_In MODE_1 T4_Out T3_Out Vcc T1_Out T2_Out GND C1+ V+ C2+ C1C2V-
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23
T3_In T2_In T1_In SLEW MODE_0 MODE_2 R4_Out R3_Out R2_Out R1_Out R4_In R3_In R2_In R1_In
SP336E SOIC/ TSSOP
22 21 20 19 18 17 16 15
ORDERING INFORMATION
PART NUMBER SP336ECT-L SP336ECY-L SP336EET-L SP336EEY-L PACKAGE 28-pin SOIC-W 28-pin TSSOP 28-pin SOIC-W 28-pin TSSOP OPERATING TEMPERATURE RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C DEVICE STATUS Active Active Active Active
3
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
FIGURE 3. TYPICAL RS-485 APPLICATION CIRCUIT
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SP336E
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3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
PIN DESCRIPTIONS
Pin Assignments
PIN NUMBER 1 PIN NAME T4_In TYPE I DESCRIPTION SINGLE ENDED T4 Driver TTL input. FULL-DUPLEX T3 Driver Enable Active High. Mode Configuration pin 1. T4 Driver Output. T3 Driver Output. T3(A) Output. T3(B) Output. Power Supply Voltage. T1 Driver Output. T2 Driver Output. Ground. Positive terminal of positive flying capacitor. Vdd storage capacitor. Positive terminal of negative flying capacitor. Negative terminal of positive flying capacitor. Negative terminal of negative flying capacitor. Vss storage capacitor. R1 Receiver Input. R2 Receiver Input. R3 Receiver Input. R4 Receiver Input. R1(A) Receiver Input. R1(B) Receiver Input. R3(A) Receiver Input. R3(B) Receiver Input. R1 Receiver Output. R2 Receiver Output. High Impedance. R3 Receiver Output. R4 Receiver Output. High Impedance. Mode Configuration pin 2. Mode Configuration pin 0. Slew Rate Control. Logic Low input will limit driver slew from either RS-232 or RS-485 to 250kbps. T1 Driver Input. R4 Receiver Output. R2 Receiver Output. High Impedance. R2 Receiver Input. High Impedance. R4 Receiver Input. T1(A) Output. T1(B) Output. T1(A) Output, R1(A) Input. T1(B) Output, R1(B) Input. T3(A) Output, R3(A) Input. T3(B) Output, R3(B) Input. HALF-DUPLEX T3 Driver Enable Active High, R3 Enable Active Low.
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
Mode_1 T4_Out T3_Out Vcc T1_Out T2_Out GND C1+ V+ C2+ C1C2VR1_In R2_In R3_In R4_In R1_Out R2_Out R3_Out R4_Out Mode_2 Mode_0 SLEW T1_In
I O O Pwr O O Pwr Pmp Pmp Pmp Pmp Pmp Pmp I I I I I I I I I I I I
5
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER Pin Assignments
PIN NUMBER 27 PIN NAME T2_In TYPE I DESCRIPTION SINGLE ENDED T2 Driver Input. FULL-DUPLEX HALF-DUPLEX
REV. 1.0.0
T1 Driver Enable Active T1 Driver Enable Active High. High and R1 Receiver Enable Active Low. T3 Driver Input.
28
T3_In
I
Pin type: I=Input, O=Output, Pwr=Power supply, Pmp = Charge pump.
6
SP336E
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3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
MODE CONFIGURATION
OPERATION:
RS-232 MODE 4T/4R RS-232
MIXED-PROTOCOL FULL DUPLEX 2T/2R RS-232 & 1T/1R RS-485 011
MODE (M0, M1, M2)
001
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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
MODE CONFIGURATION (CONTINUED)
OPERATION:
LOW POWER SHUTDOWN ALL I/O AT HIGH IMPEDANCE
RS-485/RS-422 FULL DUPLEX 2T/2R RS-485 101
MODE (M0, M1, M2)
111
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SP336E
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3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
MODE CONFIGURATION (CONTINUED)
OPERATION:
LOOP-BACK TXIN TO RXOUT TXOUT AND RXIN HIGH IMPEDANCE
MIXED-PROTOCOL HALF DUPLEX 2T/3R RS-232 & 1T/1R RS-485 010
MODE (M0, M1, M2)
000
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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
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MODE CONFIGURATION (CONTINUED)
OPERATION:
LOW POWER, 4 RX ACTIVE DRIVERS AT HIGH IMPEDANCE
RS-485/RS-422 HALF DUPLEX 4T/2R RS-485 & 2R RS-232 100
MODE (M0, M1, M2)
110
10
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device.
