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| ST3237EB 15 kV ESD protected, 1 A, 3 to 5.5 V, 250 kbps RS-232 transceiver with stand-by Features ESD protection for RS-232 I/O pins - 15 kV human body model - 8 kV IEC 1000-4-2 contacts discharge 1 A low power shutdown with receivers active Guaranteed data rate - 250 kbps (normal operation) - 1 Mbps (very high speed operation) Guaranteed slew rate range - 6 V/s (normal operation) - 24 V/s (very high speed operation) 0.1 F external capacitors Flow-through pinout Low supply current 300 A Available in SSOP28 and SO-28 operation mode and 1 Mbps in the very high speed operation mode while maintaining RS-232 output levels. SSOP SOP Description The ST3237E is a 3 V to 5.5 V powered EIA/TIA232 and V.28/V.24 communication interfaces high data-rate capability and enhanced electrostatic discharge (ESD) protection at 8 kV using IEC1000-4-2 contact discharge and 15 kV using Human Body Model (HBM). The other pins are protected with standard ESD protection at 2 kV using HBM method. The ST3237C 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 3 V to 5.5 V supply using a dual charge pump. The device is guaranteed to run at data rates of 250 kbps in the normal Table 1. Device summary Temperature range -40 to 85 C -40 to 85C Package Order code ST3237EBDR ST3237EBPR November 2007 Packaging 1000 parts per reel 1350 parts per reel 1/18 www.st.com 18 SO-28 (tape and reel) SSOP28 (tape and reel) Rev 7 Contents ST3237EB Contents 1 2 3 4 5 6 7 8 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 ST3237EB Pin configuration 1 Figure 1. Pin configuration Pin connection Table 2. Pin description Symbol C2+ GND C2VT1OUT T2OUT T3OUT R1IN R2IN T4OUT R3IN T5OUT EN SHDN VHSCI R1OUTB T5IN R3OUT Name and function Positive Terminal of Inverting Charge Pump Capacitor Ground Negative terminal of inverting charge pump capacitor 5.5V generated by the charge pump First transmitter output voltage Second transmitter output voltage Third transmitter output voltage First receiver input voltage Second receiver input voltage Fourth transmitter output voltage Third receiver input voltage Fifth transmitter output voltage Receiver enable, active low Shutdown control, active low Very high speed control input. Connect to GND for normal operation; connect to VCC for 1 Mbps transmission rates. Non inverting complementary receiver output. Always active. Fifth transmitter input voltage Third receiver output voltage Pin n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 3/18 Pin configuration Table 2. Pin description (continued) Symbol T4IN R2OUT R1OUT T3IN T2IN T1N C1VCC V+ C1+ Name and function Fourth transmitter input voltage Second receiver output voltage First receiver output voltage Third transmitter input voltage Second transmitter input voltage First transmitter input voltage Negative terminal of voltage- charge pump capacitor Supply voltage -5.5V generated by the charge pump Positive terminal of voltage- charge pump capacitor ST3237EB Pin n 19 20 21 22 23 24 25 26 27 28 4/18 ST3237EB Absolute maximum ratings 2 Table 3. Symbol VCC V+ VV+ +|V-| TIN SHDN, EN VHSCI RIN TOUT ROUT, ROUTB tSHORT Tstg Absolute maximum ratings Absolute maximum ratings Parameter Supply voltage Doubled voltage terminal Inverted voltage terminal Value -0.3 to 6 -0.3 to 7 0.3 to -7 13 Transmitter input voltage range -0.3 to 6 -0.3 to 6 Very high speed control input Receiver input voltage range Transmitter output voltage range Receiver output voltage range Short circuit duration on TOUT (one at a time) Storage temperature range -0.3 to (VCC +0.3) 25 13.2 -0.3 to (VCC + 0.3) Continuous -65 to 150 C Unit V V V V V V V V V V Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V. Shutdown and enable control truth table EN 0 1 0 1 T-OUT High Z High Z Active Active R-OUT Active High Z Active High Z R-OUTB Active Active Active Active Table 4. SHDN 0 0 1 1 Figure 2. Symbol ESD ESD ESD performance: transmitter outputs, receiver