ST3243B ST3243C 3 to 5.5 V, 400 Kbps, RS-232 transceiver with auto-power-down Features ■ 1 µA supply current achieved when in autopower-down ■ 250 kbps minimum guaranteed data rate ■ Guaranteed 6 V/µs slew rate range ■ Guaranteed mouse drive ability ■ 0.1 µF external capacitors ■ Meet EIA/TIA-232 specifications down to 3 V ■ Available in SSOP-28 and TSSOP28 Description The ST3243 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. The receiver R2 is always active to implement a wake-up feature for serial port. The ST3243 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. SSOP TSSOP 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 Autopower-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, hand-held equipment, peripherals and printers. 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 mA. Disconnecting the serial port or turning off the Table 1. Device summary Order code Temperature range Package Packaging ST3243CPR 0 to 70 °C SSOP-28 (tape and reel) 1350 parts per reel ST3243BTR -40 to 85 °C TSSOP28 (tape and reel) 2500 parts per reel November 2007 Rev 8 1/22 www.st.com 22 Contents ST3243B - ST3243C Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 ST3243B - ST3243C 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- -5.5V 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 15 R5OUT Fifth receiver output voltage 16 R4OUT Fourth receiver output voltage 3/22 Pin configuration Table 2. ST3243B - ST3243C Pin description (continued) Pin n° Symbol 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 overrides 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+ 5.5V Generated by the charge pump 28 C1+ Positive terminal of voltage-charge pump capacitor Table 3. Name and function Negative terminal of voltage-charge pump capacitor Truth table FORCE OFF TOUT ROUT R2OUTB 0 HIGH Z HIGH Z ACTIVE (1) 1 ACTIVE (1) ACTIVE (1) ACTIVE (1) 1. If the part is in auto-power-down mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown, if no valid RS-232 levels are present on all receiver input 4/22 ST3243B - ST3243C Maximum ratings 2 Maximum ratings Table 4. Absolute maximum ratings Symbol Parameter 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, Input voltage FORCEOFF, TIN RIN Receiver input voltage range Transmitter output voltage range TOUT ROUT ROUTB INVALID tSHORT Tstg Note: Value Receiver output voltage range Short circuit duration on TOUT (one at a time) Continuous Storage temperature range -65 to 150 1 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 +7 V, but their absolute addition can not exceed 13 V. 2 The device doesn’t meet 1 kV ESD HBM °C 5/22 Electrical characteristics ST3243B - ST3243C 3 Electrical characteristics Table 5. 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 Symbol Parameter Test conditions IASHDN Supply current auto-power-down ISHDN Shutdown supply current ISHDN VCC = 3.3 or 5.0V TA = 25°C Supply current auto-power-down FORCEON = FORCEOFF = VCC disabled No Load Table 6. Symbol Typ. Max. Unit VCC = 3.3 or 5.0V, TA = 25°C All R_IN open, FORCEOFF = VCC 1 10 µA VCC = 3.3 or 5.0V, TA = 25°C All R_IN open, FORCEOFF = GND 1 10 µA 0.3 1 mA Logic input electrical characteristics (C1 - C4 = 0.1 µA, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C Parameter Test conditions VTIL Input logic threshold low T-IN, FORCEON, FORCEOFF VTIH Input logic threshold high T-IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5V VTHYS Min. 