STC3232E

STC3232E ETC1 | Alldatasheet

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Features

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Notebook, Sub notebook, and Palmtop Computers Battery-Powered / Hand-Held Equipment POS terminal / Intelligent Network Switch DMM / Printers Smart Phones xDSL Modems 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 stag e 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 0.1µF capacitors for operation from a +3.3V 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. 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/µs Max Slew Rate BiCMOS Technology PART TEMP. RANGE PIN-PACKAGE STC3232EESE -40°C to +85°C 16 Narrow SO STC3232EEPE -40°C to +85°C 16 Plastic DIP

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com Pin Configurations Absolute Maximum Ratings 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 spec ifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Input Voltages Output Voltages Continuous Power Dissipation (TA = +70°C) 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) … … … … 842mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C) … … … … 696mW Operating Temperature Ranges Storage Temperature Range … … … … … … … … … -65°C to +165°C Lead Temperature (soldering, 10sec) … … … … … … … … … +300°C C1+ 1 16Vcc V+ 2 15GND C1- 3 14T1OUT C2+ 4 13R1IN C2- 5 12R1OUT V- 6 11T1IN T2OUT 7 10T2IN R2IN 8 9 R2OUT DIP/SO STC3232E

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com

Electrical Characteristics

(VCC = +3V to +5.5V, C1-C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = +3.3V OR +5.5V, TA = +25°C ) VCC Supply Current ICC /SHDN = VCC , No Load, TA = +25°C 0.3 1 mA Shutdown Supply Current ISHDN /SHDN = GND, No Load, TA = +25°C 1 10 µA LOGIC Input Leakage Current T_IN, /SHDN, /EN ±1 µA Input Threshold Low VIL T_IN, /SHDN, /EN 0.8 V Input Threshold High VIH T_IN, /SHDN, /EN 2.0 V Output Voltage Low VOH R_OUT; IOUT = 3.2mA 0.4 V Output Voltage High VOL R_OUT; IOUT = -1.0mA VCC-0.6 VCC -0.1 V EIA/TIA-232E RECEIVER INPUTS Input Voltage Range -25 25 V Input Threshold Low TA = +25°C, VCC = 3.3V 0.6 1.1 V Input Threshold High TA = +25°C, VCC = 3.3V 1.5 2. 4 V Input Hysteresis VCC = 3.3V 0.1 0.2 V Input Resistance TA = +25°C, VCC = 3.3V 3 5 7 kO EIA/TIA-232E TRANSMITTER OUTPUTS Output Voltage Swing All drivers loaded with 3kO to ground ±5 ±5.4 V Output Resistance 300 500 O Output Short Circuit Current ±60 mA TIMING CHARACTERISTICS Maximum Data Rate RL = 3 kO to 7 kO, CL = 50pF to 1000pF, one transmitter switching 250 kbps Receiver Propagation Delay tPLHR, tPHLR CL= 150pF 0.15 µs Transmitter Propagation Delay tPLHT, tPHLT RL = 3 kO, CL = 2500pF, all transmitters loaded 0.1 µs Transition-Region Slew rate TA = +25°C, VCC = 3.3V RL = 3 kO to 7 kO, CL = 50pF to 1000pF, measured from -3V to +3V or +3V to -3V, 3 6 30 V/µs ESD & LATCH UP PERFORMANCE Human Body Model ±15 kV IEC1000-4-2, Contact Discharge ±8 kV ESD Protection Voltage IEC1000-4-2, Air-Gap Discharge ±15 kV Latch up Performance ±200 mA

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com Pin Descriptions Typical Operating Characteristics (VCC = +3V to +5.5V, C1-C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at T A = +25°C.) PIN (SO/DIP/SSOP) NAME FUNCTION — /EN Receiver Enable. Active low.

1 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor

2 V+ +5.5V Generated by the Charge Pump

3 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor

4 C2+ Positive Terminal of Inverting Charge-Pump Capacitor

5 C2- Negative Terminal of Inverting Charge-Pump Capacitor

6 V- -5.5V Generated by the Charge Pump 7, 14 T_OUT RS-232 Transmitter Outputs 8, 13 R_IN RS-232 Receiver Inputs 9, 12 R_OUT TTL/CMOS Receiver Outputs 10, 11 T_IN TTL/CMOS Transmitter Inputs

