TCM1520AP

TCM1520A TI | Alldatasheet

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SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 Copyright  1990, Texas Instruments Incorporated 1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443

• 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

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. During standby, the input impedance is approximately 1 MΩ or greater, which prevents any interference with parallel off-hook telephones transmitting DTMF or voice frequencies. The device achieves this high input impedance with an on-chip series zener diode that does not conduct 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. AC INPUT INVERTING OUTPUT COMMON 5-V OUTPUT AC INPUT COMMON C FILTER BELL TAPPING SENSE D OR P PACKAGE (TOP VIEW) TCM1520A APPLICATION Phone Line AC Ring Signal TCM1520A Electronic Telephone or Accessory TTL/NMOS/CMOS Microprocessor AVAILABLE OPTIONS PACKAGE SMALL OUTLINE (D)‡ PLASTIC DIP (P) TCM1520AD TCM1520AP–40°C to 85°C TA ‡ The D package is available taped and reeled with suffix R added to the device type (i.e., TCM1520ADR). 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.

DUAL DIFFERENTIAL COMPARATORS SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990

2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 functional block diagram Current Sensor Ring-Signal Voltage Input Section Vref 200 Ω 6.8 V 8 kΩ 5-V Series Regulator 18 kΩ Transient Protection Section

45 V 1A

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† † 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 PACKAGE TA = 25°C POWER RATING OPERATING FACTOR ABOVE T A = 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

SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 recommended operating conditions MIN MAX UNIT Input voltage, VIrms (f = 15.3 Hz to 68 Hz) (see Note 2) 40 150 V Operating free-air temperature, TA –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 PARAMETER TEST CONDITIONS † MIN TYP ‡ MAX UNIT V(BR) CEX Collector-emitter output breakdown voltage, INVERTING OUTPUT VID ≤ 5 Vrms, IO = 5 µA 45 V VOL Low-level output voltage, INVERTING OUTPUT VID = 25 Vrms, IO = 1.6 mA 1 V VIT+ Positive-going input threshold voltage 18 25 V VIT– Negative-going input threshold voltage 6 7 V Vhys Hysteresis (VIT+ – VIT–) 11 V Shunt voltage, C FILTER IID = 10 mA 38 50 V VI(on) On-state input current, SCR See Note 3 50 100 V VO Output voltage, 5-V OUTPUT VID = 40 V, R L = 10 kΩ 4.25 5.75 V ZI(off) Standby input impedance VIrms = 3 V, f ≤ 20 kHz 1 M Ω Impedance when ringing VIrms = 40 V, f = 16 Hz 30 kΩImpedance when ringing VIrms = 130 V, f = 20 Hz 20 kΩ II(on) On-state input current, SCR (see Note 4) See Note 3 55 110 mA II(hold) Input holding current, SCR See Note 3 100 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 TEST CONDITIONS MIN TYP MAX UNIT ton Turn-on time VIrms = 40 V 100 ms t(f f )Turn off time VIrms = 40 V 175 mst(off) Turn-off time VIrms = 60 V to 150 V 300 ms

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Figure 1. Switching Test Circuit

SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443

APPLICATION INFORMATION

C2 = 10 µF, 50 V R1 = 2.2 kΩ VIrms = 40 V to 150 V,

15.3 Hz to 68 Hz

R2 = 2.2 kΩ VID C1 = 0.47 µF,

350 V TIL181

Figure 4. Isolated Configuration

15.3 Hz to 68 Hz 10 kΩVID

Figure 5. Nonisolated Configuration NOTE: See Table 1 for component functions. TABLE 1. COMPONENT FUNCTIONS R1 Limits current into SCR during high-voltage transients and aids in dial-pulse rejection. R2 Limits current into light-emitting diode. 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.

SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990

6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443

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