ST3222B ST3222C 3 to 3.6 V, low power, up to 400 kbps RS-232 drivers and receivers Features ■ 300 µA supply current ■ 250 kbps minimum guarantee data rate ■ 6 V/µs minimum guarantee slew rate ■ Meet EIA/TIA-232 specification down to 3 V TSSOP Description The ST3222 is a 3 V powered EIA/TIA-232 and V.28/V.24 communications interface with low power requirements and high data-rate capabilities. ST3222 has a proprietary low dropout transmitter output stage providing true RS-232 performance from 3 to 3.6 V power supplies. The device requires only four small 0.1 mF standard external capacitors for operating from 3 V supply. The ST3222 has two receivers and two drivers. The ST3222 features a 1 mA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers can remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 mA supply current. The device is guaranteed to run at data rates of 250Kbps while maintaining RS-232 output levels. Typical applications are Notebook, Sub-notebook and Palmtop Computers, Battery Powered Equipment, Hand-Held Equipment, Peripherals and Printers. Table 1. Device summary Order codes Temperature range Package Packaging ST3222CTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel ST3222BTR -40 to 85 °C TSSOP20 (tape and reel) 2500 parts per reel January 2008 Rev 6 1/13 www.st.com 13 Contents ST3222B - ST3222C Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 4 Receiver electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 ST3222B - ST3222C Pin configuration 1 Pin configuration Figure 1. Pin connection Table 2. Pin description Pin n° Symbol Name and function 1 EN Receiver enable control. Drive low for normal operation. Drive high to force the receivers outputs (R_OUT) into a high-impedance state. 2 C1+ Positive terminal for the first charge pump capacitor 3 V+ 5.5V Generated by the charge pump. 4 C1- Negative terminal for the first charge pump capacitor 5 C2+ Positive terminal for the second charge pump capacitor 6 C2- Negative terminal for the second charge pump capacitor 7 V- -5.5V Generated by the charge pump. 8 T2OUT 9 R2IN Second receiver Input voltage 10 R2OUT Second receiver output voltage 11 NC Not connected 12 T2IN Second transmitter input voltage 13 T1IN First transmitter Input voltage 14 NC Not connected 15 R1OUT 16 R1IN 17 T1OUT 18 GND Ground 19 VCC Supply voltage 20 SHDN Second transmitter output voltage First receiver output voltage First receiver input voltage First transmitter output voltage Active low shutdown control input. Drive low to shut-down transmitter and charge pump 3/13 Maximum ratings ST3222B - ST3222C 2 Maximum ratings Table 3. 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-| TIN Transmitter input voltage range RIN Receiver input voltage range TOUT Transmitter output voltage range ROUT Receiver output voltage range tSHORT Note: Transmitter output short to gnd time Continuous Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V. Running on internal charge pump, intrinsic self limitation allows exceeding those values without any damage. Startup voltage sequence (VCC, then V+, then V-) is critical, therefore it is not recommended to use this device using externally applied voltage to V+ and V-. 4/13 ST3222B - ST3222C Electrical characteristics 3 Electrical characteristics Table 4. Electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter ISUPPLY VCC power supply current No load VCC = 3.3V SHDN=VCC SHUTDOWN supply current No load VCC = 3.3V SHDN=VCC ISHDN Table 5. Symbol Test conditions Parameter Max. Unit TA = 25°C 0.3 1 mA TA = 25°C 1 10 µA Test conditions Input logic threshold low T-IN, EN, SHDN (Note:) VIH Input logic threshold high IIL Typ. Logic input electrical characteristics (C1 - C4 = 0.1 µF, VC = 3 V to 3.6 V, TA = - 40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) VIL VHYS Min. VCC = 3.3V Min. Max. Unit 0.8 V 2 Transmitter input hysteresis Input leakage current Typ. V 0.5 ± 0.01 T-IN, EN, SHDN V ±1 µA Note: Transmitter input hysteresis is typically 250 mV Table 6. Transmitter electrical characteristics (C1 - C4 = 0.1 µA VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit VTOUT Output voltage swing All transmitter outputs are loaded with 3kΩ to GND ±5 ± 5.4 V RTOUT Transmitter output resistance VCC = V+ = V- = 0V, VOUT = ± 2V 300 10M Ω ITSC Output short circuit current ITOL Output leakage current VCC = 0V or 3V to 3.6V, VOUT = ± 12V Transmitters disable ± 60 mA ± 25 µA 5/13 Electrical characteristics ST3222B - ST3222C 3.1 Receiver electrical characteristics Table 7. Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions IOL Output leakage current VRIN Receiver Input voltage operating range VRIL Input threshold low TA = 25°C, VCC = 3.3V VRIH Input threshold high TA = 25°C, VCC = 3.3V R-OUT, EN = VCC, receiver disabled Input hysteresis RRIN Input resistance VROL TTL/CMOS output voltage IOUT = 1.6mA low VROH TTL/CMOS output voltage IOUT = -1mA high Symbol DR Typ. Max. Unit ± 0.05 ± 10 µA 25 V -25 VRIHYS Table 8. Min. 0.6 1.2 1.5 V 2.4 0.5 TA = 25°C 3 VCC-0.6 5 V V 7 kΩ 0.4 V VCC0.1 V Timing characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Parameter Data transfer rate Test conditions RL = 3 kΩ CL2= 1000pF one transmitter switching Min. Typ. Max. Unit 240 400 Kbps tPHLR tPLHR Propagation delay input to RXIN to RXOUT, CL = 150pF output 0.2 µs |tPHLT - tTHL| Transmitter propagation delay difference (1) 100 ns tOER Receiver output enable time Normal operation 200 ns tODR Receiver output disable time Normal operation 200 ns 50 ns |tPHLR - tTHR| SRT Receiver propagation delay difference Transition slew rate TA = 25°C, RL = 3kΩ to 7kΩ, VCC = 3.3V measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF CL = 150pF to 2500pF 1. Transmitter skew is measured at the transmitter zero cross points 6/13 6 4 30 30 V/µs V/µs ST3222B - ST3222C Application 4 Application Figure 2. Application circuits Table 9. Capacitance value (µF) C1 C2 C3 C4 Cbypass 0.1 0.1 0.1 0.1 0.1 7/13 Application 4.1 Figure 3. Figure 5. 8/13 ST3222B - ST3222C Typical performance characteristics (unless otherwise specified TJ = 25 °C) Driver voltage transfer Figure 4. characteristics for transmitter inputs Driver voltage transfer characteristics for receiver inputs Output current vs output low voltage Output current vs output high voltage Figure 6. ST3222B - ST3222C 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 9/13 Package mechanical data ST3222B - ST3222C TSSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. A 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 6.4 6.5 6.6 0.252 0.256 0.260 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 1 e 0.65 BSC K 0° L 0.45 A 0.0256 BSC 0.60 8° 0° 0.75 0.018 8° 0.024 0.030 A2 A1 b K e L E c D E1 PIN 1 IDENTIFICATION 1 0087225C 10/13 ST3222B - ST3222C Package mechanical data Tape & reel TSSOP20 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 6.9 7.1 0.272 0.280 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 11/13 Revision history ST3222B - ST3222C 6 Revision history Table 10. Document revision history Date Revision 22-Mar-2006 5 Order codes updated. 21-Jan-2008 6 Modified: Table 3 and added Table 1. 12/13 Changes ST3222B - ST3222C 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. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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