TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 • • • • • • • On-Chip 150-V Bridge Diode Configuration Reliable BIDFET† Technology High Standby Impedance . . . 1 MΩ Typ Efficient High-Voltage Operation Output Compatible With TTL, NMOS, and CMOS Built-In 5-V Series Regulator Built-In Lightning and Transient Protection D OR P PACKAGE (TOP VIEW) AC INPUT INVERTING OUTPUT COMMON 5-V OUTPUT 1 8 2 7 3 6 4 5 AC INPUT COMMON C FILTER BELL TAPPING SENSE TCM1520A APPLICATION Phone Line AC Ring Signal description The TCM1520A is a monolithic ring-detection integrated circuit designed for use in isolated or nonisolated telephone applications. The device uses a modified form of the Texas Instruments BIDFET† technology to combine low-voltage CMOS and high-voltage bipolar input/output circuitry. It features efficient high-voltage (40 V to 150 V) operation with a typical current drain of 1 mA. TCM1520A Electronic Telephone or Accessory TTL /NMOS/CMOS Microprocessor AVAILABLE OPTIONS During standby, the input impedance is PACKAGE approximately 1 MΩ or greater, which prevents TA SMALL OUTLINE PLASTIC DIP any interference with parallel off-hook telephones (D)‡ (P) transmitting DTMF or voice frequencies. The – 40°C to 85°C TCM1520AD TCM1520AP device achieves this high input impedance with an ‡ The D package is available taped and reeled with suffix R on-chip series zener diode that does not conduct added to the device type (i.e., TCM1520ADR). until the voltage across AC INPUT (pins 1 and 8) exceeds 8 V. When the voltage across pins 1 and 8 exceeds 18 V, the internal switch is closed, which bypasses the 6.8-V zener diode series resistor. This allows more efficient power transfer to the load when the device is in the operating mode. In the operating mode, the impedance of the device varies from 30 kΩ to 7 kΩ over the ring signal of 40 V at 16 Hz to 150 V at 68 Hz and is reasonably independent of the output load. In typical telephone applications, the TCM1520A is activated through the telephone line by a ring voltage of 40 V at 16 Hz to 150 V at 68 Hz. The TCM1520A generates a signal suitable to drive an optocoupler or TTL, NMOS, or CMOS logic. The 5-V OUTPUT can be used as a supply source for optocouplers or low-power logic. This output is noninverting and is at a high level during ringing. The TCM1520A incorporates lightning and transient protection that is designed to withstand lightning strikes of 1.5-kV amplitude and 200-µs duration and also features built-in circuitry to avoid tapping or false triggering due to transients. Caution. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. † BIDFET – Bipolar, double-diffused, N-channel and P-channel MOS transistors on same chip. This is a patented process. Copyright 1990, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. • DALLAS, TEXAS 75265 • HOUSTON, TEXAS 77251–1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 1 TCM1520A DUAL DIFFERENTIAL COMPARATORS SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 functional block diagram AC INPUT AC INPUT 1 Ring-Signal Voltage Input Section High-Input Impedance/ Antitapping Section 5 BELL TAPPING SENSE 8 Transient Protection Section 6.8 V 45 V 200 Ω 1A 8 kΩ Current Sensor Vref 6 C FILTER Regulated Voltage Output Section 4 5-V Series Regulator 5-V OUTPUT 18 kΩ 2 INVERTING OUTPUT 3 7 COMMON COMMON absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Continuous supply voltage at C FILTER (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Continuous differential input voltage, VID (AC INPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Continuous output current at 5-V OUTPUT, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mA Continuous SCR on-state input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA SCR on-state input current, II(on) (duration ≤ 200 µs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mA Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 105°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 125°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C † 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 under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values, unless otherwise noted, are with respect to COMMON (pin 7). DISSIPATION RATING TABLE TA = 25°C POWER RATING