8785

8785 STMICROELECTRONICS | Alldatasheet

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Technical content

■ 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 300 µA

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 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 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box ST3237EBD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box ST3237ECDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel ST3237EBDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel ST3237ECPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel ST3237EBPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel ST3237ECTR (*) 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel ST3237EBTR -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel ST3237E ±15KV ESD-PROTECTED, 1 µA, 3 TO 5.5V, 250KBPS, RS-232 TRANSCEIVER WITH STAND-BY SSOP SOP TSSOP

PlN N° SYMBOL NAME AND FUNCTION

1 C 2+ Positive Terminal of Inverting Charge Pump Capacitor

2 GND Ground

3 C 2- Negative Terminal of Inverting Charge Pump Capacitor

4 V- -5.5V Generated by the Charge Pump

5 T1OUT First Transmitter Output Voltage

6 T2OUT Second Transmitter Output Voltage

7 T3OUT Third Transmitter Output Voltage

8 R1 IN First Receiver Input Voltage

9 R2 IN Second Receiver Input Voltage

10 T4OUT Fourth Transmitter Output Voltage

11 R3 IN Third Receiver Input Voltage

12 T5OUT Fifth Transmitter Output Voltage

13 EN Receiver Enable, Active Low

14 SHDN Shutdown Control, Active Low

15 VHSCI Very High Speed Control Input. Connected to GND for normal operation; connected to VCC for 1Mbps transmission rates. 16 R1 OUTB Non Inverting Complementary Receiver Output. Always Active.

17 T5IN Fifth Transmitter Input Voltage

18 R3 OUT Third Receiver Output Voltage

19 T4IN Fourth Transmitter Input Voltage

20 R2 OUT Second Receiver Output Voltage

21 R1 OUT First Receiver Output Voltage

22 T3IN Third Transmitter Input Voltage

23 T2IN Second Transmitter Input Voltage

24 T1N First Transmitter Input Voltage

25 C 1- Negative Terminal of Voltage-Doubler Charge Pump Capacitor

26 VCC Supply Voltage

27 V+ 5.5V Generated by the Charge Pump

28 C 1+ Positive Terminal of Voltage-Doubler Charge Pump Capacitor

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 Symbol Parameter Value Unit VCC Supply Voltage -0.3 to 6 V V+ Doubled Voltage Terminal -0.3 to 7 V V- Inverted Voltage Terminal 0.3 to -7 V V+ +|V-| 13 V TIN Transmitter Input Voltage Range -0.3 to 6 V SHDN ,E N -0.3 to 6 V VHSCI Very High Speed Control Input -0.3 to (V CC +0.3) V R IN Receiver Input Voltage Range ± 25 V TOUT Transmitter Output Voltage Range ± 13.2 V R OUT ,R OUTB Receiver Output Voltage Range -0.3 to (V CC + 0.3) V tSHORT Short Circuit Duration on TOUT (one at a time) Continuous Tstg Storage Temperature Range -65 to 150 °C SHDN EN T-OUT R-OUT R-OUTB 0 0 High Z Active Active 0 1 High Z High Z Active 1 0 Active Active Active 1 1 Active High Z Active

ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS

ELECTRICAL CHARACTERISTICS

(C1 -C 4 =0 . 1µF, VCC =3 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) LOGIC INPUT ELECTRICAL CHARACTERISTICS (C1 -C 4 =0 . 1µF, VCC =3 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Note 1: Transmitter input hysteresis is typically 250mV TRANSMITTER ELECTRICAL CHARACTERISTICS 1 -C 4 =0 . 1µF tested at 3.3V±10%, VCC =3 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Symbol Parameter Test Conditions Min. Typ. Max. Unit ESD ESD Protection Voltage Human Body Model ±15 kV ESD ESD Protection Voltage IEC-1000-4-2 Contact Discharge ±8k V Symbol Parameter Test Conditions Min. Typ. Max. Unit ISUPPLY VCC Power Supply Current SHDN=V CC No Load 0.3 1 mA ISHDN Shutdown Supply Current SHDN =GND V T_IN=GND or VCC 15 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit VTIL Input Logic Threshold Low (Note 1) T-IN, VHSCI, EN,S H D N 0.8 V VTIH Input Logic Threshold High T-IN, VHSCI, EN,S H D N VCC = 3.3V 2 V VCC =5 V 2 . 4 IIL Input Leakage Current T-IN, VHSCI, EN,S H D N ± 1.0 µA VHYS Transmitter Input Hysteresis 0.25 V Symbol Parameter Test Conditions Min. Typ. Max. Unit VTOUT Output Voltage Swing All Transmitter outputs are loaded with 3KΩ to GND ± 5 ± 5.4 V RTOUT Transmitter Output Resistance VCC =0 V V OUT = ± 2V 300 10M Ω ISC Output Short Circuit Current ± 60 mA ITOL Output Leakage Current V CC = 0V or 3.3V to 5.5V VOUT = ± 12V Transmitters Disable ± 25 µA