inputs Parameter ESD protection voltage ESD protection voltage Test conditions Human body model IEC-1000-4-2 contact discharge Min. 15 8 Typ. Max. Unit kV kV 5/18 Electrical characteristics ST3237EB 3 Table 5. Symbol ISUPPLY ISHDN Electrical characteristics Electrical characteristics (C1 - C4 = 0.1 F, VCC = 3 V to 5.5 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Test conditions Min. Typ. 0.3 1 Max. 1 5 Unit mA A VCC power supply current SHDN=VCC, No Load Shutdown supply current SHDN=GND, VT_IN=GND or VCC Table 6. Symbol VTIL VTIH IIL VHYS Logic input (C1 - C4 = 0.1 F, VCC = 3 V to 5.5 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Input logic threshold low (1) Test conditions T-IN, VHSCI, EN, SHDN VCC = 3.3V VCC = 5V Min. Typ. Max. 0.8 Unit V 2 V 2.4 1.0 0.25 A V Input logic threshold high Input leakage current Transmitter input hysteresis T-IN, VHSCI, EN, SHDN T-IN, VHSCI, EN, SHDN 1. Transmitter input hysteresis is typically 250 mV Table 7. Symbol VTOUT RTOUT ISC ITOL Transmitter (C1 - C4 = 0.1 F tested at 3.3 V 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Output voltage swing Transmitter output resistance Output short circuit current Output leakage current VCC = 0V or 3.3V to 5.5V VOUT = 12V Transmitters disable Test conditions All transmitter outputs are loaded with 3K to GND VCC = 0V, VOUT = 2V Min. 5 300 Typ. 5.4 10M 60 25 Max. Unit V mA A 6/18 ST3237EB Electrical characteristics Table 8. Symbol IOL VOL VOH VRIN VRIL Receiver (C1 - C4 = 0.1 F tested at 3.3 V 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25C) Parameter Output leakage current Output voltage low Output voltage high Receiver input voltage operating range RS-232 input threshold low RS-232 input threshold high Input hysteresis Input resistance TA = 25C 3 TA = 25C, VCC = 3.3V TA = 25C, VCC = 5V TA = 25C, VCC = 3.3V TA = 25C, VCC = 5V Test conditions Receiver disabled, EN = VCC IOUT = 1mA IOUT = -1mA VCC-0.6 -25 0.6 0.8 1.1 V 1.5 1.5 1.2 0.3 5 7 2.4 V 2.4 V K VCC-0.1 25 Min. Typ. 0.05 Max. 10 0.4 Unit A V V V VRIH VRIHYS RRIN Table 9. Symbol Timing characteristics (C1 - C4 = 0.1 F tested at 3.3 V 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Test conditions RL = 3K CL= 1000pF , one transmitter switching, VHSCI=GND , RL = 3K CL= 250pF one transmitter switching, VHSCI=VCC VCC= 3 to 4.5V , RL = 3K CL= 1000pF one transmitter switching, VHSCI=VCC VCC= 4.5 to 5.5V Min. 250 Typ. Max. Unit Kbps DR Maximum data rate 1000 Kbps 1000 Kbps tPHLR tPLHR tPHLR tPLHR Propagation delay input to output Propagation delay input to output RIN to ROUT, CL = 150pF , RL = 3k CL = 1000pF, VHSCI=VCC VHSCI=GND |tPHL - tTLH|, VHSCI=GND |tPHL - tTLH|, VHSCI=VCC |tPHL - tTLH| 0.15 s ns ns ns ns ns ns ns 400 1000 300 50 100 50 120 tT_SKEW Transmitter skew tR_SKEW Receiver skew tOER tODR Receiver output enable time Normal operation Receiver output disable time Normal operation TA = 25C RL = 3 to 7K, VCC = 3.3V measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF, VHSCI=GND CL = 150pF to 1000pF, VHSCI=VCC CL = 150pF to 2500pF, VHSCI=GND SRT Transition slew rate 6 24 4 30 150 30 V/s V/s V/s Note: Transmitter skew is measured at the transmitter zero cross points 7/18 Application ST3237EB 4 Figure 3. Application Application circuits Table 10. VCC Capacitance value (F) C1 0.22 0.1 0.047 0.22 C2 0.22 0.1 0.33 0.1 C3 0.22 0.1 0.33 0.1 C4 0.22 0.1 0.33 0.1 Cbypass 0.1 0.1 0.1 0.1 3.0 to 3.6 3.1 to 3.6 4.5 to 5.5 3.0 to 5.5 8/18 ST3237EB Typical performance characteristics 5 Figure 4. Typical performance characteristics (unless otherwise specified TJ = 25C) Low level receiver output current Figure 5. High level receiver output current Figure 6. ESD protection Note: The high ESD protected pins are the I/O RS232 line, transmitter out and receiver in. The other pins guarantee 2 kV HBM ESD protection versus ground by means of diodes. 