ST3241EB ST3241EC ±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 autopower-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 SSOP-28 and TSSOP28 packages SSOP Description The ST3241E 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. TSSOP It is a complete serial port (3 drivers, 5 receivers) intended for notebook or sub-notebook computers. Receivers R1 and R2 have extra outputs in addition to their standard outputs. These extra output are always active. Typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers. The ST3241E 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. Device summary Order code Temperature range Package Packaging ST3241ECPR 0 to 70°C SSOP-28 (tape and reel) 1350 parts per reel ST3241EBPR -40 to 85°C SSOP-28 (tape and reel) 1350 parts per reel ST3241EBTR -40 to 85°C TSSOP28 (tape and reel) 2500 parts per reel November 2007 Rev 4 1/15 www.st.com 15 Contents ST3241EB - ST3241EC Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 ST3241EB - ST3241EC 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 17 R3OUT Third receiver output voltage 3/15 Pin configuration Table 2. Pin description (continued) Pin n° Symbol 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 R1OUTB Non-inverting complementary receiver output, always active for wake-up 22 SHDN 23 EN Receiver enable. Active low 24 C1- Negative terminal of voltage- charge pump capacitor 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. 4/15 ST3241EB - ST3241EC Name and function Shutdown control. Active low. Shutdown and enable control truth table SHDN EN TOUT ROUT ROUTB 0 0 HIGH Z ACTIVE ACTIVE 0 1 HIGH Z HIGH Z ACTIVE 1 0 ACTIVE ACTIVE ACTIVE 1 1 ACTIVE HIGH Z ACTIVE ST3241EB - ST3241EC Maximum ratings 2 Maximum ratings Table 4. Absolute maximum ratings Symbol Parameter Value Unit -0.3 to 6 V VCC Supply voltage V+ Extra positive voltage (Note: 1) (VCC -0.3) to 7 V V- Extra negative voltage (Note: 1) 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-| (Note: 1) SHDN, EN, TIN Receiver input voltage range RIN TOUT Transmitter output voltage range ROUT ROUTB INVALID tSHORT Tstg Note: Note: Input voltage Receiver output voltage range 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. 1 Table 5. Symbol V+ and V- can have a maximum magnitude of +7 V, but their absolute addition cannot exceed 13 V. ESD performance: transmitter outputs, receiver inputs 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 5/15 Electrical characteristics ST3241EB - ST3241EC 3 Electrical characteristics Table 6. 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 ISUPPLY ISHDN Table 7. Symbol Parameter Test conditions Supply current No load VCC = 3.3V or 5V, TA = 25°C Shutdown supply current SHDN = GND, TA = 25°C Parameter Test conditions Input logic threshold low TIN, EN, SHDN VTIH Input logic threshold high VCC = 3.3V VCC = 5V Input leakage current TIN, EN, SHDN Table 8. Symbol Parameter Test conditions Output Leakage Current ROUT, EN, Receiver Disabled VOL Output Voltage Low IOUT = 1.6mA VOH Output Voltage High IOUT = -1mA Symbol Max. Unit 0.3 1 mA 1 10 µA Min. Typ. Max. Unit 0.8 V 2 2.4 V V ± 0.01 ± 1.0 µA Receiver output electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. IOL Table 9. Typ. Logic input and receiver output electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. VTIL IIL Min. Min. Typ. Max. Unit ± 0.05 ± 10 µA 0.4 V VCC-0.1 V VCC-0.6 Transmitter electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. 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 IL VTO 6/15 ± 35 Output short circuit current Output leakage current VCC = 0 to 5.5V, transmitter output = ±12V, transmitter disabled Transmitter output voltage T1IN = T2IN = GND, T3IN = VCC T3OUT loaded with 3kΩ to GND T1OUT and T2OUT loaded with 2.5mA each ±5 ± 60 mA ± 25 µA V ST3241EB - ST3241EC Table 10. Symbol Electrical characteristics Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. 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 Table 11. Symbol Min. Typ. -25 0.6 0.8 Max. Unit 25 V 1.2 1.5 1.5 1.8 V 2.4 2.4 0.3 TA = 25°C 3 5 V V 7 kΩ Timing characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Parameter Test Conditions RL = 3kΩ, CL= 1000pF one transmitter switching Min. Typ. Max. Unit DR Maximum data rate tPHL tPLH Receiver propagation delay RIN to ROUT, CL = 150pF 0.15 µs Transmitter skew 100 ns 300 ns tT_SKEW 250 tR_SKEW Receiver skew SRT 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 kbps 30 30 V/µs V/µs 7/15 Application ST3241EB - ST3241EC 4 Application Figure 2. Application circuits Table 12. Required minimum 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 ST3241EB - ST3241EC 5 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 9/15 Package mechanical data ST3241EB - ST3241EC 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 10/15 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 ST3241EB - ST3241EC 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 11/15 Package mechanical data ST3241EB - ST3241EC 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 12/15 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 ST3241EB - ST3241EC Package mechanical data 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 13/15 Revision history ST3241EB - ST3241EC 6 Revision history Table 13. Document revision history Date Revision 21-Jun-2004 2 The IL (Output Leakage Current) mA ==> µA in table 8. 03-Apr-2006 3 Order code updated. 13-Nov-2007 4 Added Table 1. 14/15 Changes ST3241EB - ST3241EC Please Read Carefully: Information in this document is provided solely in connection with ST products. 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