Texas Instruments TCM1520AP, TCM1520AD Datasheet

TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
On-Chip 150-V Bridge Diode Configuration
Reliable BIDFET
T echnology
High Standby Impedance...1 M Typ
Efficient High-Voltage Operation
Output Compatible With TTL, NMOS, and
CMOS
AC INPUT
INVERTING OUTPUT
COMMON
5-V OUTPUT
D OR P PACKAGE
(TOP VIEW)
1 2 3 4
8 7 6 5
AC INPUT COMMON C FILTER BELL T APPING SENSE
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 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 M 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 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.
technology to combine low-voltage
The D package is available taped and reeled with suffix R added to the device type (i.e., TCM1520ADR).
TCM1520A APPLICATION
Phone Line
TCM1520A
Electronic Telephone
or Accessory
TTL/NMOS/CMOS
Microprocessor
AVAILABLE OPTIONS
T
A
SMALL OUTLINE
TCM1520AD TCM1520AP–40°C to 85°C
AC Ring
Signal
(D)
PACKAGE
PLASTIC DIP
(P)
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.
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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443
Copyright 1990, Texas Instruments Incorporated
1
TCM1520A DUAL DIFFERENTIAL COMPARATORS
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
functional block diagram
AC INPUT
AC INPUT
1
8
Transient
Protection
Section
Ring-Signal
Voltage Input
Section
45 V 1A
Current
Sensor
Output Section
Regulated
Voltage
V
ref
5-V Series
Regulator
High-Input Impedance/
Antitapping Section
6.8 V
200
8 k
18 k
5
BELL TAPPING SENSE
6
C FILTER
4
5-V OUTPUT
2
INVERTING OUTPUT
37
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, V Continuous output current at 5-V OUTPUT, I
Continuous SCR on-state input current 200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCR on-state input current, I
(duration 200 µs) 900 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I(on)
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
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).
PACKAGE
D 950 mW 7.6 mW/°C 494 mW P 1000 mW 8.0 mW/°C 520 mW
POWER RATING
(AC INPUT) 40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ID
DISSIPATION RATING TABLE
TA = 25°C
12 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
–40°C to 105°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
OPERATING FACTOR
ABOVE TA = 25°C
TA = 85°C
POWER RATING
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443
TCM1520A
Impedance when ringing
k
t
Turn-off time
ms
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
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, T
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-µF ±10% capacitor. (see
Figures 1, 4, and 5.)
A
electrical characteristics over recommended operating free-air temperature range, RL = open, C
= 10 µF (unless otherwise noted)
(fltr)
detector section
PARAMETER
V
(BR) CEX
V
OL
V
IT+
V
IT–
V
hys
V
I(on)
V
O
Z
I(off)
I
I(on)
I
I(hold)
All characteristics are measured with a 2.2-k 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.
Collector-emitter output breakdown voltage, INVERTING OUTPUT
Low-level output voltage, INVERTING OUTPUT VID = 25 Vrms, IO = 1.6 mA 1 V Positive-going input threshold voltage 18 25 V Negative-going input threshold voltage 6 7 V Hysteresis (V Shunt voltage, C FILTER IID = 10 mA 38 50 V On-state input current, SCR See Note 3 50 100 V Output voltage, 5-V OUTPUT VID = 40 V, RL = 10 k 4.25 5.75 V Standby input impedance VIrms = 3 V, f 20 kHz 1 M
p
On-state input current, SCR (see Note 4) Input holding current, SCR See Note 3 100 µA Operating current VID = 40 V, Output open 1 1.6 mA
4. This is the input current required to turn on the SCR.
IT+
– V
) 11 V
IT–
TEST CONDITIONS
VID 5 Vrms, IO = 5 µA 45 V
VIrms = 40 V, f = 16 Hz 30 VIrms = 130 V, f = 20 Hz 20 See Note 3 55 110 mA
MIN
–40 85 °C
TYP
MAX UNIT
switching characteristics at 25°C operating free-air temperature, f = 20 Hz (unless otherwise noted)
t
on
(off)
PARAMETER
Turn-on time VIrms = 40 V 100 ms
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443
TEST CONDITIONS
VIrms = 40 V 175 VIrms = 60 V to 150 V 300
MIN
TYP
MAX UNIT
3
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