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| 1 TC232* *Patented DUAL RS-232 TRANSMITTER/RECEIVER AND POWER SUPPLY FEATURES s s s s s s s s Meets All RS-232 Specifications Operates From Single 5V Power Supply 2 Drivers and 2 Receivers On-Board Voltage Quadrupler Input Levels ...................................................... 30V Output Swing With +5V Supply ........................ 9V Low Supply Current ........................................ 5 mA Does not require external 12V supplies GENERAL DESCRIPTION The TC232 is a dual RS-232 transmitter/receiver that complies with EIA /TIA RS-232E guidelines and is ideal for all RS-232 communication links. This device operates from a 5V power supply and contains two charge pump voltage converters that produce 10V power supplies. The TC232 has four level translators. Two are RS-232 transmitters that convert TTL/CMOS input levels to 9V RS-232 outputs. The other two translators are RS-232 receivers that convert RS-232 inputs to 5V TTL/CMOS output levels. The receivers have a nominal threshold of 1.3V, a typical hysteresis of 0.5V, and can operate with inputs up to 30V. 2 3 4 APPLICATIONS s s s RS-232C Communication Links Modems, peripherals, computers Battery-powered systems PIN CONFIGURATIONS (DIP AND SOIC) + C1 1 +2 - C1 3 + C2 4 - C2 5 V- 6 16 VCC 15 GND 14 T1OUT 13 R1 IN + C1 1 +2 - C1 3 + C2 4 - C2 5 V- 6 16 VCC 15 GND 14 T1OUT 13 R1 IN ORDERING INFORMATION Part No. TC232COE TC232CPE TC232EOE TC232EPE TC232IJE TC232MJE Package 16-Pin SOIC (Wide) 16-Pin Plastic DIP 16-Pin SOIC (Wide) 16-Pin Plastic DIP 16-Pin CerDIP 16-Pin CerDIP Temp. Range 0C to +70C 0C to +70C - 40C to +85C - 40C to +85C - 25C to +85C - 55C to +125C V V T2 OUT 7 R2 IN 8 TC232CPE TC232EPE TC232IJE TC232MJE 12 R1OUT 11 T1 IN 10 T2 IN 9 R2 OUT TC232COE TC232EOE 12 R1OUT 11 T1 IN 10 T2 IN 9 R2 OUT T2 OUT 7 R2 IN 8 5 6 TYPICAL APPLICATION +5V INPUT + 16 1 C1 + 10 F C2 + 10 F + C1 3- C1 4+ C2 5- C2 +5V 400 k 11 T1IN +5V TTL/CMOS INPUTS 10 T2IN 400 k T2 T2OUT 7 T1 T1OUT 14 RS-232 OUTPUTS VCC +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER V+ V- 2 +10V -10V 6 + C4 10 F + C3* 10 F C3* 10 F + 10 F 7 12 R1OUT TTL/CMOS OUTPUTS 9 R2OUT R1 R1IN 13 5 k RS-232 INPUTS R2 R2IN 8 5 k GND *NOTE: C3 can be connected between V+ and VCC for convenience. 15 8 TC232-6 10/21/96 TELCOM SEMICONDUCTOR, INC. 6-3 DUAL RS-232 TRANSMITTER/ RECEIVER AND POWER SUPPLY TC232 ABSOLUTE MAXIMUM RATINGS* VCC ............................................................................. +6V V+ ........................................................................... +12V V- ........................................................................... +12V Input Voltages T1IN, T2IN .................................... -0.3 to (VCC +0.3V) R1IN, R2IN ......................................................... 30V Output Voltages T1OUT, T2OUT ...................... (V+ +0.3V) to (V- -0.3V) R1OUT, R2OUT .............................. -0.3 to (VCC +0.3V) Short Circuit Duration V+ .................................................................... 30sec V- .................................................................... 30sec T1OUT, T2OUT .......................................... Continuous Storage Temperature Range .................. -65C to +150C Package Power Dissipation (TA 70C) CerDIP ............................................................890mW Derate 9.5 mW/C Above +70C Plastic DIP ...................................................... 840mW Derate 7 mW/C Above +70C Small Outline (SOIC) ...................................... 760mW Derate 7 mW/C Above +70C *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above 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 above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: VCC = 5V 10%, TA = operating temperature range, test circuit unless otherwise noted. Parameter Output Voltage Swing Power Supply Current Input Logic Threshold Low Input Logic Threshold High Logic Pull-Up Current RS-232 Input Voltage Operating Range RS-232 Input Threshold Low RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance TTL/CMOS Output Voltage Low TTL/CMOS Output Voltage High Propagation Delay Instantaneous Slew Rate Transition Region Slew Rate Test Conditions T1OUT, T2OUT Loaded With 3 k to Ground T1IN, T2IN T1IN, T2IN T1IN, T2IN = 0V VCC = 5V VCC = 5V TA = +25C, VCC = 5V IOUT = 3.2 mA IOUT = - 1 mA RS-232 to TTL or TTL to RS-232 CL = 10 pF, RL = 3 k to 7 k, TA = +25C (Note 1) RL = 3 k, CL = 2500 pF Measured From +3V to - 3V or -3V to +3V VCC = V+ = V- = 0V, VOUT = 2V Min 5 -- -- 2 -- - 30 0.8 -- 0.2 3 -- 3.5 -- -- -- Typ 9 5 -- -- 15 -- 1.2 1.7 0.5 5 -- -- 0.5 -- 3 Max 10 10 0.8 -- 200 +30 -- 2.4 1 7 0.4 -- -- 30 -- Unit V mA V V A V V V V k V V sec V/sec V/sec Output Resistance RS-232 Output Short-Circuit Current NOTE 1. Sample tested. 