OPERATING FACTOR ABOVE TA = 25°C TA = 85°C POWER RATING D 950 mW 7.6 mW/°C 494 mW P 1000 mW 8.0 mW/°C 520 mW PACKAGE 2 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 recommended operating conditions Input voltage, VIrms (f = 15.3 Hz to 68 Hz) (see Note 2) Operating free-air temperature, TA MIN MAX UNIT 40 150 V – 40 85 °C NOTE 2: Input voltage is applied to AC INPUT (pins 1 and 8) through a series 2.2-kΩ ± 10% resistor and a 0.47-µF ± 10% capacitor. (see Figures 1, 4, and 5.) electrical characteristics over recommended operating free-air temperature range, RL = open, C(fltr) = 10 µF (unless otherwise noted) detector section TEST CONDITIONS† PARAMETER Collector-emitter output breakdown voltage, INVERTING OUTPUT VID ≤ 5 Vrms, IO = 5 µA VOL VIT + Low-level output voltage, INVERTING OUTPUT VID = 25 Vrms, IO = 1.6 mA VIT – Vhys Negative-going input threshold voltage V(BR) CEX MIN 6 Hysteresis (VIT + – VIT –) On-state input current, SCR VO ZI(off) Output voltage, 5-V OUTPUT IID = 10 mA See Note 3 1 V 25 V 7 V 11 V 38 50 V 50 100 V VID = 40 V, VIrms = 3 V, RL = 10 kΩ f ≤ 20 kHz 1 Impedance when ringing VIrms = 40 V, VIrms = 130 V, f = 16 Hz 30 f = 20 Hz 20 II(on) On-state input current, SCR (see Note 4) See Note 3 55 II(hold) Input holding current, SCR See Note 3 100 Standby input impedance UNIT V 18 Shunt voltage, C FILTER MAX 45 Positive-going input threshold voltage VI(on) TYP‡ 4.25 5.75 V MΩ kΩ 110 mA µA Operating current VID = 40 V, Output open 1 1.6 mA † All characteristics are measured with a 2.2-kΩ resistor and a 0.47-µF capacitor connected at AC INPUT (pin 1) in series with the input signal, unless otherwise noted. ‡ All typical values are at TA = 25°C. NOTES: 3. These parameters are measured using pulse techniques (tw ≤ 200 µs, duty cycle ≤ 5%) with C FILTER grounded. 4. This is the input current required to turn on the SCR. switching characteristics at 25°C operating free-air temperature, f = 20 Hz (unless otherwise noted) PARAMETER ton t((off) ff) TEST CONDITIONS Turn-on time Turn off time Turn-off • TYP VIrms = 40 V VIrms = 40 V 100 VIrms = 60 V to 150 V 300 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • MIN 175 MAX UNIT ms ms 3 TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 PARAMETER MEASUREMENT INFORMATION 0.47 µF, 350 V TCM1520A AC INPUT 1 5-V OUTPUT 4 Output 2.2 kΩ VID VIrms = 40 V to 150 V 10 kΩ AC INPUT 8 6 INVERTING OUTPUT 2 C FILTER COMMON 10 µF, 50 V 3 7 Figure 1. Switching Test Circuit TYPICAL CHARACTERISTICS CAPACITOR VOLTAGE (C FILTER) vs DIFFERENTIAL INPUT VOLTAGE (AC INPUT, PINS 1 AND 8) OUTPUT VOLTAGE (5-V OUTPUT) vs CAPACITOR VOLTAGE (C FILTER) 18 6 TA = 25°C TA = 25°C 5 VO – Output Voltage – V Capacitor Voltage – V 15 12 Comparator Switch Fires 9 6 6.8-V Zener Diode Starts to Conduct 3 0 4 3 2 Comparator Switch Fires 1 8 10 12 14 16 18 0 20 4 5 VID – Differential Input Voltage – V Figure 2 4 6 7 8 Capacitor Voltage – V Figure 3 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 9 10 TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 APPLICATION INFORMATION C1 = 0.47 µF, 350 V TCM1520A 1 VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz R1 = 2.2 kΩ AC INPUT TIL181 5-V OUTPUT 4 To Isolated Output VID 8 6 AC INPUT C FILTER R2 = 2.2 kΩ COMMON C2 = 10 µF, 50 V 3 7 Figure 4. Isolated Configuration C1 = 0.47 µF, 350 V TCM1520A 1 R1 = 2.2 kΩ VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz AC INPUT 5-V OUTPUT 4 VID 10 kΩ 8 6 INVERTING 2 OUTPUT AC INPUT Output C FILTER COMMON C2 = 10 µF, 50 V 3 7 Figure 5. Nonisolated Configuration NOTE: See Table 1 for component functions. TABLE 1. COMPONENT FUNCTIONS COMPONENT FUNCTION R1 Limits current into SCR during high-voltage transients and aids in dial-pulse rejection. R2 Limits current into light-emitting diode. C1 Blocks dc-battery voltage in standby and aids in filtering dial pulses. Smaller values of C1 improve tapping immunity. C2 Stores energy from the ring signal to power the 5-V regulator. Optocoupler Provides ground and transient isolation between the host system and the telephone line. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 5 TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 6 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. 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