8785

ST3237E ±15KV ESD-PROTECTED, 1µA, 3 TO 5.5V, 250KBPS, RS-232 TRANSCEIVER WITH STAND-BY s s s s s s s s 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 SSOP SOP TSSOP 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 ORDERING CODES Type ST3237ECD ST3237EBD ST3237ECDR ST3237EBDR ST3237ECPR ST3237EBPR ST3237ECTR (*) ST3237EBTR Temperature Range 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 Package 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. Comments 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 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) January 2003 1/13 ST3237E PIN DESCRIPTION PlN N° 1 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 27 28 SYMBOL C2+ GND C2VT1OUT T2OUT T3OUT R1IN R2IN T4OUT R3IN T5OUT EN SHDN VHSCI R1OUTB T5IN R3OUT T4IN R2OUT R1OUT T3IN T2IN T1N C1VCC V+ C1 + 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. Connected to GND for normal operation; connected to VCC for 1Mbps transmission rates. Non Inverting Complementary Receiver Output. Always Active. Fifth Transmitter Input Voltage Third Receiver Output Voltage 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-Doubler Charge Pump Capacitor Supply Voltage 5.5V Generated by the Charge Pump Positive Terminal of Voltage-Doubler Charge Pump Capacitor 2/13 ST3237E PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Symbol VCC V+ VV+ +|V-| TIN SHDN, EN VHSCI RIN TOUT tSHORT Tstg Very High Speed Control Input Receiver Input Voltage Range Transmitter Output Voltage Range Short Circuit Duration on TOUT (one at a time) Storage Temperature Range Supply Voltage Doubled Voltage Terminal Inverted Voltage Terminal Transmitter Input Voltage Range Parameter Value -0.3 to 6 -0.3 to 7 0.3 to -7 13 -0.3 to 6 -0.3 to 6 -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 ROUT, ROUTB Receiver Output Voltage Range 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 0 0 1 1 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 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. ±15 ±8 Typ. Max. 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 ISHDN Parameter SHDN=VCC Shutdown Supply Current Test Conditions No Load SHDN=GND VT_IN=GND or VCC Min. Typ. 0.3 1 Max. 1 5 Unit mA µA ISUPPLY VCC Power Supply Current 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 VTIL VTIH IIL VHYS Parameter Input Logic Threshold Low (Note 1) Input Logic Threshold High Input Leakage Current Transmitter Input Hysteresis Test Conditions T-IN, VHSCI, EN, SHDN T-IN, VHSCI, EN, SHDN T-IN, VHSCI, EN, SHDN 0.25 VCC = 3.3V VCC = 5V 2 2.4 ± 1.0 µA V Min. Typ. Max. 0.8 Unit V 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 VTOUT RTOUT ISC ITOL Parameter Output Voltage Swing Transmitter Output Resistance Output Short Circuit Current Output Leakage Current Test Conditions All Transmitter outputs are loaded with 3KΩ to GND VCC = 0V VOUT = ± 2V Min. ±5 300 Typ. ± 5.4 10M ± 60 VCC = 0V or 3.3V to 5.5V VOUT = ± 12V Transmitters Disable ± 25 Max. Unit V Ω mA µA 4/13 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 IOL VOL VOH VRIN VRIL VRIH 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 IOUT = 1mA IOUT = -1mA VCC-0. VCC-0.1 6 -25 VCC = 3.3V VCC = 5V VCC = 3.3V VCC = 5V 3 0.6 0.8 1.1 1.5 1.5 1.2 0.3 TA = 25°C 5 7 2.4 2.4 V KΩ V Test Conditions Receiver Disabled EN=VCC Min. Typ. ± 0.05 Max. ± 10 0.4 Unit µA V V 25 V V TA = 25°C TA = 25°C TA = 25°C TA = 25°C VRIHYS Input Hysteresis RRIN Input Resistance 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 tPHLR tPLHR Propagation Delay Input to Output Propagation Delay Input to Output RIN to ROUT RL = 3kΩ VHSCI=VCC VHSCI=GND |tPHL - tTLH| |tPHL - tTLH| tR_SKEW Receiver Skew tOER tODR SRT Receiver Output Enable Time Receiver Output Disable Time Transition Slew Rate |tPHL - tTLH| Normal Operation Normal Operation 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 CL = 150pF CL = 1000pF 400 1000 VHSCI=GND VHSCI=VCC 300 50 100 50 120 ns ns ns ns ns ns ns Min. 250 1000 Typ. Max. Unit Kbps Kbps 1000 Kbps 0.15 µs tT_SKEW Transmitter Skew 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 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 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. 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 10/13 ST3237E 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 11/13 ST3237E TSSOP28 MECHANICAL DATA mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0˚ 0.45 0.60 0.05 0.8 0.19 0.09 9.6 6.2 4.3 9.7 6.4 4.4 0.65 BSC 8˚ 0.75 0˚ 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 9.8 6.6 4.48 0.002 0.031 0.007 0.004 0.378 0.244 0.169 0.382 0.252 0.173 0.0256 BSC 8˚ 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.386 0.260 0.176 inch 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