ST3243 3 TO 5.5V, 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN ■ ■ ■ ■ ■ ■ ■ 1µA SUPPLY CURRENT ACHIEVED WHEN IN AUTO-POWERDOWN 250Kbps MINIMUM GUARANTEED DATA RATE GUARANTEED 6V/µs SLEW RATE RANGE GUARANTEED MOUSE DRIVEABILITY 0.1µF EXTERNAL CAPACITORS MEET EIA/TIA-232 SPECIFICATIONS DOWN TO 3V AVAILABLE IN SO-28, 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 3.0V to 5.5V supply with a dual charge pump. The device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels. The Auto-powerdown 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 1mA. Disconnecting January 2004 SOP SSOP TSSOP the serial port or turning off the peripheral drives causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With Auto-powerdown 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. 1/14 ST3243 ORDERING CODES Type Temperature Range Package Comments ST3243CD ST3243BD ST3243CDR ST3243BDR ST3243CPR ST3243BPR ST3243CTR ST3243BTR 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C SO-28 (Tube) SO-28 (Tube) SO-28 (Tape & Reel) SO-28 (Tape & Reel) SSOP-28 (Tape & Reel) SSOP-28 (Tape & Reel) TSSOP28 (Tape & Reel) TSSOP28 (Tape & Reel) 27parts per tube / 12tube per box 27parts per tube / 12tube per box 1000 parts per reel 1000 parts per reel 1350 parts per reel 1350 parts per reel 2500 parts per reel 2500 parts per reel PIN DESCRIPTION PlN N° SYMBOL 1 2 C2- 3 4 VR1IN -5.5V Generated by the Charge Pump 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 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 Output of the valid signal detector. Indicates if a valid RS-232 level is present on receiver inputs logic "1" Drive low to shut down transmitters and on-board power supply. This over-rides all automatic circuitry and FORCEON Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) Negative Terminal of Voltage- Charge Pump Capacitor 21 22 23 INVALID FORCEOFF FORCEON Positive Terminal of Inverting Charge Pump Capacitor Negative Terminal of Inverting Charge Pump Capacitor 24 C1- 25 GND VCC Ground Supply Voltage V+ C1 + 5.5V Generated by the Charge Pump Positive Terminal of Voltage- Charge Pump Capacitor 26 27 28 2/14 NAME AND FUNCTION C2 + ST3243 PIN CONFIGURATION TRUTH TABLE FORCE OFF TOUT ROUT R2OUTB 0 1 HIGH Z ACTIVE * HIGH Z ACTIVE * ACTIVE * ACTIVE * * If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown, if no valid RS-232 levels are present on all receiver input ABSOLUTE MAXIMUM RATINGS Symbol Parameter VCC Supply Voltage V+ Doubled Voltage Terminal VInverted Voltage Terminal V+ +|V-| FORCEON, Input Voltage FORCEOFF, TIN RIN TOUT Receiver Input Voltage Range Transmitter Output Voltage Range ROUT ROUTB Receiver Output Voltage Range INVALID tSHORT Short Circuit Duration on TOUT (one at a time) Tstg Storage Temperature Range Value Unit -0.3 to 6 V (VCC -0.3) to 7 V 0.3 to -7 13 V V -0.3 to 6 V ± 25 V ± 13.2 V -0.3 to (VCC + 0.3) V Continuous -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. (*) The device doesn’t meet 1KV ESD HBM 3/14 ST3243 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 IASHDN Supply Current Auto-powerdown VCC = 3.3 or 5.0V All R_IN open ISHDN Shutdown Supply Current ISHDN Supply Current Auto-powerdown Disabled VCC = 3.3 or 5.0V TA = 25°C All R_IN open FORCEOFF = GND VCC = 3.3 or 5.0V TA = 25°C FORCEON = FORCEOFF = VCCNo Load Min. TA = 25°C FORCEOFF = VCC Typ. Max. Unit 1 10 µA 1 10 µA 0.3 1 mA Typ. Max. Unit 0.8 V LOGIC INPUT 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 VTIL Input Logic Threshold Low T-IN, FORCEON, FORCEOFF VTIH Input Logic Threshold High T-IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5V