ST3237 3 to 5.5V, 250Kbps, RS-232 Transceiver with stand-by Feature summary ■ 1µA low power shutdown with receivers active ■ Guaranteed 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 ■ 500uA low supply current ■ Meet EIA/TIA-232 specifications down to 3V ■ Available in SSOP-28 SSOP Description 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. The ST3237 is a 3V to 5.5V powered EIA/TIA-232 and V.28/V.24 communication interfaces high data-rate capabilities. ST3237 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 Order codes Part number Temperature range Package Packaging ST3237BPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel January 2007 Rev 8 1/15 www.st.com 15 Contents ST3237 Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 ST3237 Pin configuration 1 Pin configuration Figure 1. Pin description Table 1. Pin description PlN N° SYMBOL NAME AND FUNCTION 1 C2+ Positive Terminal of Inverting Charge Pump Capacitor 2 GND Ground 3 C2- 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 R1IN First Receiver Input Voltage 9 R2IN Second Receiver Input Voltage 10 T4OUT 11 R3IN 12 T5OUT 13 EN 14 SHDN Shutdown Control, Active Low 15 VHSCI Very High Speed Control Input. Connect to GND for normal operation; connect to VCC for 1Mbps transmission rates. 16 R1OUTB Non Inverting Complementary Receiver Output. Always Active. 17 T5IN Fifth Transmitter Input Voltage 18 R3OUT Third Receiver Output Voltage Fourth Transmitter Output Voltage Third Receiver Input Voltage Fifth Transmitter Output Voltage Receiver Enable, Active Low 3/15 Pin configuration Table 1. 4/15 ST3237 Pin description PlN N° SYMBOL NAME AND FUNCTION 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- Charge Pump Capacitor 26 VCC Supply Voltage 27 V+ -5.5V Generated by the Charge Pump 28 C1+ Positive Terminal of Voltage- Charge Pump Capacitor ST3237 Absolute maximum ratings 2 Absolute maximum ratings Table 2. Absolute maximum ratings 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 13 V -0.3 to 6 V -0.3 to 6 V V+ +|V-| TIN Transmitter Input voltage range SHDN, EN VHSCI Very high speed control input -0.3 to (VCC +0.3) V RIN Receiver input voltage range ± 25 V ± 13.2 V -0.3 to (VCC + 0.3) V TOUT Transmitter output voltage range ROUT ROUTB Receiver output voltage range tSHORT TSTG Note: 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. 5/15 Electrical characteristics ST3237 3 Electrical characteristics Table 3. 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 Test conditions VCC = 3V or 5.0V ISUPPLY VCC power supply current No load 25°C ISHDN Shutdown supply current SHDN=GNDTA = 25°C Table 4. VTIH TA = Typ. Max. Unit 0.5 2 mA 1 10 µA Logic input (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 Min. Parameter Input logic threshold low (1) Test Conditions Min. Typ. T-IN, VHSCI, EN, SHDN Input logic threshold high VCC = 3.3V (1) VCC = 5V Max. Unit 0.8 V 2 2.4 V V IIL Input leakage current T-IN, VHSCI, EN, SHDN ± 0.01 ± 1.0 µA IOL Output leakage current Receiver disabled ± 0.05 ± 10 µA VOL Output voltage low IOUT = 1.6mA 0.4 V VOH Output voltage high IOUT = -1mA VCC0.6 VCC0.1 V 1. Transmitter input hysteresis is typically 250mV Table 5. Symbol Transmitter (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) Parameter Test conditions Min. Typ. ±5 ± 5.4 V 3000 W VTOUT Output voltage swing All transmitter outputs are loaded with 3KΩ to GND RTOUT Transmitter output resistance VCC = V+ = V- = 0VVOUT = ± 2V ISC Output short circuit current 6/15 ± 25 Max. ± 60 Unit mA ST3237 Table 6. Symbol Electrical characteristics Receiver (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) Parameter Test Conditions VRIN Receiver input voltage operating range VRIL RS-232 input threshold low TA = 25°C, VCC = 3.3V TA = 25°C, VCC = 5V VRIH RS-232 input threshold high TA = 25°C, VCC = 3.3V TA = 25°C, VCC = 5V VRIHYS Input hysteresis RRIN Input resistance Table 7. Symbol DR tPHLR tPLHR Min. Typ. -25 0.6 0.8 Max. Unit 25 V 1.2 1.5 1.5 1.8 V V 2.4 2.4 0.3 TA = 25°C 3 5 V V V 7 KΩ Timing characteristics (C1 - C4 = 0.1mF 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) Parameter Maximum data rate Test Conditions Min. RL = 3KΩCL= 1000pF one transmitter switching, VHSCI=GND 250 Kbps RL = 3KΩCL= 250pF one transmitter switching, VHSCI=VCC VCC= 3 to 5.55V 1000 Kbps Propagation delay input to RIN to ROUT, CL = 150pF output Typ. Max. Unit 0.15 µs |tPHL - tTLH|, VHSCI=GND 100 ns |tPHL - tTLH|, VHSCI=VCC 60 ns tT_SKEW Transmitter skew tR_SKEW Receiver skew |tPHL - tTLH| 50 ns tOER Receiver output enable time Normal operation 80 ns tODR Receiver output disable time Normal operation 130 ns Transition slew rate VCC = TA = 25°C RL = 3 to 7KΩ 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 Note: 6 24 4 30 150 30 V/µs V/µs V/µs Transmitter Skew is measured at the transmitter zero cross points 7/15 Application circuit ST3237 4 Application circuit Figure 2. Application circuits Table 8. Capacitance value (µF) 8/15 VCC C1 C2 C3 C4 Cbypass 3.0 to 3.6 0.1 0.1 0.1 0.1 0.1 4.5 to 5.5 0.047 0.33 0.33 0.33 0.1 3.0 to 5.5 0.1 0.47 0.47 0.47 0.1 ST3237 Typical performance characteristics 5 Typical performance characteristics Figure 3. (unless otherwise specified TJ = 25°C) Input voltage range TJ =25°C Figure 4. Figure 5. Transfer characteristics for receiver Figure 6. Transfer characteristics for received Figure 7. Output current vs output high voltage Output current vs output low voltage Figure 8. Transfer characteristics for transmitter 9/15 Typical performance characteristics Figure 9. ZZZ 10/15 Receiver input resistance ST3237 ST3237 Package mechanical data 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 11/15 Package mechanical data ST3237 SSOP28 MECHANICAL DATA mm. inch DIM. MIN. TYP A 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 12/15 MAX. 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 ST3237 Package mechanical data 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 Revision history ST3237 7 Revision history Table 9. Revision history Date Revision 21-Mar-2005 5 TSSOP has been removed. 24-Mar-2006 6 Order codes has been updated and new template. 25-Oct-2006 7 Order codes has been updated. 16-Jan-2007 8 The DR min. value on Table 7. has been corrected: 100kbps ==> 1000kbps. 14/15 Description of Changes ST3237 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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