Supply Voltage VCC Receiver Input VIN (DC Input Voltage) Input Voltage at TTL input Pins Driver Output Voltage (from Ground) Short Circuit Duration, TXout to GND Storage Temperature Range Lead Temperature (soldering, 10s) Power Dissipation 28-pin SOIC-W (derate 17mW/C above +70C) Power Dissipation 28-pin TSSOP (derate 12mW/C above +70C)
+6.0V -15V to +15V -0.3V to Vcc + 0.5V -7.5V to +12.5V Continuous -65C to + 150C +300C 938mW 657mW
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed.
ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%; TA = TMIN TO TMAX. TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL DC CHARACTERISTICS ICC ICC ICC Supply Current (RS-232) Supply Current (RS-485) Vcc Shutdown Current 2 6.5 1 30 20 20 mA mA No Load, MODE = 001. No Load, MODE = 101. MODE = 111. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
A
V V
TRANSMITTER and LOGIC INPUT PINS: Pins 1, 2, 23, 24, 25, 26, 27, 28 VIH VIH VIL IIL VHYS Logic Input Voltage HIGH Logic Input Voltage HIGH Logic Input Voltage LOW Logic Input Pull-up Current Logic Input Hysteresis 0.5 2.0 2.4 0.8 +/-15 Vcc = 3.3V. Vcc = 5.0V.
V
A
V
RS-232 and RS-485/422 RECEIVER OUTPUTS: Pins 19, 20, 21, 22 VOH VOL IOSS Receiver Output Voltage HIGH Receiver Output Voltage LOW Receiver Output Short-Circuit Current +/-20 Vcc0.6 0.4 +/-60 V V mA IOUT = -1.5mA. IOUT = 2.5mA. 0 < Vo < Vcc.
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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%; TA = TMIN TO TMAX. TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL IOZ PARAMETERS Receiver Output Leakage Current MIN. TYP. +/0.05 MAX. +/-1 UNITS CONDITIONS Receivers Disabled.
A
SINGLE-ENDED RECEIVER INPUTS (RS-232) Input Voltage Range Input Threshold Low -15 0.6 0.8 Input Threshold HIGH 1.2 1.5 1.5 1.8 Input Hysteresis Input Resistance DIFFERENTIAL RECEIVER INPUTS (RS-485 / RS-422) RIN VTH VTH IIN Receiver Input Resistance Receiver Differential Threshold Voltage Receiver Input Hysteresis Input Current 96 -200 -125 30 125 -100 SINGLE-ENDED DRIVER OUTPUTS (RS-232) VO Output Voltage Swing +/-5.0 +/-5.4 +/-6.0 Short Circuit Current Power Off Impedance 300 10M +/-60 V V mA Output Loaded with 3k to GND. No Load Output. VO = 0V. Vcc = 0V; VO = +/-2V. -50 k mV mV VCM = 0V. DE = 0V, VIN = 12V, Full-Duplex. DE = 0V, VIN = -7V, Full-Duplex. -7V VCM +12V. 3 0.5 5 7 2.0 2.4 +15 V V V V V V k VCC = 3.3V. VCC = 5.0V. VCC = 3.3V. VCC = 5.0V.
A A
Vcc Vcc Vcc Vcc +0.2 3 0.2 +/-250 +/-100 V V V V V V V mA
DIFFERENTIAL DRIVER OUTPUTS (RS-485 / RS-422) VOD Differential Driver Output (Tx_Out) 2 1.5 1.5 1.5 VOD VOC VOC Change In Magnitude of Differential Output Voltage Driver Common Mode Output Voltage Change In Magnitude of Common Mode Output Voltage Driver Output Short Circuit Current IO Output Leakage Current -0.2 RL = 100 (RS-422), Figure 4. RL = 54 (RS-485), Figure 4. VCM = -7V, Figure 5. VCM = +12V, Figure 5. RL = 54 or 100, Figure 4. RL = 54 or 100, Figure 4. RL = 54 or 100, Figure 4. V = +12V to -7V, Figure 6. DE = 0V or Shutdown, VO = +12V to -7V.