15 GND Ground

16 VCC +3.0V to +5.5V Supply Voltage 0 10002000300040005000 LOAD CAPACITANCE(pF) TRANSMITTER OUTPUT VOLTAGE VS.LOAD CAPACITANCE TRANSMITTER OUTPUT VOLTAGE(V) SLEW RATE(V/uS) 0 10002000300040005000 LOAD CAPACITANCE（pF） SLEW RATE VS.LOAD CAPACITANCE SUPPLY CLRRENT (mA） 0 10002000300040005000 LOAD CAPACITANCE（pF） OPERATION SUPPLY CURRENT VS.LOAD CAPACITANCE

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com Typical Operating Circuits Detailed Description Dual Charge-Pump Voltage Converter RS-232 Transmitters RS-232 Receivers The STC3232E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (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. The transmitters are inverting lev el translators that convert TTL/CMOS -logic levels to ±5V EIA/TIA -232 compliant 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. 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. +3.3V C1+ C1- C2+ C2- Vcc V+ STC3232E T1IN T1OUT11 14 T2IN T2OUT10 7 R1OUT R1IN12 13 R2OUT R2IN9 8 GND OBYPASS

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com Applications Information Capacitor Selection Power-Supply Decoupling Operation Down to 2.7V Interconnection with 3V and 5V Logic Pin Configurations and Typical Operating Circuits The capacitor type used for C1– C4 is not critical for proper operation; polarized or non-polarized capacitors can be used. reduces ripple on the transmitter outputs and slightly reduce s power consumption. C2, C3, and C4 can be increased without changing C1’s value. When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nomin al 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. n most circumstances, a 0.1µF VCC bypass capacitor is adequate. In applications sensitive to power -supply noise, use a capacitor of the same value as charge pump capacitor C1. Connect bypass capacitors as close to the IC as possible. Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V. The STC3232E can directly interface with various 3V and 5V logic families, including ACT and HCT CMOS. C1+ 1 16Vcc STC3232E V+ 2 15GND C1- 3 14T1OUT C2+ 4 13R1IN C2- 5 12R1OUT V- 6 11T1IN T2OUT 7 10V2IN R2IN 8 9R2OUT DIP/SO 5C2 C3Vcc C1+ C1- C2+ C2- Vcc STC3232E Vcc 200KΩ TTL/CMOS INPUTS T1IN T2IN +5V 200KΩ T1OUT T2OUT RS-232 OUTPUTS TTL/CMOS OUTPUTS R1OUT R2OUT R1IN 5KΩ R2IN RS-232 INPUTS 5KΩ GND TOP VIEW

STC3232E Datasheet Rev.0.1, Dec.2005 Page of 7 STC International Limited http://www.mcu-memory.com Physical Dimensions Inches (millimeters)unless otherwise noted 1 2 3 4 5 6 7 8 161514131211109 0.010 0.254MAX 0.386-0.394 (9.804-10.00) 0.228-0.244 (5.791-6.198) LEAD NO.1 IDENT 30° TYP 0.150-0.157 (3.810-3.988) 0.010-0.020 (0.254-0.508)×45° 0.008-0.010 (0.203-0.254) TYP ALL LEADS 0.016-0.050 (0.406-1.270) TYP ALL LEADS 8°MAX TYP ALL LEADS 15 14 13 12 11 10 916 2 3 4 5 6 7 81 0.740-0.780 (2.286) 0.250±0.010 (6.350±0.254) PIN NO.1 IDENT OPTION 01 0.060 (1.524) TYP 0.130±0.005 (3.302±0.127) 0.145-0.200 (3.683-5.080) 0.020 (0.508) MIN 0.125-0.150 (3.175-3.810) 0.014-0.023 (0.356-0.584) TYP 0.050±0.010 (1.270±0.254) TYP 0.100±0.010 (2.540±0.254) TYP 0.030±0.015 (0.762±0.381) 90°±4°TYP 4°TYP OPTIONAL 15 14 13 12 11 10 916 2 3 4 5 6 7 81 PIN NO.1 IDENT INDEX AREA OPTION 02 0.300-0.320 (7.620-8.128) 0.065 (1.651) 0.008-0.016 (0.203-0.406)TYP N1RE(REV F) 0.280 (7.112) MIN 95°± 5° 0.325+0.040 -0.015 8.255+1.016 -0.381 0.053-0.069 (1.345-1.753) 0.014 (0.356) 0.050 (1.270) TYP 0.008 (0.203)TYP 0.014-0.020 (0.356-0.508)TYP 0.004-0.010 (0.102-0.254) SENTING PLANE