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TCM1520A RING DETECTOR
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
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On-Chip 150-V Bridge Diode Configuration Reliable BIDFET Technology High Standby Impedance . . . 1 M 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 2 3 4
8 7 6 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 M or greater, which prevents TA SMALL OUTLINE PLASTIC DIP any interference with parallel off-hook telephones (D) (P) transmitting DTMF or voice frequencies. The - 40C to 85C 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 k to 7 k 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-s 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.
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.
Copyright (c) 1990, Texas Instruments Incorporated
POST OFFICE BOX 655303 POST OFFICE BOX 1443
* DALLAS, TEXAS 75265 * HOUSTON, TEXAS 77251-1443
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TCM1520A DUAL DIFFERENTIAL COMPARATORS
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
functional block diagram
AC INPUT 1 Ring-Signal Voltage Input Section High-Input Impedance/ Antitapping Section 5 BELL TAPPING SENSE 6.8 V 45 V 1A 200 8 k Current Sensor
AC INPUT
8 Transient Protection Section
Vref
6
C FILTER
Regulated Voltage Output Section 4 5-V Series Regulator 18 k 5-V OUTPUT
2 INVERTING OUTPUT
3 COMMON
7 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 s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mA Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40C to 105C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40C to 125C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C
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 D P TA = 25C POWER RATING 950 mW 1000 mW OPERATING FACTOR ABOVE TA = 25C 7.6 mW/C 8.0 mW/C TA = 85C POWER RATING 494 mW 520 mW
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443
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TCM1520A RING DETECTOR
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
recommended operating conditions
MIN Input voltage, VIrms (f = 15.3 Hz to 68 Hz) (see Note 2) Operating free-air temperature, TA 40 - 40 MAX 150 85 UNIT V C
NOTE 2: Input voltage is applied to AC INPUT (pins 1 and 8) through a series 2.2-k 10% resistor and a 0.47-F 10% capacitor. (see Figures 1, 4, and 5.)
electrical characteristics over recommended operating free-air temperature range, RL = open, C(fltr) = 10 F (unless otherwise noted)
detector section
PARAMETER V(BR) CEX VOL VIT + VIT - Vhys VI(on) VO ZI(off) Collector-emitter output breakdown voltage, INVERTING OUTPUT Low-level output voltage, INVERTING OUTPUT Positive-going input threshold voltage Negative-going input threshold voltage Hysteresis (VIT + - VIT -) Shunt voltage, C FILTER On-state input current, SCR Output voltage, 5-V OUTPUT Standby input impedance Impedance when ringing II(on) II(hold) On-state input current, SCR (see Note 4) Input holding current, SCR IID = 10 mA See Note 3 VID = 40 V, VIrms = 3 V, VIrms = 40 V, VIrms = 130 V, See Note 3 See Note 3 RL = 10 k f 20 kHz f = 16 Hz f = 20 Hz 55 100 38 50 4.25 1 30 20 110 6 TEST CONDITIONS VID 5 Vrms, VID = 25 Vrms, IO = 5 A IO = 1.6 mA 18 7 11 50 100 5.75 MIN 45 1 25 TYP MAX UNIT V V V V V V V V M k mA A
Operating current VID = 40 V, Output open 1 1.6 mA All characteristics are measured with a 2.2-k resistor and a 0.47-F capacitor connected at AC INPUT (pin 1) in series with the input signal, unless otherwise noted. All typical values are at TA = 25C. NOTES: 3. These parameters are measured using pulse techniques (tw 200 s, duty cycle 5%) with C FILTER grounded. 4. This is the input current required to turn on the SCR.
switching characteristics at 25C operating free-air temperature, f = 20 Hz (unless otherwise noted)
PARAMETER ton t( ff) (off) Turn-on time Turn-off Turn off time TEST CONDITIONS VIrms = 40 V VIrms = 40 V VIrms = 60 V to 150 V MIN TYP 100 175 300 MAX UNIT ms ms
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443
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TCM1520A RING DETECTOR
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
PARAMETER MEASUREMENT INFORMATION
0.47 F, 350 V 1 2.2 k VIrms = 40 V to 150 V VID 8 6 AC INPUT C FILTER COMMON 3 7 INVERTING OUTPUT 2 10 k TCM1520A AC INPUT 5-V OUTPUT 4 Output
10 F, 50 V
Figure 1. Switching Test Circuit
TYPICAL CHARACTERISTICS
CAPACITOR VOLTAGE (C FILTER) vs DIFFERENTIAL INPUT VOLTAGE (AC INPUT, PINS 1 AND 8)
18 TA = 25C 15 VO - Output Voltage - V Capacitor Voltage - V 5 6 TA = 25C
OUTPUT VOLTAGE (5-V OUTPUT) vs CAPACITOR VOLTAGE (C FILTER)
12 Comparator Switch Fires 9
4
3
6 6.8-V Zener Diode Starts to Conduct 3
2
1
Comparator Switch Fires
0
8
10
12
14
16
18
20
0
4
5
6
7
8
9
10
VID - Differential Input Voltage - V
Capacitor Voltage - V
Figure 2
Figure 3
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443
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TCM1520A RING DETECTOR
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
APPLICATION INFORMATION
C1 = 0.47 F, 350 V 1 VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz R1 = 2.2 k VID 8 6 AC INPUT C FILTER R2 = 2.2 k C2 = 10 F, 50 V COMMON 3 7 TCM1520A AC INPUT 5-V OUTPUT 4 To Isolated Output TIL181
Figure 4. Isolated Configuration
C1 = 0.47 F, 350 V 1 R1 = 2.2 k VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz VID 8 6 AC INPUT C FILTER COMMON 3 7 INVERTING 2 OUTPUT TCM1520A AC INPUT 5-V OUTPUT 4
10 k Output
C2 = 10 F, 50 V
Figure 5. Nonisolated Configuration
NOTE: See Table 1 for component functions. TABLE 1. COMPONENT FUNCTIONS COMPONENT R1 R2 C1 C2 Optocoupler Limits current into light-emitting diode. Blocks dc-battery voltage in standby and aids in filtering dial pulses. Smaller values of C1 improve tapping immunity. Stores energy from the ring signal to power the 5-V regulator. Provides ground and transient isolation between the host system and the telephone line. FUNCTION Limits current into SCR during high-voltage transients and aids in dial-pulse rejection.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443
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TCM1520A RING DETECTOR
SCTS005B - OCTOBER 1984 - REVISED DECEMBER 1990
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443
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Copyright (c) 1998, Texas Instruments Incorporated

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