A
12
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%; TA = TMIN TO TMAX. TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL ESD PROTECTION ESD Protection for Rx_In and Tx_Out pins +/-15 +/-8 +/-15 All Other Pins TIMING CHARACTERISTICS RS-232 (SLEW = GND, 250kbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate tPHL, tPLH tPHL-tPLH tPHL-tPLH tTHL, tTLH Receiver Propagation Delay Receiver Skew Driver Skew Transition-Region Slew Rate from +3.0V to -3.0V or -3.0V to +3.0V 6 250 100 50 100 30 kbps ns ns ns V/s Vcc = 3.3V, TA =25C, RL = 3k to 7k, CL = 150pF to 1000pF, Figures 20 and 21. RL = 3k, CL = 1000pF. CL = 150pF. CL = 150pF. +/-2 kV kV kV kV IEC 61000-4-2 Air Discharge. IEC 61000-4-2 Contact Discharge. Human Body Model. Human Body model. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
RS-232 (SLEW = Vcc, 1Mbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate tPHL, tPLH tPHL-tPLH tPHL-tPLH tTHL, tTLH Receiver Propagation Delay Receiver Skew Driver Skew Transition-Region Slew Rate from +3.0V to -3.0V or -3.0V to +3.0V 1 100 50 25 90 Mbps RL = 3k, CL = 250pF. ns ns ns V/s Vcc = 3.3V, RL = 3k to 7k, CL = 150pF to 1000pF. CL = 150pF, Figures 22 and 23. CL = 150pF.
RS-485/RS-422 (SLEW = GND, 250kbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate tDPHL, tDPLH tR, tF tDPHLtDPLH tDZH, tDZL tDHZ, tDLZ tPHL, tPLH tZH tZL tHZ Differential Output Propagation Delay Time Driver Rise and Fall Time Driver Propagation Delay Skew Driver Output Enable Time Driver Output Disable Time Receiver Propagation Delay Receiver Enable to Output High Receiver Enable to Output Low Receiver Output High to Disable 50 50 50 250 200 250 1500 1500 200 900 900 150 kbps ns ns ns ns ns ns ns ns ns RDIFF = 54, CL = 50pF. Figures 7 and 8. Figures 7 and 8. Figures 7 and 8. Figures 9, 10, 11 and 12. Figures 9, 10, 11 and 12. Figures 13 and 14. Figures 15 and 16. Figures 15 and 17. Figures 15 and 18.
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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%; TA = TMIN TO TMAX. TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL tLZ PARAMETERS Receiver Output Low to Disable MIN. TYP. 50 MAX. UNITS ns CONDITIONS Figures 15 and 19.
RS-485/RS-422 (SLEW = Vcc, 10Mbps, ONE TRANSMITTER SWITCHING) Maximum Data Rate tDPHL, tDPLH tR, tF tDPHLtDPLH tDZH, tDZL tDHZ, tDLZ tPHL, tPLH tZH tZL tHZ tLZ Differential Output Propagation Delay Time Driver Rise and Fall Time Driver Propagation Delay Skew Driver Output Enable Time Driver Output Disable Time Receiver Propagation Delay Receiver Enable to Output High Receiver Enable to Output Low Receiver Output High to Disable Receiver Output Low to Disable 32 32 40 40 60 10 10 120 25 10 900 900 150 Mbps RDIFF = 54, CL = 50pF. ns ns ns ns ns ns ns ns ns ns Figures 7 and 8. Figures 7 and 8. Figures 7 and 8. Figures 9, 10, 11 and 12. Figures 9, 10, 11 and 12. Figures 13 and 14. Figures 15 and 16. Figures 15 and 17. Figures 15 and 18. Figures 15 and 19.
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SP336E
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3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
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.
