ST3243EB ST3243EC ± 15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver with auto power-down Features ■ ESD protection for RS-232 I/O pins: – ± 8 kV IEC 1000-4-2 contact discharge – ± 15 kV human body model ■ 1 µA supply current achieved when in auto power-down ■ 250 kbps minimum guaranteed data rate ■ Guaranteed 6 V/ms slew rate range ■ Guaranteed mouse drive ability ■ 0.1 µF external capacitors ■ Meet EIA/TIA-232 specifications down to 3 V ■ Available in TSSOP28 package TSSOP Description The ST3243E device consists of 3 drivers, 5 receivers and a dual charge-pump circuit. The device meets the requirements of EIA/TIA and V.28/V.24 communication standards providing high data rate capability and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver input are protected to ± 8 kV USING IEC 1000-4-2 contact discharge and ± 15 kV using the human body model. The receiver R2 is always active to implement a wake-up feature for serial port. The ST3243E has a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0 V to 5.5 V supply with a dual charge pump. The device is guaranteed to run at data rates of 250 kbps while maintaining RS-232 output levels. Table 1. The auto power-down feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (expert R2B) are shut off, and supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drives causes the auto power-down condition to occur. Auto power-down can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With auto power-down enabled, the device is activated automatically when a valid signal is applied to any receiver input. Typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, handheld equipment, peripherals and printers. Device summary Order codes Temperature range Package Packaging ST3243ECTR-E 0 to 70 °C TSSOP28 (tape and reel) 2500 parts per reel ST3243EBTR - 40 to 85 °C TSSOP28 (tape and reel) 2500 parts per reel October 2009 Doc ID 8648 Rev 12 1/16 www.st.com 16 Contents ST3243EB, ST3243EC Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 Doc ID 8648 Rev 12 ST3243EB, ST3243EC Pin configuration 1 Pin configuration Figure 1. Pin configuration Table 2. Pin description Pin n° Symbol Name and function 1 C2+ Positive terminal of inverting charge pump capacitor 2 C2- Negative terminal of inverting charge pump capacitor 3 V- -5.5 V Generated by the charge pump 4 R1IN First receiver input voltage 5 R2IN Second receiver input voltage 6 R3IN Third receiver input voltage 7 R4IN Fourth receiver input voltage 8 R5IN Fifth receiver input voltage 9 T1OUT First transmitter output voltage 10 T2OUT Second transmitter output voltage 11 T3OUT Third transmitter output voltage 12 T3IN Third transmitter input voltage 13 T2IN Second transmitter input voltage 14 T1IN First transmitter input voltage Doc ID 8648 Rev 12 3/16 Pin configuration Table 2. 4/16 ST3243EB, ST3243EC Pin description (continued) Pin n° Symbol Name and function 15 R5OUT Fifth receiver output voltage 16 R4OUT Fourth receiver output voltage 17 R3OUT Third receiver output voltage 18 R2OUT Second receiver output voltage 19 R1OUT First receiver output voltage 20 R2OUTB Non-inverting complementary receiver output, always active for wake-up 21 INVALID Output of the valid signal detector. Indicates if a valid RS-232 level is present on receiver inputs logic "1" 22 FORCEOFF Drive low to shut down transmitters and on-board power supply. This over-rides all automatic circuitry and FORCEON 23 FORCEON Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) 24 C1- 25 GND Ground 26 VCC Supply voltage 27 V+ 5.5 V Generated by the charge pump 28 C1+ Positive terminal of voltage-charge pump capacitor Negative terminal of voltage-charge pump capacitor Doc ID 8648 Rev 12 ST3243EB, ST3243EC Truth tables 2 Truth tables Table 3. Invalid truth table Table 4. RS-232 Signal present at any receiver input INVALID output YES H NO L Output control truth table Force ON Force OFF Valid receiver level Operation status TOUT ROUT R2OUTB X 0 X Shutdown (Force OFF) HIGH Z HIGH Z ACTIVE 1 1 X Normal operating (Force ON) ACTIVE ACTIVE ACTIVE 0 1 YES Normal operating (Auto power-down) ACTIVE ACTIVE ACTIVE 0 1 NO Shutdown (Auto power-down) HIGH Z ACTIVE ACTIVE Doc ID 8648 Rev 12 5/16 Maximum ratings ST3243EB, ST3243EC 3 Maximum ratings Table 5. Absolute maximum ratings Symbol Parameter Value Unit -0.3 to 6 V VCC Supply voltage V+ Doubled voltage terminal (VCC -0.3) to 7 V V- Inverted voltage terminal 0.3 to -7 V 13 V -0.3 to 6 V ± 25 V ± 13.2 V -0.3 to (VCC + 0.3) V V+ +|V-| FORCEON, FORCEOFF, TIN Receiver input voltage range RIN TOUT Transmitter output voltage range ROUT ROUTB INVALID tSHORT Tstg Input voltage Receiver output voltage range Short circuit duration on TOUT (one at a time) Continuous Storage temperature range -65 to 150 °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 6. ESD performance: transmitter outputs, receiver inputs 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) ±8 kV 6/16 Doc ID 8648 Rev 12 ST3243EB, ST3243EC 4 Electrical characteristics Electrical characteristics C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C. Table 7. Symbol Electrical characteristics