UNISONIC TECHNOLOGIES CO., LTD UT3223 Preliminary CMOS IC +3.0V TO +5.5V POWER SUPPLY, 250KBPS, MULTICHANNAEL RS-232 LINE DRIVERS/RECEIVERS DESCRIPTION The UTC UT3223 consists of 2 drivers and 2 receivers. It meets ElA/TIA-232 and V.28/V.24 specifications, it intended for notebook computer applications. A high-efficiency, dual charge-pumps power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V~+5.5V power supply. A guaranteed data rate of 250kbps provides compatibility with popular software for communicating with PCs. The UTC UT3223 achieves 1µA supply current in shutdown condition. When the UT3223 doesn’t detect a valid signal level on its receiver inputs, the on-board power supply and drivers will shutdown, and when a valid level is applied to any RS-232 receiver input, then the system turns on again. Therefore, the system saves power without changes to the existing BIOS or operating system. The UTC UT3223 requires only 0.1µF capacitors in 3.3V operation, and can operate from input voltages ranging from +3.0V ~+5.5V. It is ideal for 3.3V-only systems, 5.0V-only systems, or mixed 3.3V and 5.0V systems that require true RS-232 performance. FEATURES * Operates With 3.0V~5.5V Power Supply * Two Drivers and Two Receivers * Operates Up To 250 kbps * Designed to Transmit at a Data Rate of 250 kbps * Low Standby Current (1µA Typical) * External Capacitors (4*0.1µF) * Accepts 5.0V Logic Input With 3.3V Supply * Serial-Mouse Drivability * Exceeds ±8KV ESD Protection(HBM) for RS-232 I/O Pins ORDERING INFORMATION Ordering Number UT3223G-P20-R www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd Package TSSOP-20 Packing Tape Reel 1 of 9 QW-R502-A91.b UT3223 Preliminary ■ MARKING PIN CONFIGURATION CMOS IC EN 1 20 FORCEOFF C1+ 2 19 VCC V+ 3 18 GND 17 T1OUT 16 R1IN 15 R1OUT C1- 4 C2+ 5 C2V- 6 7 14 FORCEON T2OUT 8 13 T1IN R2IN 9 12 T2IN R2OUT 10 11 INVALID UTC UT3223 PIN DESCRIPTION PIN NO. PIN NAME 1 EN 2 3 4 5 6 7 8 9 10 C1+ V+ C1C2+ C2VT2OUT R2IN R2OUT 11 INVALID 12 13 T2IN T1IN 14 FORCEON 15 16 17 18 19 R1OUT R1IN T1OUT GND VCC 20 FORCEOFF DESCRIPTION Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs (R_OUT) into a high-impedance state. Positive terminal of the voltage doubler charge-pump capacitor. +5.5V generated by the charge pump. Negative terminal of the voltage doubler charge-pump capacitor. Positive terminal of inverting charge-pump capacitor. Negative terminal of inverting charge-pump capacitor. -5.5V generated by the charge pump. RS-232 Transmitter 2 Output. RS-232 Receiver 2 Input. TTL/CMOS Receiver 2 Output. Output of the valid signal detector. Indicates if a valid RS-232 level is present on receiver inputs logic “1”. TTL/CMOS Transmitter 2 Input. TTL/CMOS Transmitter 1 Input. Drive high to override automatic circuitry keeping transmitters on ( FORCEOFF must be high) (Table 2). TTL/CMOS Receiver 1 Output. RS-232 Receiver 1 Input. RS-232 Transmitter 1 Output. Ground. +3.0V ~ +5.5V Supply Voltage. Drive low to shut down transmitters and on-board power supply. This over-rides all automatic circuitry and FORCEON (Table 2). UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL VCC V+ VVPUMP VCC V+ (Note 2) V- (Note 2) V+ +|V-| (Note 2) T_IN, FORCEOFF , FORCEON, EN R_IN T_OUT Input Voltages Output Voltages R_OUT, INVALID