ST ST3237 3 TO 5.5V 250KBPS RS-232 TRANSCEIVER WITH STAND-BY handbook
Contents
1. 0 125 Figure 4 Transfer Characteristics for Receiver 0301960 Vo V 6 4 5 2 lt 55 Ta 125 C 8 0 0 5 1 1 5 2 25 3 Figure 5 Output Current vs Output High Voltage 0501900 lon mA 1 Vec 3 3V 2 3 4 25 6 5 gaze L 59 8 3 5 3 2 5 2 5 1 0 5 Figure 6 Output Current vs Output Low Voltage lo mA 0501910 55 25 125 3 3 0 5 1 5 573237 7 mA 6 5 8 12 Receiver Input Resistance 501920 5 5V 0 05 16 2 ON5 3 v 573237 50 28 MECHANICAL DATA mm inch DIM MIN TYP MAX MIN TYP MAX A 2 65 0 104 al 0 1 0 3 0 004 0 012 b 0 35 0 49 0 014 0 019 ci 45 typ F 7 40 7 60 0 291 0 300 L 0 50 1 27 0 020 0 050 S 8 max 0016023 9 12 573237 SSOP28 MECHANICAL DATA mm inch DIM MIN TYP MAX MIN TYP MAX A 2 0 079 A1 0 050 02. 40 to 85 C unless otherwise specified Typical values are referred to T4 25 Symbol Parameter Test Conditions Min Typ Max Unit IsuPPLv Vcc Power Supply Current Load Voc 3Vor5 0V TA 25 0 5 2 mA Shutdown Supply Current SHDN GND 25 C 1 10 uA LOGIC INPUT ELECTRICAL CHARACTERISTICS C4 C4 0 1uF Voc to 5 5V 40 to 85 C unless otherwise specified Typical values are referred to T4 25 Symbol Parameter Test Conditions Min Typ Max Unit Input Logic Threshold Low T IN VHSCI SHDN 0 8 V Note 1 Input Logic Threshold High Voc 3 3V 2 V Note 1 Voc 5V 24 V Input Leakage Current T IN VHSCI EN SHDN t 0 01 t1 0 uA lo Output Leakage Current Receiver Disabled 0 05 10 Vo Output Voltage Low lour 1 6mA 0 4 V Output Voltage High lout 1mA 0 6 Vcc 0 1 V Note 1 Transmitter input hysteresis is typically 250mV TRANSMITTER ELECTRICAL CHARACTERISTICS C4 0 1uF tested at 3 3V 10 Vcc to 5 5V T4 40 to 85 C unless otherwise specified Typical values are referred to TA 25 Symbol Parameter Test Conditions Min Typ Max Unit Output Voltage Swing All Transmitter outputs are loaded with t5 5 4 V to GND Transmitter Output Voc V OV Vout 2
3. 002 A2 1 65 1 75 1 85 0 065 0 069 0 073 b 0 22 E 0 38 0 009 0 015 009 0 25 0 004 0 010 D 9 9 10 2 10 5 0 390 0 402 0 413 E 7 4 7 8 8 2 0 291 0 307 0 323 E1 5 5 3 5 6 0 197 0 209 0 220 e 0 65 BSC 0 0256 BSC K 0 10 0 10 L 0 55 0 75 0 95 0 022 0 030 0 037 D 10 12 E1 PIN 1 IDENTIFICATION 1 573237 TSSOP28 MECHANICAL DATA mm inch DIM MIN TYP MAX MIN TYP MAX A 1 2 0 047 A1 0 05 0 15 0 002 0 004 0 006 A2 1 05 0 031 0 039 0 041 0 0 19 umm 0 30 0 007 0 012 009 0 20 0 004 0 0089 D 9 6 9 7 9 8 0 378 0 382 0 386 E 6 2 6 4 6 6 0 244 0 252 0 260 E1 4 3 4 4 4 48 0 169 0 173 0 176 e 0 65 BSC 0 0256 BSC K 0 8 0 8 L 0 45 0 60 0 75 0 018 0 024 0 030 D r E1 PIN 1 IDENTIFICATION 1 0128292B 11 12 573237 Information furnished is believed to be accurate and reliable However STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics Specifications mentioned in this publication are subject to change without notice This publication supersedes and replaces all information previously supplied STMicroelectronics products are not authorized for use as critical components