RECEIVER ELECTRICAL CHARACTERISTICS (C1 -C 4 =0 . 1µF tested at 3.3V±10%, VCC =3 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) TIMING CHARACTERISTICS (C1 -C 4 =0 . 1µF tested at 3.3V±10%, VCC =3 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Transmitter Skew is measured at the transmitter zero cross points Symbol Parameter Test Conditions Min. Typ. Max. Unit IOL Output Leakage Current Receiver Disabled EN =VCC ± 0.05 ± 10 µA VOL Output Voltage Low I OUT = 1mA 0.4 V VOH Output Voltage High I OUT = -1mA V CC -0. VCC -0.1 V VRIN Receiver Input Voltage Operating Range -25 25 V VRIL RS-232 Input Threshold Low TA = 25°C V CC = 3.3V 0.6 1.1 V TA = 25°C V CC = 5V 0.8 1.5 VRIH RS-232 Input Threshold High TA = 25°C V CC = 3.3V 1.5 2.4 V TA = 25°C V CC = 5V 1.2 2.4 VRIHYS Input Hysteresis 0.3 V R RIN Input Resistance T A = 25°C 3 5 7 K Ω Symbol Parameter Test Conditions Min. Typ. Max. Unit D R Maximum Data Rate R L =3 KΩ C L= 1000pF one transmitter switching VHSCI=GND

250 Kbps

R L =3 KΩ C L= 250pF one transmitter switching VHSCI=VCC VCC = 3 to 4.5V

1000 Kbps

R L =3 KΩ C L= 1000pF one transmitter switching VHSCI=VCC VCC = 4.5 to 5.5V Propagation Delay Input to Output R IN to ROUT C L = 150pF 0.15 µs tPHLR tPLHR Propagation Delay Input to Output R L =3 kΩ C L = 1000pF VHSCI=V CC VHSCI=GND 400 1000 ns ns tT_SKEW Transmitter Skew |t PHL -tTLH | VHSCI=GND 300 ns |tPHL -tTLH | VHSCI=V CC 50 ns tR_SKEW Receiver Skew |t PHL -tTLH | 100 ns tOER Receiver Output Enable Time Normal Operation 50 ns tODR Receiver Output Disable Time Normal Operation 120 ns SRT Transition Slew Rate T A = 25°C R L = 3 to 7KΩ VCC = 3.3V measured from +3V to -3V or -3V to +3V C L = 150pF to 1000pF VHSCI=GND C L = 150pF to 1000pF VHSCI=V CC C L = 150pF to 2500pF VHSCI=GND 150 V/µs V/µs V/µs

CAPACITANCE VALUE ( µF) VCC C1 C2 C3 C4 Cbypass

TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj=2 5 ° 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 pro- tection versus ground by means of diodes.

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 HUMANBODYMODEL CURRENTWAVEFORM 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.

IEC 1000-4-2 CURRENT WAVEFORM CHARACTERISTICS OF THE ESD GENERATOR Level Indicated Voltage First Peak Current of Discharge (± 10%) Rise Time With Discharge Switch Current at 30 ns (± 30%) Current at 60 ns (± 30%) 1 2 KV 7.5 A 0.7 to 1ns 4 A 2 A 2 4 KV 15 A 0.7 to 1ns 8 A 4 A 3 6 KV 22.5 A 0.7 to 1ns 12 A 6 A 4 8 KV 30 A 0.7 to 1ns 16 A 8 A

DIM. mm. inch A 2.65 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 ˚ (max.) SO-28 MECHANICAL DATA 0016023

DIM. mm. inch A 2 0.079 A1 0.050 0.002 b 0.22 0.38 0.009 0.015 c 0.09 0.25 0.004 0.010 e 0.65 BSC 0.0256 BSC K 0˚ 10˚ 0˚ 10˚ SSOP28 MECHANICAL DATA

DIM. mm. inch A 1.2 0.047 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 e 0.65 BSC 0.0256 BSC K0 ˚ 8 ˚0 ˚ 8 ˚ TSSOP28 MECHANICAL DATA 0128292B

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