Min. 2 2.4 V V IIL Transmitter Input Hysteresis 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 VOH Output Voltage High IOUT = -1mA VTHYS 0.5 V 0.4 VCC-0.6 VCC-0.1 V V AUTO-POWERDOWN 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 VRITE Receiver Input Threshold to Transmitter Enabled Receiver Input Threshold to Transmitter Disabled INVALID Output Voltage LOW INVALID Output Voltage HIGH Receiver Threshold to Transmitter Enabled Receiver Positive or Negative Threshold to INVALID HIGH Receiver Positive or Negative Threshold to INVALID LOW VRITD VIOL VIOH tWU tinvh tinvL 4/14 Test Conditions Positive Threshold Negative Threshold 1µA Supply Current Min. Typ. 2.7 -0.3 VCC-0.6 Max. Unit 2.7 0.3 V V V 0.4 V V IOUT = 1.6mA 250 µs IOUT = -1mA 1 µs 30 µs ST3243 TRANSMITTER 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 VTOUT Output Voltage Swing ROUT Output Resistance ISC Output Short Circuit Current VOT Transmitter Output Voltage Test Conditions All Transmitter outputs are loaded with 3KΩ to GND VCC = V+ = V- = 0V VOUT = ± 2V Min. Typ. ±5 ± 5.4 300 10M ± 35 T1IN = T2IN = GND, T3IN = VCC T3OUT loaded with 3KΩ to GND Max. Unit V Ω ± 60 ±5 mA V T1OUT and T2OUT loaded with 2.5mA each RECEIVER 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 VRIN VRIL VRIH Parameter Test Conditions Receiver Input Voltage Operating Range RS-232 Input Threshold Low TA = 25°C TA = 25°C VCC = 3.3V VCC = 5.0V RS-232 Input Threshold High TA = 25°C TA = 25°C VCC = 3.3V VCC = 5.0V Min. Typ. -25 0.6 0.8 Max. Unit 25 V 1.2 1.2 1.5 1.8 V 2.4 2.4 V 5 7 KΩ Min. Typ. Max. Unit 250 400 Kbps 0.15 µs tT_SKEW Transmitter Skew 100 ns tR_SKEW Receiver Skew 50 ns 1 µs 30 µs VRIHYS Input Hysteresis RRIN Input Resistance 0.5 TA = 25°C 3 V TIMING 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 DR tPHL tPLH tINVH tINVL SRT Parameter Test Conditions Maximum Data Rate RL = 3KΩ CL= 1000pF one transmitter switching Receiver Propagation Delay RIN to ROUT CL = 150pF Receiver Positive or negative Threshold to INVALID HIGH Receiver Positive or negative Threshold to INVALID LOW Transition Slew Rate TA = 25°C RL = 3K to 7KΩ VCC = 3.3V 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 5/14 ST3243 APPLICATION CIRCUITS CAPACITANCE VALUE (µF) VCC C1 C2 C3 C4 Cbypass 3.0 to 3.6 4.5 to 5.5 3.0 to 5.5 0.1 0.047 0.22 0.1 0.33 1.0 0.1 0.33 1.0 0.1 0.33 1.0 0.1 0.33 0.22 6/14 ST3243 TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C) Figure 1 : INVALID HIGH Threshold Time Figure 4 : Receiver Output Enable & Disable Time Figure 2 : INVALID LOW Threshold Time Figure 5 : Output Current vs Output High Voltage Figure 3 : Receiver Propagation Delay Figure 6 : Output Current vs Output Low Voltage 7/14 ST3243 SO-28 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 2.65 MAX. 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 8 ˚ (max.) 0016023 8/14 ST3243 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 9/14 ST3243 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 10/14 ST3243 Tape & Reel SO-28 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 30.4 0.519 1.197 Ao 10.8 11.0 0.425 0.433 Bo 18.2 18.4 0.716 0.724 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 11/14 ST3243 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 12/14 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 ST3243 Tape & Reel TSSOP28 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 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 13/14 ST3243 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 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