SLS SL2418D, SL2418N Datasheet

SL2418

System Logic

Semiconductor

SLS

Telephone Tone Ringer with Bridge Diode

The SL2418 is a monolithic integrated circuit telephone tone ringer
with bridge diode, when coupled with an appropriate transducer, it
replaces the electro-mechanical bell. The device is designed for use
with either a piezo transducer or an inexpensive transformer coupled
speaker to produce a pleasing tone composed of a high frequency (fR)
alternating with a low frequency (fL) resulting in a warble frequency.
The supply voltage is obtained from the AC ring signal and the circuit
is designed so that noise on the line or variation of the ringing signal
can not affect correct operation of the device.

• On chip high voltage full wave diode bridge rectifier

• Low current consumption, in order to allow the parallel operation

of the 4 devices

• Low external component count

• Tone and switching frequencies adjustable by external

components

• High noise immunity due to built-in voltage-current hysteresis

• Activation voltage adjustable

• Internal zener diodes to protect against over voltages

• Ringer impedance adjustable with external components

ORDERING INFORMATION

SL2418N Plastic

SL2418D SOIC

TA = -20° to 70° C

for package

PIN ASSIGNMENT

BLOCK DIAGRAM

SL2418

System Logic

Semiconductor

SLS

MAXIMUM RATINGS* (TA = 25°C)

Symbol Parameter Value Unit

VTP Calling Voltage (f = 50 Hz) Continuous 120 Vrms
VTP Calling Voltage (f = 50 Hz) 5 Sec ON/10 Sec OFF 200 Vrms

ICC Supply Current 22 mA

Tstg Storage and Junction Temperature -65 to +150 °C

*

Maximum Ratings are those values beyond which damage to the device may occur.

Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Max Unit

VCC Supply Voltage 26 V

TA Operating Temperatur e -20 +70 °C

This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, VIN and V

OUT

should be constrained to the range

GND≤(VIN or V

OUT

)≤VCC.

Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.

ELECTRICAL CHARACTERISTICS(T

A

= 25°C)

Symbol

Parameter

Test Conditions

Guaranteed Limits

Unit

Min Typ Max

ICC Current Consumption without

Load

VS=8.8 to 26 V 1.8 mA

VON Activiation Voltage 12.2 13 V

V

ONR

Activiation Voltage Range RA = 1 KΩ 8 10 V

V

SUS

Sustaining Voltage 8 8.8 V

RD Differential Resistance in Off

Condition

6.4 KΩ

V

OUT

Output Voltage Swing VCC-3 V

I

OUT

Short Circuit Current VS = 26 V 35 mA