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 = 1.6mA 0.4 V VOH Output voltage high IOUT = -1mA Table 7. Symbol VCC-0.6 VCC-0.1 Auto-power-down 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 Parameter Test conditions Min. VRITE Receiver input threshold to transmitter enabled Positive threshold Negative threshold 2.7 VRITD Receiver input threshold to transmitter disabled 1 µA Supply Current -0.3 VIOL INVALID Output voltage LOW VIOH INVALID Output voltage HIGH tWU Receiver threshold to transmitter enabled 6/22 V Typ. VCC-0.6 IOUT = 1.6mA Max. Unit 2.7 V V 0.3 V 0.4 V V 250 ms ST3243B - ST3243C Table 7. Symbol Auto-power-down 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 Parameter tinvh Receiver positive or negative threshold to INVALID HIGH tinvL Receiver positive or negative threshold to INVALID LOW Table 8. Symbol Electrical characteristics Test conditions Min. IOUT = -1mA Typ. Max. Unit 1 ms 30 ms Transmitter 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 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- = 0V, VOUT = ± 2V 300 10M Ω ISC VOT Table 9. Symbol ± 35 Output short circuit current Transmitter output voltage T1IN = T2IN = GND, T3IN = VCC T3OUT loaded with 3KΩ to GND T1OUT and T2OUT loaded with 2.5mA each ± 60 ±5 mA V Receiver 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 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 = 5.0V VRIH RS-232 Input threshold high TA = 25°C, VCC = 3.3V TA = 25°C, VCC = 5.0V VRIHYS Input hysteresis RRIN Input resistance Min. Typ. -25 0.6 0.8 Max. Unit 25 V 1.2 1.2 1.5 1.8 V 2.4 2.4 0.5 TA = 25°C 3 5 V V 7 kΩ 7/22 Electrical characteristics Table 10. Symbol ST3243B - ST3243C Timing 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 Parameter Test conditions RL = 3KΩ, CL= 1000pF one transmitter switching Min. Typ. Max. Unit 250 400 kbps DR Maximum data rate tPHL tPLH Receiver propagation delay RIN to ROUT, CL = 150pF 0.15 µs Transmitter skew 100 ns 50 ns tT_SKEW tR_SKEW Receiver skew tINVH Receiver positive or negative threshold to INVALID HIGH 1 ms tINVL Receiver positive or negative threshold to INVALID LOW 30 ms SRT 8/22 Transition slew rate VCC = 3.3V TA = 25°C RL = 3K to 7KΩ measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF CL = 150pF to 2500pF 6 4 30 30 V/µs V/µs ST3243B - ST3243C Application 4 Application Figure 2. Application circuits Table 11. Capacitance value (μF) VCC C1 C2 C3 C4 Cbypass 3.0 to 3.6 0.1 0.1 0.1 0.1 0.1 9/22 Application Table 11. ST3243B - ST3243C Capacitance value (μF) VCC C1 C2 C3 C4 Cbypass 4.5 to 5.5 0.047 0.33 0.33 0.33 0.33 3.0 to 5.5 0.22 1.0 1.0 1.0 0.22 10/22 ST3243B - ST3243C Typical performance characteristics 5 Typical performance characteristics Figure 3. Unless otherwise specified TJ = 25 °C Invalid high threshold time Figure 4. Figure 5. Receiver propagation delay Figure 6. Invalid low threshold time Receiver output enable & disable time 11/22 Typical performance characteristics Figure 7. 12/22 Output current vs output high voltage ST3243B - ST3243C Figure 8. Output current vs output low voltage ST3243B - ST3243C 6 Package mechanical data 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 13/22 Package mechanical data 14/22 ST3243B - ST3243C ST3243B - ST3243C Package mechanical data SSOP28 mechanical data mm. inch. Dim. Min. Typ. A Max. 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 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 15/22 Package mechanical data 16/22 ST3243B - ST3243C ST3243B - ST3243C 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 17/22 Package mechanical data ST3243B - ST3243C Tape & reel SSOP28 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 18/22 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 ST3243B - ST3243C Package mechanical data 19/22 Package mechanical data ST3243B - ST3243C 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 20/22 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 ST3243B - ST3243C Revision history 7 Revision history Table 12. Document revision history Date Revision Changes 19-Sep-2004 6 Document updating. 31-Mar-2006 7 Order codes updated. 12-Nov-2007 8 Added Table 1. 21/22 ST3243B - ST3243C 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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