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| STC International Limited http://www.mcu-memory.com www..com STC3232E High ESD-Protected, Low Power, 3.3V to 5.5V, True RS-232 Transceivers General Description The STC3232E is 2 driver, 2 receiver RS-232 transceiver solutions intended for portable or hand-held applications, features low power consumption, high data-rate capabilities, and enhanced ESD protection. The ESD tolerance of the STC3232E devices is over 15kV for both human body model and IEC1000-4-2 air discharge test methods. A low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1 capacitors for operation from a +3.3V F supply. Each device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels. The STC3232E is pin, package, and functionally compatible with the industry-standard MAX232. Applications Notebook, Sub notebook, and Palmtop Computers Battery-Powered / Hand-Held Equipment POS terminal / Intelligent Network Switch DMM / Printers Smart Phones xDSL Modems Features Interoperable with EIA/TIA - 232 and adheres to EIA/TIA - 562 Enhanced ESD Specifications: 15kV Human Body Model 15kV IEC1000-4-2 Air Discharge 8kV IEC1000-4-2 Contact Discharge 250 kbps Minimum Transmission Rate Ideal for Handheld, Battery Operated Applications Latch up Free Guaranteed 30V/ Max Slew Rate s BiCMOS Technology Ordering Information PART STC3232EESE STC3232EEPE TEMP. RANGE -40 to +85 C C -40 to +85 C C PIN-PACKAGE 16 Narrow SO 16 Plastic DIP STC3232E Datasheet Rev.0.1, Dec.2005 Page 1 of 7 STC International Limited http://www.mcu-memory.com www..com Pin Configurations C1+1 V+ 2 C1- 3 C2+4 C2- 5 V- 6 T2 7 OUT R2 8 IN DIP/SO STC 3232E 16 Vcc 15 GND 14 T1 OUT 13 R1 IN 12 R1 OUT 11 T1 IN 10 T2 IN 9 R2 OUT Absolute Maximum Ratings VCC... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to +6V V+ ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... - 0.3V to +7V V- ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... +0.3V to-7V Input Voltages T_IN... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to +6V R_IN... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 25V Output Voltages T_OUT... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 13.2V R_OUT... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to (VCC + 0.3V) Stresses beyond those listed under " Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Short-Circuit Duration, T_OUT... ... ... ... ... ... ... ... ... ... ... ... Continuous Continuous Power Dissipation (TA = +70 C) 16-Pin Plastic DIP (derate 10.53mW/ above +70 ... ... ... ... 842mW C C) 16-Pin Narrow SO (derate 8.70mW/ above +70 ... ... ... ... 696mW C C) Operating Temperature Ranges STC3232E... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -40 to +85 C C Storage Temperature Range... ... ... ... ... ... ... ... ... -65 to +165 C C Lead Temperature (soldering, 10sec) ... ... ... ... ... ... ... ... ... +300 C STC3232E Datasheet Rev.0.1, Dec.2005 Page 2 of 7 STC International Limited http://www.mcu-memory.com www..com Electrical Characteristics (VCC = +3V to +5.5V, C1-C4 = 0.1 TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25 F, C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = +3.3V OR +5.5V, TA = +25 ) C VCC Supply Current Shutdown Supply Current LOGIC Input Leakage Current Input Threshold Low Input Threshold High Output Voltage Low Output Voltage High EIA/TIA-232E RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance EIA/TIA-232E TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short Circuit Current TIMING CHARACTERISTICS Maximum Data Rate RL = 3 kO to 7 kO, CL = 50pF to 1000pF, one transmitter switching Receiver Propagation Delay Transmitter Propagation Delay tPLHR, tPHLR tPLHT, tPHLT CL= 150pF RL = 3 kO, CL = 2500pF, all transmitters loaded Transition-Region Slew rate TA = +25 VCC = 3.3V RL = 3 kO to 7 kO, C, CL = 50pF to 1000pF, measured from -3V to +3V or +3V to -3V, ESD & LATCH UP PERFORMANCE ESD Protection Voltage Human Body Model IEC1000-4-2, Contact Discharge IEC1000-4-2, Air-Gap Discharge Latch up Performance 15 8 15 200 kV kV kV mA 3 6 30 V/s 0.15 0.1 s s 250 kbps All drivers loaded with 3kO to ground 5 300 5.4 500 60 V O mA TA = +25 VCC = 3.3V C, TA = +25 VCC = 3.3V C, VCC = 3.3V TA = +25 VCC = 3.3V C, 0.1 3 5 -25 0.6 1.1 1.5 2. 4 0.2 7 25 V V V V kO VIL VIH VOH VOL T_IN, /SHDN, /EN T_IN, /SHDN, /EN T_IN, /SHDN, /EN R_OUT; IOUT = 3.2mA R_OUT; IOUT = -1.0mA VCC-0.6 VCC-0.1 2.0 0.4 1 0.8 A V V V V ICC ISHDN /SHDN = VCC , No Load, TA = +25 C /SHDN = GND, No Load, TA = +25 C 0.3 1 1 10 mA A STC3232E Datasheet Rev.0.1, Dec.2005 Page 3 of 7 STC International Limited http://www.mcu-memory.com www..com Pin Descriptions PIN NAME (SO/DIP/SSOP) -- 1 2 3 4 5 6 7, 14 8, 13 9, 12 10, 11 15 /EN C1+ V+ C1C2+ C2VT_OUT R_IN R_OUT T_IN GND VCC Receiver Enable. Active low. Positive Terminal of Voltage-Doubler Charge-Pump Capacitor +5.5V Generated by the Charge Pump Negative Terminal of 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 Outputs RS-232 Receiver Inputs TTL/CMOS Receiver Outputs TTL/CMOS Transmitter Inputs Ground +3.0V to +5.5V Supply Voltage FUNCTION TRANSMITTER OUTPUT VOLTAGE(V) 16 Typical Operating Characteristics SUPPLY CLRRENT (mA (c) (VCC = +3V to +5.5V, C1-C4 = 0.1 TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25 F, C.) 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 TRANSMITTER OUTPUT VOLTAGE RATE VS.LOAD CAPACITANCEOPERATION SUPPLY CURRENT SLEW VS.LOAD CAPACITANCE VS.LOAD CAPACITANCE 16 45 14 40 12 35 10 30 25 8 20 6 15 4 10 2 5 0 0 0 10002000300040005000 10002000300040005000 0 10002000300040005000 LOAD CAPACITANCE(pF) LOAD CAPACITANCE (c) pF LOAD CAPACITANCE (c) pF SLEW RATE(V/uS) STC3232E Datasheet Rev.0.1, Dec.2005 Page 4 of 7 STC International Limited Typical Operating Circuits +3.3V OBYPASS 16 1 C1+ Vcc V+ 2 C1 3 C3 C1STC3232E 4 C2+ C2 5 V- 6 C2C4 11 T1IN 10 T2IN 12 R1OUT 9 R2OUT GND 15 T1OUT 14 7 T2OUT R1IN13 R2IN 8 http://www.mcu-memory.com www..com Detailed Description Dual Charge-Pump Voltage Converter The STC3232E' internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V s (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V VCC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a storage capacitor (C3, C4) to generate the V+ and V- supplies. RS-232 Transmitters The transmitters are inverting level translators that convert TTL/CMOS-logic levels to EIA/TIA-232 compliant 5V levels. The STC3232E transmitter guarantees a 250kbps data rate with worst-case loads of 3KO parallel with 1000pF. Transmitters can be paralleled to drive multiple receivers. The STC3232E permits the outputs to be driven up to 12V in shutdown. RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output levels. 15kV ESD Protection ESD-protection structures are incorporated to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the STC3232E have extra protection against static electricity. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Circuits keep working without latch up. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the STC3232E are characterized for protection to the following limits: 15kV using the Human Body Model 8kV using the Contact Discharge method specified in IEC 1000-4-2 15kV using the Air-Gap Discharge method specified in IEC 1000-4-2. STC3232E Datasheet Rev.0.1, Dec.2005 Page 5 of 7 STC International Limited http://www.mcu-memory.com www..com Applications Information Capacitor Selection The capacitor type used for C1- is not critical for proper operation; polarized or non-polarized capacitors can be used. C4 The charge pump requires 0.1 capacitors for 3.3V operation. Increasing the capacitor values (e.g., by a factor of 2) F reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1' value. When using the minimum required capacitor values, make sure the capacitor value does s not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor' s equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V- output voltages. Power-Supply Decoupling n most circumstances, a 0.1 VCC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a F capacitor of the same value as charge pump capacitor C1. Connect bypass capacitors as close to the IC as possible. Operation Down to 2.7V Transmitter outputs meet EIA/TIA-562 levels of 3.7V with supply voltages as low as 2.7V. Interconnection with 3V and 5V Logic The STC3232E can directly interface with various 3V and 5V logic families, including ACT and HCT CMOS. Pin Configurations and Typical Operating Circuits Vcc TOP VIEW C5 + 16 Vcc C3 + C1+ 1 V+2 C1-3 C2+ STC3232E 4 C2-5 V- 6 T2 UT O7 R2N 8 I DIP/SO 16Vcc 15GND 14T1 UT O 13R1N I 12R1 UT O 11T1N I 10V2 IN 9 R2 UT O 1 + C1 C1+ V+ 2 C2 3 C1- STC3232E 4 C2+ + 5 C2Vcc 200K | 11 T1IN +5V 200K | 10 T2IN V- 6 C4 + T1OUT 14 RS-232 OUTPUTS T2OUT7 TTL/CMOS INPUTS 12 R1OUT TTL/CMOS OUTPUTS 9 R2OUT R1IN 13 5K| R2IN 8 5K| GND 15 RS-232 INPUTS STC3232E Datasheet Rev.0.1, Dec.2005 Page 6 of 7 STC International Limited http://www.mcu-memory.com www..com Physical Dimensions Inches (millimeters)unless otherwise noted 0.386-0.394 (9.804-10.00) 16151413121110 9 0.228-0.244 (5.791-6.198) LEAD NO.1 1 2 3 4 5 6 7 8 IDENT 30 a TYP 0.010 MAX 0.254 0.150-0.157 (3.810-3.988) 0.053-0.069 0.010-0.020a A 45 (0.254-0.508) 8 MAX TYP (1.345-1.753) a ALL LEADS 0.008-0.010 (0.203-0.254) TYP ALL LEADS 0.014 0.016-0.050 (0.406-1.270) (0.356) TYP ALL LEADS 0.004-0.010 (0.102-0.254) SENTING PLANE 0.050 0.014-0.020 TYP (1.270) (0.356-0.508) TYP 0.008 TYP (0.203) 0.740-0.780 (18.80-19.81) 16 15 14 13 12 11 10 9 PIN NO.1 2 3 4 5 6 7 8 IDENT 1 OPTION 01 0.130 A 0.005 0.060 TYP (3.302 A 0.127) (1.524) 0.145-0.200 (3.683-5.080) 0.020 MIN (0.508) 0.125-0.150 (3.175-3.810) 0.014-0.023 (0.356-0.584) TYP INDEX 16 15 14 13 12 11 10 9 AREA 0.250 A 0.010 (6.350 A 0.254) PIN NO.1 2 3 4 5 6 7 8 IDENT 1 OPTION 02 0.065 4 TYP a 0.300-0.320 (1.651) OPTIONAL (7.620-8.128) 0.090 (2.286) 0.050 A 0.010 (1.270 A 0.254) TYP 90 aA 4 TYP a 0.030 A 0.015 (0.762 A 0.381) 0.100 A 0.010 (2.540 A 0.254) TYP 95 aA 5 a 0.008-0.016 TYP (0.203-0.406) 0.280 (7.112) MIN +0.040 0.325 -0.015 +1.016 N1RE(REV F) 8.255 -0.381 STC3232E Datasheet Rev.0.1, Dec.2005 Page 7 of 7 |
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