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 AND SSOP-28 LOW SUPPLY CURRENT 300µA 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 SSOP SOP ±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 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. Table 1: Order Codes Type Temperature Range Package Comments ST3237ECD ST3237EBD ST3237ECDR ST3237EBDR ST3237ECPR ST3237EBPR 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) 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 March 2005 Rev. 5 1/15 ST3237E Table 2: Pin Description PlN N° SYMBOL 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 2/15 NAME AND FUNCTION ST3237E Figure 1: Pin Configuration Table 3: Absolute Maximum Ratings Symbol VCC V+ VV+ +|V-| TIN Parameter Value 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 ROUT, ROUTB Receiver Output Voltage Range ± 25 V V -0.3 to (VCC + 0.3) V Short Circuit Duration on TOUT (one at a time) Storage Temperature Range tSHORT Tstg V ± 13.2 Transmitter Output Voltage Range TOUT Unit Continuous -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. Table 4: 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 Table 5: 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. ±15 ±8 Typ. Max. Unit kV kV 3/15 ST3237E Table 6: 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=GNDVT_IN=GND or VCC Typ. Max. Unit 0.3 1 mA 1 5 µA Typ. Max. Unit 0.8 V Table 7: 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 VTIH Test Conditions Min. T-IN, VHSCI, EN, SHDN T-IN, VHSCI, EN, SHDN VCC = 3.3V VCC = 5V IIL VHYS Input Leakage Current 2 V 2.4 ± 1.0 T-IN, VHSCI, EN, SHDN Transmitter Input Hysteresis 0.25 µA V Note 1: Transmitter input hysteresis is typically 250mV Table 8: 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 VTOUT RTOUT Parameter Test Conditions Output Voltage Swing All Transmitter outputs are loaded with 3KΩ to GND Transmitter Output Resistance VCC = 0V VOUT = ± 2V ISC Output Short Circuit Current ITOL Output Leakage Current Min. Typ. Max. ±5 ± 5.4 V 300 10M Ω ± 60 VCC = 0V or 3.3V to 5.5V VOUT = ± 12V Transmitters Disable Unit mA ± 25 µA Table 9: 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 4/15 Input Resistance Max. Unit ± 0.05 ± 10 µA 0.4 V VCC-0. VCC-0.1 6 -25 TA = 25°C VCC = 3.3V 0.6 1.1 TA = 25°C VCC = 5V 0.8 1.5 V 25 TA = 25°C VCC = 3.3V 1.5 2.4 1.2 2.4 0.3 TA = 25°C 3 5 V V TA = 25°C VCC = 5V VRIHYS Input Hysteresis RRIN Typ. V V 7 KΩ ST3237E Table 10: 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 RL = 3KΩ CL= 250pF one transmitter switching VHSCI=VCC VCC= 3 to 4.5V RL = 3KΩ CL= 1000pF one transmitter switching VHSCI=VCC VCC= 4.5 to 5.5V Min. Typ. Max. Unit 250 Kbps 1000 Kbps 1000 Kbps 0.15 µs 400 1000 ns ns 300 ns 50 ns 100 ns tPHLR tPLHR Propagation Delay Input to Output RIN to ROUT CL = 150pF tPHLR tPLHR Propagation Delay Input to Output CL = 1000pF tT_SKEW Transmitter Skew RL = 3kΩ VHSCI=VCC VHSCI=GND |tPHL - tTLH| |tPHL - tTLH| VHSCI=VCC tR_SKEW Receiver Skew |tPHL - tTLH| Normal Operation 50 ns Normal Operation 120 ns tOER tODR SRT Receiver Output Enable Time Receiver Output Disable Time Transition Slew Rate VHSCI=GND 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 5/15 ST3237E Figure 2: Application Circuits Table 11: Capacitance Value (µF) VCC 3.0 to 3.1 to 4.5 to 3.0 to 6/15 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 3: LOW Level Receiver Output Current Figure 4: HIGH Level Receiver Output Current Figure 5: 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. 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. 7/15 ST3237E Figure 6: Human Body Model Circuit Figure 7: 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 Figure 8: IEC 1000-4-2 Circuit 8/15 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. ST3237E Figure 9: IEC 1000-4-2 Current Waveform Table 12: 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 9/15 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 10/15 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 11/15 ST3237E Tape & Reel SO-28 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 330 MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 TYP. 0.504 30.4 0.519 1.197 Ao 10.8 11.0 0.425 0.433 Bo 18.2 18.4 0.716 0.724 Ko 2.9 3.1 0.114 0.122 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 12/15 ST3237E Tape & Reel SSOP28 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 330 MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 TYP. 0.504 22.4 0.519 0.882 Ao 8.4 8.6 0.331 0.339 Bo 10.7 10.9 0.421 0.429 Ko 2.9 3.1 0.114 0.122 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 13/15 ST3237E Table 13: Revision History Date Revision 21-Mar-2005 5 14/15 Description of Changes TSSOP has been removed. 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. 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