300 -- -- 10 -- -- mA 6-4 TELCOM SEMICONDUCTOR, INC. DUAL RS-232 TRANSMITTER/ RECEIVER AND POWER SUPPLY TC232 DETAILED DESCRIPTION The TC232 contains a +5V to 10V dual charge pump voltage converter, a dual transmitter and a dual receiver. OUTPUT VOLTAGE (|V|) 1 V+, V- Output Voltages vs Load Current 10 9 8 7 6 5 CONDITIONS: 4 A) TA = +25C B) TRANSMITTER OUTPUTS OPEN CIRCUIT 3 0 12345678 |I | (mA) LOAD V- (VCC = 4.5V) V+ (VCC = 4.5V) 2 V+ (VCC = 5V) +5V to 10V Dual Charge Pump Voltage Converter The TC232 power supply consists of two charge pumps. One uses external capacitor C1 to double the +5V input to +10V, with output impedance of about 200. The other uses C2 to invert +10V to - 10V, with overall output impedance of 450 (including effects of +5V to +10V doubler impedance). The clock in the doubler circuit will start at 4.2V in the typical part, but external loads may make this point rise to as high as 4.5V with a load of 2 k on each of the two output voltages. Because of this, use of the doubler and inverter to run additional external circuits should be limited. The maximum current should be no more than 2.5 mA from the +10V and - 10V. in order to guarantee start-up of the doubler clock. The test circuit employs 22 F capacitors for C1 to C4, but the value is not critical. These capacitors usually are lowcost aluminum or tantalum electrolytic capacitors. Increasing C1 and C2 to 47 F lowers the output impedance of the +10V doubler and the - 10V inverter by the change in the ESR of the capacitors. Increasing C3 and C4 lowers ripple on the 10V outputs and 16 kHz ripple on the RS-232 outputs. Where size is critical, the value of C1 to C4 can be lowered to 1 F. The use of a low ESR capacitor will help lower the output ripple and keep the output impedance of the 10V as low as possible. V- (VCC = 5V) 3 10 9 4 5 6 The outputs are protected and can be short-circuited to ground indefinitely. Dual Receiver TC232 receivers meet RS-232 input specifications. Input impedance is between 3 k and 7 k. Switching thresholds are within the 3V limits, and the receivers withstand up to 30V inputs. RS-232 and TTL/CMOS input compatible, the receivers have 0.8V VIL and 2.4V VIH with 0.5V hysteresis to reject noise. The TTL/CMOS compatible receiver output is LOW when an RS-232 input is greater than 2.4V. It is HIGH when an input is floating or between +0.8V and - 30V. TEST CIRCUIT +4.5V TO +5.5V INPUT V CC 16 GND 15 3 k T1OUT 14 R1IN 13 R1OUT 12 T1 IN 11 T2 IN 10 R2OUT 9 RS-232 OUTPUT RS-232 INPUT 30V TTL/CMOS OUTPUT TTL/CMOS INPUT TTL/CMOS INPUT TTL/CMOS OUTPUT Dual Transmitter TC232 transmitters are CMOS inverters driven by 10V internally-generated voltages. The input is TTL/CMOS compatible, with a logic threshold of about 26% of VCC (1.3V for 5V VCC). The input of an unused transmitter can be left unconnected, since an internal 400 k pull-up resistor connected between the transmitter input and VCC pulls the input HIGH and forces the unused transmitter output to the LOW state. With VCC at 5V, the outputs will go from (V+ - 0.6V) to V- with no load and will swing 9V when loaded with 3 k. The minimum output voltage swing, with VCC at 4.5V and at maximum ambient temperature, is 5V. This conforms to RS-232 specifications for "worst-case" conditions. EIA/TIA RS-232E specs limit the slew rate at output to less than 30V/s. The powered-down output impedance (VCC = 0V) is a minimum of 300 with 2V applied to outputs. TELCOM SEMICONDUCTOR, INC. TC232 1 C1 + 22 F 22 F + C3 3 C2 22 F + 4 5 6 7 3 k 8 RS-232 INPUT 30V R2 IN 2 + C1 V+ - C1 + C2 - C2 V- T2 OUT 7 + RS-232 OUTPUT C4 22 F 8 6-5 |
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