ST3222 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
■ 300µA SUPPLY CURRENT ■ 250Kbps MINIMUM GUARENTEED DATA RATE ■ 6V/µs MINIMUM GUARANTEED SLEW RATE ■ MEET EIA/TIA-232 SPECIFICATIONS DOWN TO 3V ■ A V A I L A B L EI NS O - 1 8A N DT S S O P 2 0
DESCRIPTION
The ST3222 is a 3V 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 3.6V power supplies. The device requires only four small 0.1µF standard external capacitors for operating from 3V supply. The ST3222 has two receivers and two drivers. T h eS T 3 2 2 2f e a t u r e sa1µA 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 1µA supply current. The device is guaranteed to run at data rates of 250Kbps while maintaining RS-232 output levels. Typical applications are Notebook, Subnotebook and Palmtop Computers, Battery Powered Equipment, Hand-Held Equipment, Peripherals and Printers. ORDERING CODES Type Temperature Range Package Comments ST3222CD 0 to 70 °C SO-18 (Tube) 50parts per tube / 20tube per box ST3222BD -40 to 85 °C SO-18 (Tube) 50parts per tube / 20tube per box ST3222CDR 0 to 70 °C SO-18 (Tape & Reel) 1000 parts per reel ST3222BDR -40 to 85 °C SO-18 (Tape & Reel) 1000 parts per reel ST3222CTR 0 to 70 °C TSSOP20 (Tape & Reel) 2500 parts per reel ST3222BTR -40 to 85 °C TSSOP20 (Tape & Reel) 2500 parts per reel ST3222 3 TO 3.6V, LOW POWER, UP TO 400KBPS, RS-232 DRIVERS AND RECEIVERS SOP TSSOP
PlN N° (SO-18) PlN N° (TSSP20) SYMBOL NAME AND FUNCTION 1 1 EN Receiver Enable Control. Drive low for normal operation. Drive high to force the receivers outputs (R_OUT) into a high-impedance state.
22 C 1+ Positive Terminal for the first Charge Pump
3 3 V+ 5.5V Generated By The Charge Pump.
44 C 1- Negative Terminal for the first Charge Pump
55 C 2+ Positive Terminal for the second Charge Pump
66 C 2- Negative Terminal for the second Charge Pump
7 7 V- -5.5V Generated By The Charge Pump.
88 T2OUT Second Transmitter Output Voltage
99 R2 IN Second Receiver Input Voltage
10 10 R2 OUT Second Receiver Output Voltage
11 NC Not Connected
11 12 T2IN Second Transmitter Input Voltage 12 13 T1IN First Transmitter Input Voltage
14 NC Not Connected
13 15 R1 OUT First Receiver Output Voltage 14 16 R1 IN First Receiver Input Voltage 15 17 T1OUT First Transmitter Output Voltage 16 18 GND Ground 17 19 VCC Supply Voltage 18 20 SHDN Active Low Shutdown Control Input. Drive Low To Shut-down Trnasmittes And Charge Pump SO-18 TSSOP20
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.