T_OUT VIN VOUT RATINGS -0.3~+6.0 -0.3~+7.0 +0.3~-7.0 +13.0 UNIT V V V V -0.3~+6.0 V ±25 ±13.2 V V -0.3~(VCC+0.3) V Short-Circuit Duration SC Continuous Power Dissipation(TA=25°C) PD 870 mW Operating Temperature TOPR -40~+85 °C Storage Temperature TSTG -65~+150 °C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. V+ and V- can have maximum magnitudes of 7.0V, but their absolute difference cannot exceed 13.0V. ELECTRICAL CHARACTERISTICS (VCC=+3.0V~+5.5V, C1~C4=0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN DC CHARACTERISTICS All R_IN open, Supply Current, Shutdown ISHDN Supply Current, Shutdown Disabled FORCEOFF =VCC, FORCEON=GND VCC=3.3V or 5.0V, FORCEOFF =GND, TA= 25°C All R_IN=GND FORCEON= FORCEOFF =VCC, no load ICC TYP MAX UNIT 1.0 10 µA 1.0 10 µA 0.3 1.0 mA 0.8 V LOGIC INPUTS Low Input Logic Threshold High Input Leakage Current RECEIVER OUTPUTS Output Leakage Current Low Output Voltage High VLGL EN ,T_IN, FORCEON, FORCEOFF VLGH EN ,T_IN, EN, FORCEON, VCC = 3.3V VCC = 5.0V FORCEOFF IIN(LK) T_IN, EN , FORCEON, FORCEOFF ±0.01 ±1.0 µA Receivers disabled IOUT = 1.6mA IOUT = -1.0mA ±0.05 ±10 0.4 µA V V 2.7 V 0.3 0.4 V V V IROUT(LK) VROUTL VROUTH 2.0 V 2.4 VCC - 0.6 VCC - 0.1 AUTOSHUTDOWN (FORCEON=GND, FORCEOFF =VCC) Receiver Input Thresholds to Transmitters INVALID Output Voltage Receiver Threshold to Transmitters Enabled Enabled VR(EN) Disabled Low High VR(DIS) VINVL VINVH tWU Positive threshold Negative threshold 1µA supply current, Fig.1 IOUT=1.6mA IOUT=-1.0mA Fig.1 Fig.2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw -2.7 -0.3 VCC - 0.6 100 µs 4 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) (VCC=+3.0V~+5.5V, C1~C4=0.1µF (Note 2), TA = TMIN to TMAX, Unless Otherwise Specified) PARAMETER SYMBOL TEST CONDITIONS MIN Receiver Positive or High tINVH Negative Threshold to Fig.2 Low tINVL INVALID RECEIVER INPUTS Input Voltage Range VRR Input Threshold Low VRINL TA=25°C Input Threshold High VRINH TA=25°C Input Hysteresis Input Resistance TRANSMITTER OUTPUTS VRINHYS VRINRES TA=25°C Output Voltage Swing VTOUTSW Output Resistance VTOUTRES Output Short-Circuit Current Output Leakage Current VCC=3.3V VCC=5.0V VCC=3.3V VCC=5.0V -25 0.6 0.8 3 All transmitter outputs loaded with 3kΩ to ±5.0 ground VCC= V+=V-=0V, 300 Transmitter output=±2V ITSC ITOUT(LK) TYP MAX UNIT 1.0 µs 30 µs 25 1.2 1.5 1.5 1.8 0.5 5 V V 2.4 2.4 7 V V kΩ ±5.4 V 10M Ω ±35 VCC=3.0V~5.0V, VOUT=±12V, Transmitters disabled ±60 mA ±25 µA TIMING CHARACTERISTICS Maximum Data Rate DR Receiver Propagation Delay Receiver Output Time Enable Disable Transmitter Skew Receiver Skew Transition-Region Slew Rate tPHL tPLH tR(EN) tR(DIS) tTS tRS SR RL=3kΩ, CL=1000pF, one transmitter 250 switching Receiver input to receiver output, CL=150pF Normal operation |tPHL – tPLH| |tPHL – tPLH| VCC=3.3V, TA=25°C, RL=3kΩ~7kΩ, CL=220pF~1000pF measured from +3V ~ -3V or -3V~+3V kbps 0.15 0.15 200 200 100 50 µs ns ns ns ns 5 35 V/µs Notes: 1. Typical values are at TA=25°C. 2. C1~C4=0.1µF, measured at 3.3V±10%. C1=0.047µF, C2~C4=0.33µF, measured at 5.0V ±10%. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC DETAILED DESCRIPTION Charge-Pump Voltage Converter The UTC UT3223 consists of a regulated dual charge pumps that provide output voltages of +5.5V and -5.5V, regardless of the input voltage (VCC) changing from +3.0V to +5.5V. The charge pumps operate in a discontinuous mode: if the output voltages are less than 5.5V, the charge pumps are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies, refer to application circuit. RS-232 Transmitters UTC UT3223’s transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They guarantee a 250kbps data rate with worst-case loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC communication software. Transmitters can be paralleled to drive multiple receivers or mouse. When FORCEOFF is driven to ground, or shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state. RS-232 Receivers The UTC UT3223’s receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one inverting three-state output. In shutdown or in autoshutdown, the UT3223’s receivers are active. Drive EN high to place the receiver in a high-impedance state. Table 1. EN Control Truth Table R_OUT Active High-Z EN 0 1 Shutdown Function A 1µA supply current is achieved with shutdown feature, which operates when FORCEON is low and FORCEOFF is high. When the UTC UT3223 senses no valid signal levels on all receiver inputs for 30µs, the on-board power supply and drivers are shut off, reducing supply current to 1µA. This occurs if the RS-232 cable is disconnected or the connected peripheral transmitters are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. INVALID indicates the receiver inputs’ condition, when using shutdown function, the INVALID output is high when the device is on and low when the device is shut down. Table 2. Shutdown Logic Control Truth Table OPERATION STATUS Normal Operation (Forced On) Normal Operation (AutoShutdown) Normal Operation (AutoShutdown) Shutdown (Forced Off) FORCEOFF INPUT H H H L UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw FORCEON INPUT H L L X INVALID OUTPUT X H L X T_OUT Active Active High-Z High-Z 6 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC DETAILED DESCRIPTION(Cont.) Table 2 summarizes the UTC UT3223 operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is asserted, the IC selects between these states automatically based on receiver input levels. Transmitters Enabled, INVALID High +2.7V Indeterminate +0.3V 0V Shutdown, Transmitters Disabled, 1µA Supply Current, INVALID Low -0.3V Indeterminate -2.7V Transmitters Enabled, INVALID High Fig.1 Shutdown Input Levels When shutdown, the UTC UT3223’s charge pumps are turned off, V+ decays to VCC, V- decays to ground, the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs. Fig.2 Shutdown Input Timing UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT 3.0V~5.5V CBYPASS VCC V+ C1+ C1 C3 UTC UT3223 C1C2+ V- C2 C4 C2T1IN LOGIC INPUTS T1OUT T1 T2IN T2OUT T2 RS-232 OUTPUTS T3OUT VCC GND GND FORCEOFF FORCEON EN R1OUT LOGIC OUTPUTS INVALID SHUTDOWN R1IN R1 5kΩ R2OUT TO POWER MANAGEMENT UNIT R2IN R2 RS-232 INPUTS 5kΩ GND Fig.3 Application Circuit Table 3. Required Capacitor Value VCC (V) 3.0~3.6 3.15~3.6 4.5~5.5 3.0~5.5 C1 (µF) 0.22 0.1 0.047 0.22 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw C2, C3, C4 (µF) 0.22 0.1 0.33 1.0 CBYPASS (µF) 0.22 0.1 0.047 0.22 8 of 9 QW-R502-A91.b UT3223 Preliminary CMOS IC UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 9 QW-R502-A91.b