9/18 Application note ST3237EB 6 Application note This application note describes the procedure for determining the susceptibility and the test method to verify ST ESD advanced protection on RS-232 or RS485 I/O device. Static electricity is defined as an electrical charge caused by an imbalance of electrons on the surface of a material. This imbalance of electrons produces an electric field that can be measured and that can influence other objects at a distance. Electrostatic discharge is defined as the transfer of charge between bodies at different electrical potentials. Electrostatic discharge (ESD) can change the electrical characteristics of a semiconductor device, degrading or destroying it. Any input or output port (I/O) allows access communication with other pieces of equipment by external connectors. These connectors are directly linked by the I/O pins of RS-232 or RS485 interface. ST provides the E-series by advanced high ESD protection structure. The protection functionality is tested in two different conditions: The first model is used to simulate the HUMAN BODY MODEL (HBM) event. A similar discharge can occur from a charged conductive object, such as a metallic tool or fixture. The model used to characterize this event is known as the machine model. A human body model circuit and waveform is presented in figures below. Figure 7. Human body model circuit Figure 8. Human body model current waveform 10/18 ST3237EB Application note The second model is IEC 1000-4-2 and is used to simulate the reaction of the device on equipment when subjected to electrostatic discharges, which may occur from personnel to objects near vital instrumentation. Direct (Contact) and indirect (Air Gap) applications of discharges to the equipment under test (EUT) are possible. Test characteristics are shown in circuit, waveform and table below. Figure 9. IEC 1000-4-2 circuit Figure 10. IEC 1000-4-2 current waveform Table 11. Level 1 2 3 4 Characteristics of the ESD generator Indicated voltage 2 kV 4 kV 6 kV 8 kV First peak current of discharge ( 10%) 7.5 A 15 A 22.5 A 30 A Rise time with discharge Current at 30 ns Current at 60 ns switch ( 30%) ( 30%) 0.7 to 1ns 0.7 to 1ns 0.7 to 1ns 0.7 to 1ns 4A 8A 12 A 16 A 2A 4A 6A 8A 11/18 Package mechanical data ST3237EB 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 12/18 ST3237EB Package mechanical data SO-28 mechanical data mm. Dim. Min. A a1 b b1 C c1 D E e e3 F L S 7.40 0.50 17.70 10.00 1.27 16.51 7.60 1.27 8 (max.) 0.291 0.020 18.10 10.65 0.1 0.35 0.23 0.5 45 (typ.) 0.697 0.393 0.050 0.650 0.300 0.050 0.713 0.419 Typ. Max. 2.65 0.3 0.49 0.32 0.004 0.014 0.009 0.020 Min. Typ. Max. 0.104 0.012 0.019 0.012 inch. 0016023 13/18 Package mechanical data ST3237EB SSOP28 mechanical data mm. Dim. Min. A A1 A2 b c D E E1 e K L 0 0.55 0.75 0.050 1.65 0.22 0.09 9.9 7.4 5 10.2 7.8 5.3 0.65 BSC 10 0.95 0 0.022 0.030 1.75 1.85 0.38 0.25 10.5 8.2 5.6 Typ. Max. 2 0.002 0.065 0.009 0.004 0.390 0.291 0.197 0.402 0.307 0.209 0.0256 BSC 10 0.037 0.069 0.073 0.015 0.010 0.413 0.323 0.220 Min. Typ. Max. 0.079 inch. 14/18 ST3237EB Package mechanical data Tape & reel SO-28 mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 10.8 18.2 2.9 3.9 11.9 12.8 20.2 60 30.4 11.0 18.4 3.1 4.1 12.1 0.425 0.716 0.114 0.153 0.468 Typ. Max. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.724 0.122 0.161 0.476 Min. Typ. Max. 12.992 0.519 inch. 15/18 Package mechanical data ST3237EB Tape & reel SSOP28 mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 8.4 10.7 2.9 3.9 11.9 12.8 20.2 60 22.4 8.6 10.9 3.1 4.1 12.1 0.331 0.421 0.114 0.153 0.468 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.339 0.429 0.122 0.161 0.476 Min. Typ. Max. 12.992 0.519 inch. 16/18 ST3237EB Revision history 8 Table 12. Date Revision history Document revision history Revision 5 6 7 TSSOP has been removed. Order codes updated. Added Table 1. Changes 21-Mar-2005 24-Mar-2006 13-Nov-2007 17/18 ST3237EB Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 18/18 |
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