ELECTRICAL CHARACTERISTICS
(C1 -C 4 =0 . 1µF, VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) LOGIC INPUT ELECTRICAL CHARACTERISTICS (C1 -C 4 =0 . 1µF, VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Note 1: Transmitter input hysteresis is typically 250mV TRANSMITTER ELECTRICAL CHARACTERISTICS 1 -C 4 =0 . 1µFV CC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Symbol Parameter Value Unit VCC Supply Voltage -0.3 to 6 V V+ Doubled Voltage Terminal (V CC -0 . 3 )t o7 V V- Inverted Voltage Terminal 0.3 to -7 V V+ +|V-| 13 V TIN Transmitter Input Voltage Range -0.3 to 6 V SHDN Transmitter Input Voltage Range -0.3 to 6 V R IN Receiver Input Voltage Range ± 25 V TOUT Transmitter Output Voltage Range ± 13.2 V R OUT Receiver Output Voltage Range -0.3 to (V CC + 0.3) V tSHORT Transmitter Output Short to GND Time Continuous Symbol Parameter Test Conditions Min. Typ. Max. Unit ISUPPLY VCC Power Supply Current No Load V CC = 3.3V T A =2 5 ° C SHDN =V CC 0.3 1 mA ISHDN SHUTDOWN Supply Current No Load V CC = 3.3V T A =2 5 ° C SHDN =V CC 11 0 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit VIL Input Logic Threshold Low T-IN, EN, SHDN (Note 1) 0.8 V VIH Input Logic Threshold High VCC = 3.3V 2 V VHYS Transmitter Input Histeresys 0.5 V IIL Input Leakage Current T-IN, EN , SHDN ± 0.01 ± 1 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit V TOUT Output Voltage Swing All Transmitter outputs are loaded with 3KΩ to GND ± 5 ± 5.4 V RTOUT Transmitter Output Resistance VCC =V +=V -=0 V V OUT = ± 2V 300 10M Ω ITSC Output Short Circuit Current ± 60 mA ITOL Output Leakage Current V CC = 0V or 3V to 3.6V VOUT = ± 12V Transmitters Disable ± 25 µA
RECEIVER ELECTRICAL CHARACTERISTICS (C1 -C 4 =0 . 1µFV CC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) TIMING CHARACTERISTICS (C1 -C 4 =0 . 1µF, VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) Transmitter Skew is measured at the transmitter zero cross points Symbol Parameter Test Conditions Min. Typ. Max. Unit IOL Output Leakage Current R-OUT, EN =V CC , Receiver Disabled ± 0.05 ± 10 µA VRIN Receiver Input Voltage Operating Range -25 25 V VRIL Input Threshold Low T A = 25°C V CC = 3.3V 0.6 1.2 V VRIH Input Threshold High T A = 25°C V CC = 3.3V 1.5 2.4 V VRIHYS Input Hysteresis 0.5 V R RIN Input Resistance T A = 25°C 3 5 7 K Ω VROL TTL/CMOS Output Voltage Low IOUT = 1.6mA 0.4 V V ROH TTL/CMOS Output Voltage High IOUT = -1mA V CC -0.6 VCC -0.1 V Symbol Parameter Test Conditions Min. Typ. Max. Unit D R Data Transfer Rate R L =3 KΩ C L2= 1000pF one trasmitter switching 240 400 Kbps tPHLR tPLHR Propagation Delay Input to Output R XIN to RXOUT C L = 150pF 0.2 µs |tPHLT -tTHL | Transmitter Propagation Delay Difference (Note 1) 100 ns tOER Receiver Output Enable Time Normal Operation 200 ns tODR Receiver Output Disable Time Normal Operation 200 ns |tPHLR -tTHR | Receiver Propagation Delay Difference 50 ns SRT Trnasition Slew Rate T A = 25°C R L =3 KΩ to 7KΩ VCC = 3.3V measured from +3V to -3V or -3V to +3V C L = 150pF to 1000pF C L = 150pF to 2500pF V/µs V/µs
CAPACITANCE VALUE ( µF) C1 C2. C3 C4 Cbypass
DIM. mm. inch A 2.35 2.65 0.092 0.104 A1 0.1 0.3 0.004 0.012 A2 2.55 0.100 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.012 D 11.35 11.75 0.447 0.462 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10.00 10.65 0.393 0.419 h 0.25 0.75 0.010 0.029 k8 ˚ ( m a x . ) L 0.4 1.27 0.016 0.050 SO-18 MECHANICAL DATA 0070768 Be A2 A 1018 D L H A1 C E K h x 45û SO18 Seating Plane 0.10mm .004
DIM. mm. inch A 1.2 0.047 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 e 0.65 BSC 0.0256 BSC K0 ˚ 8 ˚0 ˚ 8 ˚ TSSOP20 MECHANICAL DATA c Eb A2A D PIN 1 IDENTIFICATION A1 LKe 0087225C
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