ST3237E ±15KV ESD-PROTECTED, 1µA, 3 TO 5.5V, 250KBPS, RS-232 TRANSCEIVER WITH STAND-BY ■ ■ ■ ■ ■ ■ ■ ■ EDS PROTECTION FOR RS-232 I/O PINS: ±15KV HUMAN BODY MODEL ±8KV IEC 1000-4-2 CONTACT DISCHARGE 1µA LOW POWER SHUTDOWN WITH RECEIVERS ACTIVE GUARENTEED DATA RATE 250Kbps (Normal Operation) 1Mbps (Very High Speed Operation) GUARANTEED SLEW RATE RANGE 6V/µs (Normal Operation) 24V/µs (Very High Speed Operation) 0.1µF EXTERNAL CAPACITORS FLOW-THROUGH PINOUT AVAILABLE IN SO-28, SSOP-28 AND TSSOP28 LOW SUPPLY CURRENT 300µA SOP SSOP DESCRIPTION The ST3237E is a 3V to 5.5V powered EIA/ TIA-232 and V.28/V.24 communication interfaces high data-rate capability and enhanced electrostatic discharge (ESD) protection at ±8KV using IEC1000-4-2 contact discharge and ±15kV using Human Body Model (HBM). The other pins are protected with standard ESD protection at ±2kV 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 TSSOP 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 operation mode and 1Mbps in the very high speed operation mode while maintaining RS-232 output levels. ORDERING CODES Type Temperature Range Package Comments ST3237ECD ST3237EBD ST3237ECDR ST3237EBDR ST3237ECPR ST3237EBPR ST3237ECTR (*) ST3237EBTR 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C SO-28 (Tube) SO-28 (Tube) SO-28 (Tape & Reel) SO-28 (Tape & Reel) SSOP-28 (Tape & Reel) SSOP-28 (Tape & Reel) TSSOP28 (Tape & Reel) TSSOP28 (Tape & Reel) 27parts per tube / 12tube per box 27parts per tube / 12tube per box 1000 parts per reel 1000 parts per reel 1350 parts per reel 1350 parts per reel 2500 parts per reel 2500 parts per reel January 2003 1/13 ST3237E PIN DESCRIPTION PlN N° NAME AND FUNCTION 1 C2+ Positive Terminal of Inverting Charge Pump Capacitor 2 GND C2- Ground Negative Terminal of Inverting Charge Pump Capacitor 3 4 5 VT1OUT -5.5V Generated by the Charge Pump First Transmitter Output Voltage 6 T2OUT Second Transmitter Output Voltage 7 T3OUT Third Transmitter Output Voltage 8 R1IN First Receiver Input Voltage 9 R2IN Second Receiver Input Voltage 10 T4OUT 11 R3IN 12 T5OUT Fifth Transmitter Output Voltage 13 14 15 EN SHDN VHSCI 16 R1OUTB Receiver Enable, Active Low Shutdown Control, Active Low Very High Speed Control Input. Connected to GND for normal operation; connected to VCC for 1Mbps transmission rates. Non Inverting Complementary Receiver Output. Always Active. Fourth Transmitter Output Voltage Third Receiver Input Voltage 17 T5IN Fifth Transmitter Input Voltage 18 R3OUT Third Receiver Output Voltage 19 T4IN Fourth Transmitter Input Voltage 20 R2OUT Second Receiver Output Voltage 21 R1OUT First Receiver Output Voltage 22 T3IN Third Transmitter Input Voltage 23 T2IN Second Transmitter Input Voltage 24 T1N First Transmitter Input Voltage 25 C1- Negative Terminal of Voltage-Doubler Charge Pump Capacitor 26 VCC Supply Voltage 27 V+ C1 + 5.5V Generated by the Charge Pump Positive Terminal of Voltage-Doubler Charge Pump Capacitor 28 2/13 SYMBOL ST3237E PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Symbol VCC V+ VV+ +|V-| TIN Parameter Value Unit Supply Voltage -0.3 to 6 V Doubled Voltage Terminal Inverted Voltage Terminal -0.3 to 7 0.3 to -7 13 V V V Transmitter Input Voltage Range -0.3 to 6 V -0.3 to 6 -0.3 to (VCC +0.3) V SHDN, EN VHSCI Very High Speed Control Input RIN Receiver Input Voltage Range ± 25 V ± 13.2 V -0.3 to (VCC + 0.3) V Transmitter Output Voltage Range TOUT ROUT, ROUTB Receiver Output Voltage Range tSHORT Tstg V Short Circuit Duration on TOUT (one at a time) Continuous Storage Temperature Range -65 to 150 °C 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 +7V, but their absolute addition can not exceed 13 V. SHUTDOWN AND ENABLE CONTROL TRUTH TABLE SHDN EN T-OUT R-OUT R-OUTB 0 0 1 1 0 1 0 1 High Z High Z Active Active Active High Z Active High Z Active Active Active Active 3/13 ST3237E ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS Symbol ESD ESD Parameter ESD Protection Voltage ESD Protection Voltage Test Conditions Human Body Model IEC-1000-4-2 Contact Discharge Min. Typ. Max. ±15 ±8 Unit kV kV ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol Parameter ISUPPLY VCC Power Supply Current ISHDN Shutdown Supply Current Test Conditions SHDN=VCC Min. No Load SHDN=GND VT_IN=GND or VCC Typ. Max. Unit 0.3 1 mA 1 5 µA Typ. Max. Unit 0.8 V LOGIC INPUT ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol Parameter VTIL Input Logic Threshold Low (Note 1) Input Logic Threshold High T-IN, VHSCI, EN, SHDN