TABLE 1: R-485/RS-422 FULL DUPLEX: MODE 011 (T3, R3), MODE 101 (T1, T3, R1, R3)
DRIVERS Inputs Outputs Tx_In 1 0 x Tx(A) 0 1 High-Z Tx(B) 1 0 Inputs Rx(A) - Rx(B) > -50mV -200mV Open / Shorted RECEIVERS Output RxOut 1 0 1
Tx_EN
1 1 0
TABLE 2: R-485/RS-422 HALF DUPLEX: MODE 010 (T3, R3), MODE 100 (T1, T3, R1, R3)
TRANSMITTING Inputs DE/RE 1 1 0 TxIn 1 0 x Tx(A) 0 1 High-Z Outputs Tx(B) 1 0 High-Z DE/RE 1 1 0 0 0 RECEIVING Inputs Rx(A) - Rx(B) x x > -50mV -200mV Open / Shorted Outputs RxOut High-Z High-Z 1 0 1
TABLE 3: RS-232 MODE 001 (ALL TX AND RX), MODES 011, 010 (T1, T2, R1, R2), MODE 110 (R1- R4)
DRIVERS Input 0 1 Open Output 5V -5V -5V Input 3V -3V Open RECEIVERS Output 0 1 1
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SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
FIGURE 4. RS-485 DRIVER DC TEST CIRCUIT
RL/2 DI T VOD RL/2 VOC
VCC
FIGURE 5. RS-485 DRIVER COMMON MODE LOAD TEST
DE = 3.3V A DI = 0 or Vcc Tx B VOD 60
375
375
VCM
FIGURE 6. RS-485 DRIVER OUTPUT SHORT CIRCUIT TEST
EN = 0 or Vcc DI = 0 or Vcc D
A
IOSD 100 -7V to +12V V
B
16
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 7. RS-485 DRIVER PROPAGATION DELAY TEST CIRCUIT
A DI Tx B 3.3V VOD
RL 54
CL 50pF
FIGURE 8. RS-485 DRIVER TIMING DIAGRAM
Vcc DI 0V B A VDIFF VA - VB VO+ 0V VO- t DPLH 90% 10% tR t SKEW = |t DPLH - t DPHL| t DPHL 90% 10% tF VO 1/2VO Vcc/2 t PLH t PHL 1/2VO Vcc/2
FIGURE 9. RS-485 DRIVER ENABLE AND DISABLE TEST CIRCUIT
A Vcc DI Tx B
S1 OUT CL = 50pF RL = 500
GENERATOR
50
17
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER FIGURE 10. RS-485 DRIVER ENABLE AND DISABLE TIMING DIAGRAM
REV. 1.0.0
DE tDZH
Vcc Vcc/2 0
0.25V OUT VOM = (VOL + Vcc)/2 tDHZ 0
FIGURE 11. RS-485 DRIVER ENABLE AND DISABLE TEST CIRCUIT 2
Vcc RL = 500 A 0 DI Tx B CL = 50pF GENERATOR S1 OUT
50
FIGURE 12. RS-485 DRIVER ENABLE AND DISABLE TIMING DIAGRAM 2
Vcc Vcc/2 DE tDZL tDLZ OUT VOL VOM = (VOL + Vcc)/2 0.25V 0
18
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 13. RS-485 RECEIVER PROPAGATION DELAY TEST CIRCUIT
A VID B R RE
OUT CL 15pF
FIGURE 14. RS-485 RECEIVER PROPAGATION DELAY TIMING DIAGRAM
A B t PHL 1.5V OUT t PLH
+1V -1V VOH VOL
FIGURE 15. RS-485 RECEIVER ENABLE AND DISABLE TIMES TEST CIRCUIT
OUT 1.5V -1.5V S3 A B R RE 1k S2 S1 Vcc
CL= 15pF
GENERATOR
50
19
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
FIGURE 16. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 1
S1 is open, S2 is closed, S3 = 1.5V 3V 1.5V RE tZH VOH OUT VOH /2 0V
FIGURE 17. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 2
S1 is closed, S2 is open, S3 = -1.5V 3V 1.5V tZL 0V VCC
RE
OUT
VOL= VCC /2 VOL
20
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 18. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 3
S1 is open, S2 is closed, S3 = 1.5V 3V RE 0.25V 1.5V tHZ VOH 0V
OUT
FIGURE 19. RS-485 RECEIVER ENABLE AND DISABLE TIMES TIMING DIAGRAM 4
S1 is closed, S2 is open, S3 = -1.5V 3V 1.5V 0V tLZ VCC
RE
OUT
0.25V VOL
FIGURE 20. RS-232 DRIVER OUTPUT SLEW RATE TEST CIRCUIT
Tx GENERATOR 50 CL RL
OUT
21
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
REV. 1.0.0
FIGURE 21. RS-232 DRIVER OUTPUT SLEW RATE TIMING DIAGRAM
3V Input 1.5V 0
+3V OUT VOL tTHL tTLH -3V
FIGURE 22. RS-232 RECEIVER PROPAGATION DELAY TEST CIRCUIT
Rx GENERATOR 50 CL
OUT
FIGURE 23. RS-232 RECEIVER PROPAGATION DELAY TIMING DIAGRAM
Input
1.5V
+3V 1.5V -3V tPHL tPLH VOH
OUT
50%
50% VOL
22
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
