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ST3237E
15KV ESD-protected, 1A, 3 to 5.5V, 250Kbps RS-232 Transceiver with stand-by
Feature summary
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ESD protection for RS-232 I/O pins - 15KV human body model - 8KV IEC 1000-4-2 contacts discharge 1A low power shutdown with receivers active Guaranteed data rate - 250Kbps (normal operation) - 1Mbps (very high speed operation) Guaranteed slew rate range - 6V/s (normal operation) - 24V/s (very high speed operation) 0.1F external capacitors Flow-through pinout Low supply current 300A Available in SSOP-28 and SO-28 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..
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SSOP
SOP
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Description
The ST3237E is a 3V to 5.5V powered EIA/TIA232 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
Order codes
Part number ST3237EBDR ST3237ECPR ST3237EBPR Temperature range -40 to 85 C 0 to 70 C -40 to 85C Package SO-28 (Tape & Reel) SSOP-28 (Tape & Reel) SSOP-28 (Tape & Reel) Comments 1000 parts per reel 1350 parts per reel 1350 parts per reel
March 2006
Rev 6
1/17
www.st.com 17
Contents
ST3237E
Contents
1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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ST3237E
Pin configuration
1
Figure 1.
Pin configuration
Pin connection
Table 1.
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 1Mbps transmission rates. Non Inverting Complementary Receiver Output. Always Active. Fifth Transmitter Input Voltage Third Receiver Output Voltage
PlN N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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Pin configuration Table 1. Pin description
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
ST3237E
PlN N 19 20 21 22 23 24 25 26 27 28
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ST3237E
Absolute maximum ratings
2
Table 2.
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 +7V, 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 3.
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
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Electrical characteristics
ST3237E
3
Table 4.
Symbol ISUPPLY ISHDN
Electrical characteristics
Electrical characteristics (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Parameter VCC Power Supply Current Test conditions SHDN=VCC, No Load Min. Typ. 0.3 1 Max. 1 5 Unit mA A
Shutdown Supply Current SHDN=GND, V T_IN=GND or VCC
Table 5.
Symbol VTIL
Logic input (C 1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Parameter Input Logic Threshold Low (Note 1) Input Logic Threshold High Input Leakage Current Transmitter Input Hysteresis Test conditions T-IN, VHSCI, EN, SHDN VCC = 3.3V VCC = 5V T-IN, VHSCI, EN, SHDN 0.25 2 V 2.4 1.0 A V Min. Typ. Max. 0.8 Unit V
VTIH IIL VHYS
T-IN, VHSCI, EN, SHDN
Note: Table 6.
Symbol VTOUT RTOUT ISC ITOL
Transmitter input hysteresis is typically 250mV Transmitter (C1 - C4 = 0.1F tested at 3.3V10%, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
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 W mA A
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ST3237E
Electrical characteristics
Table 7.
Symbol IOL VOL VOH VRIN VRIL
Receiver (C1 - C4 = 0.1F tested at 3.3V10%, VCC = 3V to 5.5V, TA = -40 to 85C, 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 8.
Symbol
Timing characteristics (C1 - C 4 = 0.1F tested at 3.3V10%, V CC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Parameter Test conditions RL = 3K, C L= 1000pF one transmitter switching, VHSCI=GND RL = 3K, C L= 250pF one transmitter switching, VHSCI=VCC VCC= 3 to 4.5V RL = 3K, C L= 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
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Application circuits
ST3237E
4
Application circuits
Figure 3. Application circuits
Table 9.
VCC 3.0 to 3.6 3.1 to 3.6 4.5 to 5.5 3.0 to 5.5
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
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ST3237E
Typical performance characteristics
5
Typical performance characteristics
(unless otherwise specified TJ = 25C) Figure 4. 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 2KV HBM ESD protection versus ground by means of diodes.
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Application note
ST3237E
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
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.
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ST3237E Figure 9. IEC 1000-4-2 circuit
Application note
Figure 10. IEC 1000-4-2 current waveform
Table 10.
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 switch 0.7 to 1ns 0.7 to 1ns 0.7 to 1ns 0.7 to 1ns Current at 30 ns ( 30%) 4A 8A 12 A 16 A Current at 60 ns ( 30%) 2A 4A 6A 8A
Level
1 2 3 4
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Application note
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 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
8 (max.)
0016023
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ST3237E
Application note
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
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Application note
ST3237E
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
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ST3237E
Application note
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
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Revision history
ST3237E
7
Table 11.
Date
Revision history
Revision history
Revision 5 6 TSSOP has been removed. Order codes has been updated and new template. Changes
21-Mar-2005 24-Mar-2006
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ST3237E
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