Input Leakage Current T-IN, VHSCI, EN, SHDN VTIH Test Conditions T-IN, VHSCI, EN, SHDN VCC = 3.3V VCC = 5V IIL VHYS Min. 2 V 2.4 ± 1.0 Transmitter Input Hysteresis 0.25 µA V Note 1: Transmitter input hysteresis is typically 250mV TRANSMITTER ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol Parameter VTOUT Output Voltage Swing RTOUT ISC Transmitter Output Resistance Output Short Circuit Current ITOL Output Leakage Current 4/13 Test Conditions All Transmitter outputs are loaded with 3KΩ to GND VCC = 0V VOUT = ± 2V VCC = 0V or 3.3V to 5.5V VOUT = ± 12V Transmitters Disable Min. Typ. Max. ±5 ± 5.4 V 300 10M Ω ± 60 mA ± 25 Unit µA ST3237E RECEIVER ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol Parameter Test Conditions IOL Output Leakage Current Receiver Disabled VOL Output Voltage Low IOUT = 1mA VOH Output Voltage High IOUT = -1mA VRIN Receiver Input Voltage Operating Range RS-232 Input Threshold Low VRIL VRIH RS-232 Input Threshold High Min. EN=VCC Input Resistance Max. Unit ± 0.05 ± 10 µA 0.4 V VCC-0. VCC-0.1 6 -25 V 25 TA = 25°C VCC = 3.3V 0.6 1.1 TA = 25°C VCC = 5V 0.8 1.5 TA = 25°C VCC = 3.3V 1.5 2.4 TA = 25°C VCC = 5V 1.2 2.4 VRIHYS Input Hysteresis RRIN Typ. V 0.3 TA = 25°C 3 5 V V V 7 KΩ TIMING CHARACTERISTICS (C1 - C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol DR Parameter Maximum Data Rate Test Conditions RL = 3KΩ CL= 1000pF one transmitter switching VHSCI=GND CL= 250pF RL = 3KΩ one transmitter switching VHSCI=VCC VCC= 3 to 4.5V CL= 1000pF RL = 3KΩ one transmitter switching VHSCI=VCC VCC= 4.5 to 5.5V tPHLR tPLHR Propagation Delay Input to Output RIN to ROUT CL = 150pF tPHLR tPLHR Propagation Delay Input to Output RL = 3kΩ VHSCI=VCC VHSCI=GND |tPHL - tTLH| CL = 1000pF |tPHL - tTLH| VHSCI=VCC tT_SKEW Transmitter Skew tR_SKEW Receiver Skew tOER tODR SRT Receiver Output Enable Time Receiver Output Disable Time Transition Slew Rate Min. Typ. Max. Unit 250 Kbps 1000 Kbps 1000 Kbps VHSCI=GND 0.15 µs 400 1000 ns ns 300 ns 50 ns |tPHL - tTLH| 100 ns Normal Operation 50 ns Normal Operation 120 ns TA = 25°C RL = 3 to 7KΩ 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 6 24 4 30 150 30 V/µs V/µs V/µs Transmitter Skew is measured at the transmitter zero cross points 5/13 ST3237E APPLICATION CIRCUITS CAPACITANCE VALUE (µF) VCC 3.0 to 3.1 to 4.5 to 3.0 to 6/13 3.6 3.6 5.5 5.5 C1 C2 C3 C4 Cbypass 0.22 0.1 0.047 0.22 0.22 0.1 0.33 0.1 0.22 0.1 0.33 0.1 0.22 0.1 0.33 0.1 0.1 0.1 0.1 0.1 ST3237E TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C) Figure 1 : LOW Level Receiver Output Current Figure 2 : HIGH Level Receiver Output Current ESD PROTECTION Note: The High ESD protected pins are the I/O RS232 line, transmitter out and receiver in. The other pins guarantee ± 2KV HBM ESD protection versus ground by means of diodes. 7/13 ST3237E 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. HUMAN BODY MODEL CIRCUIT HUMAN BODY MODEL CURRENT WAVEFORM 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. 8/13 ST3237E IEC 1000-4-2 CIRCUIT IEC 1000-4-2 CURRENT WAVEFORM CHARACTERISTICS OF THE ESD GENERATOR Level 1 2 3 4 Indicated Voltage 2 4 6 8 KV KV KV KV First Peak Current of Rise Time With Discharge Current at 30 ns Current at 60 ns Discharge (± 10%) (± 30%) (± 30%) Switch 7.5 A 15 A 22.5 A 30 A 0.7 to 0.7 to 0.7 to 0.7 to 1ns 1ns 1ns 1ns 4A 8A 12 A 16 A 2A 4A 6A 8A 9/13 ST3237E SO-28 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 2.65 MAX. 0.104 a1 0.1 0.3 0.004 0.012 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 C 0.5 0.020 c1 45˚ (typ.) D 17.70 18.10 0.697 0.713 E 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 16.51 0.650 F 7.40 7.60 0.291 0.300 L 0.50 1.27 0.020 0.050 S 8 ˚ (max.) 0016023 10/13 ST3237E SSOP28 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 2 A1 0.050 A2 1.65 b MAX. 0.079 0.002 1.85 0.065 0.22 0.38 0.009 0.015 c 0.09 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 1.75 0.65 BSC K 0˚ L 0.55 0.75 0.069 0.073 0.0256 BSC 10˚ 0˚ 0.95 0.022 10˚ 0.030 0.037 11/13 ST3237E TSSOP28 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. MAX. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 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 1 0.65 BSC K 0˚ L 0.45 0.60 0.0256 BSC 8˚ 0˚ 0.75 0.018 8˚ 0.024 0.030 0128292B 12/13 ST3237E 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 in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2003 STMicroelectronics - Printed in Italy - All 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 13/13