4. Input Voltage 24 First Transmitter Input Voltage 25 C4 Negative Terminal of Voltage Charge Pump Capacitor 26 Supply Voltage 27 5 5V Generated by the Charge Pump 28 Positive Terminal of Voltage Charge Pump 2 12 573237 PIN CONFIGURATION RS a o 3 M a l lI 0 SS et ee s 500720 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Voc Supply Voltage 0 3 to 6 V Doubled Voltage Terminal 0 3 to 7 V V Inverted Voltage Terminal 0 3 to 7 V V 13 V Transmitter Input Voltage Range 0 3 to 6 V SHDN EN 0 3 to 6 V VHSCI Very High Speed Control Input 0 3 to Vcc 10 3 V RiN Receiver Input Voltage Range t25 V Tour Transmitter Output Voltage Range t13 2 V Rour Receiver Output Voltage Range 0 3 to Voc 0 3 V Short Circuit Durtion on Tour one at a time Continuous Tstg Storage Temperature Range 65 to 150 G Absolute Maximum Ratings are those values beyond which damage the device may occur Functional operation under these condition is not implied V and V can a maximum magnitude of 7V but their absolute addition can not exceed 13 V 4 3 12 573237 ELECTRICAL CHARACTERISTICS C4 C4 Voc 3V to 5 5V T4
5. in life support devices or systems without express written approval of STMicroelectronics The ST logo is a registered trademark of STMicroelectronics 2002 STMicroelectronics Printed in Italy Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia Brazil Canada China Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States http www st com 12 12
6. 218 ST3237 E I 513237 3 5 5V 250KBPS RS 232 TRANSCEIVER WITH STAND BY 1uA LOW POWER SHUTDOWN WITH RECEIVERS ACTIVE m GUARENTEED DATA RATE 250Kbps Normal Operation 1Mbps Very High Speed Operation m GUARANTEED SLEW RATE RANGE 6V us Normal Operation 24V us Very High Speed Operation 0 1uF EXTERNAL CAPACITORS FLOW THROUGH PINOUT 50014 LOW SUPPLY CURRENT MEET EIA TIA 232 SPECIFICATIONS DOWN TO 3V m AVAILABLE IN SO 28 SSOP 28 AND TSSOP28 DESCRIPTION The ST3237 is a 3V to 5 5V powered EIA TIA 232 and V 28 V 24 communication interfaces high data rate capabilities ST3237 is a transceiver 5 drivers 3 receivers for fast modem applications The device has a proprietary low dropout transmitter output stage providing true RS 232 performance from a 3V to 5 5V supply using a dual charge pump The device is guaranteed to run at data rates of 250Kbps in the normal ORDERING CODES operation mode and 1Mbps in the very high speed operation mode while maintaning RS 232 output levels Type Comments ST3237CD 0 to 70 C SO 28 Tube 27parts per tube 12tube per box ST3237BD 40 to 85 SO 28 Tube 27parts per tube 12tube per box ST3237CDR 0 to 70 C SO 28 Tape amp Reel 1000 parts per reel ST3237BDR 40 to 85 SO 28 Tape amp Reel 1000 parts per reel ST3237CPR 0 to 70 C SSOP 28 Tape amp Reel 1350 parts per reel ST3237BP