Parameter Test conditions Min. IASHDN Supply current auto power-down FORCEOFF = GND,FORCEON = VCC All R_IN open or grounded ISUPPLY Supply current FORCEON = FORCEOFF = VCC Shutdown supply current FORCEOFF = GND ISHDN Typ. Max. Unit 1 10 µA 0.3 1 mA 1 10 µA C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C. Table 8. Symbol Logic input electrical characteristics Parameter Test conditions VTIL Input logic threshold low T-IN, FORCEON, FORCEOFF VTIH Input logic threshold high T-IN, FORCEON, FORCEOFF VCC = 3.3 V VCC = 5 V VTHYS Min. Typ. Max. Unit 0.8 V 2 2.4 Transmitter input hysteresis V V 0.5 V IIL Input leakage current T-IN, FORCEON, FORCEOFF ± 0.01 ± 1.0 µA IOL Output leakage current Receiver disabled ± 0.05 ± 10 µA VOL Output voltage low IOUT = 1.6 mA 0.4 V VOH Output voltage high IOUT = -1 mA Doc ID 8648 Rev 12 VCC-0.6 VCC-0.1 V 7/16 Electrical characteristics ST3243EB, ST3243EC C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C, FORCEON = GND, FORCEOFF = VCC. Table 9. Symbol Auto power-down electrical characteristics Parameter Test conditions Min. Typ. Max. Unit 2.7 V VRITE Positive threshold Receiver input threshold to INVALID output voltage Negative threshold HIGH (see Figure 3) VRITD Receiver input threshold to INVALID output voltage LOW (see Figure 3) VIOL INVALID output voltage LOW IOUT = 1.6 mA VIOH INVALID output voltage HIGH IOUT = -1 mA tWU Receiver or transmitter edge transmitter enabled (see Figure 3) 100 µs tINVH Receiver positive or negative threshold to INVALID HIGH (see Figure 3) 0.2 µs tINVL Receiver positive or negative threshold to INVALID LOW (see Figure 3) 30 µs 2.7 V -0.3 0.3 V 0.4 V VCC-0.6 V C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C. Table 10. Symbol Transmitter electrical characteristics Parameter Test conditions Min. Typ. Max. Unit VTOUT Output voltage swing All Transmitter outputs are loaded with 3kΩ to GND ±5 ± 5.4 V ROUT Output resistance VCC = V+ = V- = 0 V, VOUT = ± 2 V 300 10M Ω ISC Output short circuit current VCC = 3.3 V Output leakage current VCC = 0 to 5.5V, transmitter output = ±12 V, transmitter disabled IL VOT 8/16 T1IN = T2IN = GND,T3IN = VCC T3OUT loaded with 3 kΩ to GND Transmitter output voltage T1OUT and T2OUT loaded with 2.5mA each Doc ID 8648 Rev 12 ± 40 ±5 ± 60 mA ± 25 µA V ST3243EB, ST3243EC Electrical characteristics C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C. Table 11. Symbol Receiver electrical characteristics Parameter Test conditions VRIN Receiver input voltage operating range VRIL RS-232 Input threshold low TA = 25°C, VCC = 3.3 V TA = 25°C, VCC = 5.0 V VRIH RS-232 Input threshold high TA = 25°C, VCC = 3.3 V TA = 25°C, VCC = 5.0 V VRIHYS Input hysteresis RRIN Input resistance Min. Typ. -25 0.6 0.8 Max. Unit 25 V 1.1 1.4 1.6 1.9 V 2.4 2.4 0.5 TA = 25°C 3 5 V V 7 kΩ C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C. Table 12. Symbol Timing characteristics Parameter Test conditions DR Maximum data rate RL = 3kΩ, CL= 1000 pF one transmitter switching tPHL tPLH Receiver propagation delay RIN to ROUT, CL = 150 pF Min. Typ. Max. Unit 250 400 kbps 0.15 µs tT_SKEW Transmitter skew 150 ns tR_SKEW Receiver skew 70 ns SRT Transition slew rate TA = 25°C RL = 3k to 7kΩ, VCC = 3.3 V measured from +3 V to -3 V or -3 V to +3 V CL = 150 pF to 1000 pF CL = 150 pF to 2500 pF Doc ID 8648 Rev 12 6 4 30 30 V/µs V/µs 9/16 Application circuits ST3243EB, ST3243EC 5 Application circuits Figure 2. Application circuits Table 13. Required minimum capacitance value (µF) 10/16 VCC (V) C1 C2, C3, C4, CBYPASS 3 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 Doc ID 8648 Rev 12 ST3243EB, ST3243EC Timing diagrams 6 Timing diagrams Figure 3. Auto power-down input levels Figure 4. Auto power-down input timing Doc ID 8648 Rev 12 11/16 Package mechanical data 7 ST3243EB, ST3243EC Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 12/16 Doc ID 8648 Rev 12 ST3243EB, ST3243EC Package mechanical data TSSOP28 mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. Max. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 9.6 9.7 9.8 0.378 0.382 0.386 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 1 0.65 BSC K 0° L 0.45 0.60 0.0256 BSC 8° 0° 0.75 0.018 8° 0.024 0.030 0128292B Doc ID 8648 Rev 12 13/16 Package mechanical data ST3243EB, ST3243EC Tape & reel TSSOP28 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 14/16 Typ. 0.504 22.4 0.519 0.882 Ao 6.8 7 0.268 0.276 Bo 10.1 10.3 0.398 0.406 Ko 1.7 1.9 0.067 0.075 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 Doc ID 8648 Rev 12 ST3243EB, ST3243EC Revision history 8 Revision history Table 14. Document revision history Date Revision Changes 21-Jun-2004 6 Page 6 - IL (output leakage current) mA ==> µA 31-Mar-2006 7 Order codes updated and new template. 25-Oct-2006 8 Order codes updated. 24-Aug-2007 9 Order codes updated. 09-Jul-2008 10 Removed: SO-28 and SSOP28 packages. 28-Jul-2009 11 Removed: Flip-chip28 package, modified Table 1 on page 1. 16-Oct-2009 12 Modified Table 9 on page 8. Doc ID 8648 Rev 12 15/16 ST3243EB, ST3243EC 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. 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