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/EIA561. 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. SP336E may also be used to implement a standard serial port over a DB-9 connector (TIA/EIA-574 or the standard IBM serial port). In that case either DSR or RI signal can be supported. Both DSR and RI are used mainly for dial-up connections and are typically not needed on dedicated lines. If both signals are required, add a discrete transceiver such as SP3220E. An alternative implementation would be to use the SP336E to emulate the functionality of two dual-channel RS-232 transceivers (2 x SP232's or equivalent). Loop-Back Changing from RS-232 mode (MODE 001) to loop-back mode (MODE 000) duplicates the function of an external loop-back plug. Loop-back can be used to test serial port functionality or to diagnose faults. FIGURE 24. RS-232E SERIAL PORT (EIA-561 / EIA-574)
23
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER RS-232 to RS-485 Translator SP336E can be used to implement a single-chip RS-232 to RS-485 translator function. Both full-duplex (4-wire RS-485) and half-duplex (2-wire RS-485) configurations are shown. RS-485 is capable of communicating on data cables up to 4000 feet (1200 meter) which makes it an ideal interface for extending the reach of shortrange serial ports like RS-232. The configurations shown can be used to connect directly to existing PC type RS-232 serial ports to enable extended-reach communication. The RTS signal (circuit CA or 105) is used as a transmit direction control signal for half-duplex. The ON condition puts the repeater into transmit mode and inhibits receive. 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. Shutdown Modes SP336E features two shutdown modes. In mode 111 (full shutdown) all drivers and receivers are at high impedance. In mode 110, all drivers are tri-state but all four receivers remain active. In modes 101 and 100 two differential receivers can be kept active while the differential drivers are tri-stated using the Tx_EN inputs. FIGURE 25. RS-232 / RS-485 TRANSLATOR FULL-DUPLEX CABLE-EXTENDER (MODE 011)
REV. 1.0.0
24
SP336E
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3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 26. RS-232 / RS-485 TRANSLATOR HALF-DUPLEX CABLE-EXTENDER (MODE 010)
25
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER Bus Repeater Mode 101 can be used as a bus-repeater to extend the reach of an RS-422 bus. This configuration is best suited for point-to-point or multi-drop communications because the drivers are always active and echoing data from their corresponding receiver. 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. Mode 100 could implement a repeater / gateway to partition or extend RS-485 networks. Direction Control determines when data is forwarded to or from segments A and B.
REV. 1.0.0
FIGURE 27. RS-422 BUS-REPEATER (MODE 101)
26
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 28. RS-485 BUS-REPEATER (MODE 100)
27
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER FIGURE 29. 28 PIN SOICW PACKAGE OUTLINE DRAWING
REV. 1.0.0
28
SP336E
REV. 1.0.0
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 30. 28 PIN TSSOP PACKAGE OUTLINE DRAWING
29
SP336E
3.3V - 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REVISION HISTORY
DATE March 2010 REVISION 1.0.0 Production Release. DESCRIPTION
REV. 1.0.0
NOTICE 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. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2010 EXAR Corporation Datasheet March 2010. Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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