7. Normal Operation 80 ns Time topa Receiver Output Disable Normal Operation 130 ns Time Sar Transition Slew Rate Ta 25 C RL 3to7KQ 3 3V measured from 3V to 3V 3V to 150pF to 1000pF 6 30 V us C 150pF to 1000pF VHSCI Vcc i P V C 150pF to 2500pF VHSCI GND Transmitter Skew is measured at the transmitter zero cross points ky 5 12 573237 APPLICATION CIRCUITS LOGIC INPUTS RS232 OUTPUTS D gt gt gt R10UTB gt LOGIC OUTPUTS RS232 INPUTS A 0500711 CAPACITANCE VALUE uF Vcc 01 02 03 04 Cbypass 3 0 to 3 6 0 22 0 22 0 22 0 22 0 22 4 5 to 5 5 0 047 0 33 0 33 0 33 0 33 3 0 to 5 5 0 22 1 0 1 0 1 0 0 22 6 12 573237 TYPICAL PERFORMANCE CHARACTERISTICS unless otherwise specified 25 Figure 1 0 0 0 5 Input Voltage Range for Trasmitter 501950 30 20 10 0 10 20 V Figure 2 Transfer Characteristics for Transmitter 0501940 Vo V 4 Vec 3V Ta 125 C 6 55 0 0 5 1 5 2 2 5 V Figure 3 Transfer Characteristics for Receiver Vo V 6 4 2 501950 2 11 55
8. R 40 to 85 SSOP 28 Tape amp Reel 1350 parts per reel ST3237CTR 0 to 70 C TSSOP28 Tape amp Reel 2500 parts per reel ST3237BTR 40 to 85 TSSOP268 Tape amp Reel 2500 parts per reel Available on request May 2002 1 12 573237 PIN DESCRIPTION 2 SYMBOL NAME AND FUNCTION 1 Cot Positive Terminal of Inverting Charge Pump Capacitor 2 GND Ground 3 Co Negative Terminal of Inverting Charge Pump Capacitor 4 V 5 5V Generated by the Charge Pump 5 Tiour First Transmitter Output Voltage 6 T2ouT Second Transmitter Output Voltage 7 Third Transmitter Output Voltage 8 First Receiver Input Voltage 9 R2iN Second Receiver Input Voltage 10 T4ouT Fourth Transmitter Output Voltage 11 R3in Third Receiver Input Voltage 12 500 Fifth Transmitter Output Voltage 13 EN Receiver Enable Active Low 14 SHDN Shutdown Control Active Low 15 VHSCI Very High Speed Control Input Connect to GND for normal operation connect to for 1 Mbps transmission rates 16 RloUTB Non Inverting Complementary Receiver Output Always Active 17 T5in Fifth Transmitter Input Voltage 18 R3ourT Third Receiver Output Voltage 19 T4in Fourth Transmitter Input Voltage 20 R2out Second Receiver Output Voltage 21 R1out First Receiver Output Voltage 22 Third Transmitter Input Voltage 23 T2in Second Transmitter
9. V 3000 Resistance Output Short Circuit Current 25 60 RECEIVER ELECTRICAL CHARACTERISTICS C4 C4 0 14 tested at 3 3V 10 Voc to 5 5V T4 40 to 85 C unless otherwise specified Typical values are referred to T4 25 Symbol Parameter Test Conditions Min Typ Max Unit Receiver Input Voltage 25 25 V Operating Range RS 232 Input Threshold 2552 Vec 3 3V 0 6 1 2 V Low 25 5 0 8 1 5 V Vain RS 232 Input Threshold 2552 3 3V 1 5 2 4 V High Ta 25 C Voc 5V 1 8 24 V Input Hysteresis 0 3 V Resistance TA 25 C 3 5 7 4 12 ky TIMING CHARACTERISTICS C4 C4 0 1uF tested at 3 3V 10 Vcc to 5 5V T4 40 to 85 C unless otherwise specified Typical values are referred to T4 25 ST3237 Symbol Parameter Test Conditions Min Typ Max Unit Maximum Data Rate 1000 250 Kbps one trasmitter switching VHSCI GND 250 100 Kbps one trasmitter switching VHSCI Vcc Vcc 3 to 5 55V Propagation Delay Input to Ryy to Rour C 150pF 0 15 us Output tr skEw Transmitter Skew VHSCIZGND 100 ns triul VHSCI Vcc 60 ns 5 Receiver Skew 50 5 Receiver Output Enable
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ST ST3237 3 TO 5.5V 250KBPS RS 232 TRANSCEIVER WITH STAND BY handbook