M-949-01 Line Sense Relay Features • Senses telephone line current from 18 to 125mA • Includes 1 Form A relay contact • Maximum closure time 1 ms including bounce • Achives 63 dB minimum longitudinal balance • Provides 1500 VDC coil-to-contact isolation • Improved RFI shielding • UL Recognized • Applications include: central office products, PBX and key systems, rotary dial monitoring devices, Description The M-949-01 Line Sense relay is a small PWBmount loop current detector with the safety and reliability features required for FCC Part 68 regulated telephone applicatoins. When connected to the voice pair (Tip and Ring of an ordinary telephone line, the M-949-01 provides a 1 Form A relay closure in response to current above 20mA flowing hrough the wires. This closure can be used by control circuitry for on-hook’off-hook monitoring, switchhook flash detection, and rotary dial pulse counting. Simple in design and rugged in construction, the M-949-01 is ideally suited for use with the Teltone M-959, M-8870, M-8880, M-8888, and other loop current controlled telephone dialing recievers. Figure 1 Electrical Configuration Ordering Information Part # M-949-11 Description Line Sense Relay Figure 2 Typical Application: Dialed Digit Monitor DS-M-949-01-R1.0 www.clare.com 1 M-949-01 Absolute Maximum Ratings* Tolerance Inches A B C D E F G H I Min 0.345 0.125 Metric Max 1.20 0.41 0.375 0.140 Min 8.76 3.18 0.016 typ. 0.021 0.41 typ. 0.031 0.53 0.10 ref. 0.10 typ. 0.985 Max 30.50 10.40 9.53 3.56 Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied. 0.79 2.5 ref. 2.5 ref. 1.015 25.02 25.78 Specifications Dual Coils Relay Contact Dielectric Strength Ambient Temperature Parameter Pick Up Current Drop Out Current Coil Current Coil Resistance Coil Inductance Longitudinal Balance Excitation to Closure Time (Including Bounce) Excitation Removal to Open Time Voltage Rating Current Rating Power (Resistive) Rating Rated Life Open Contacts Coil to Coil Coil to Contact Operating Non-operating Conditions 0o to 70oC ambient 0o to 70oC ambient 20oC ambient - Min 18 63 Max 6 125 20 4 - Units mA mA mA ohms mH dB Notes 1 1 2 3 4 85% RH 95% RH 200 500 10 107 300 1000 1500 0 -20 1 0.5 70 70 ms ms VDC mA W operations VDC VDC VDC ºC ºC 5 6 - Notes: 1. With coils in series-aiding configuration. 2. With the current continuously applied. 3. At 1 kHz. 4. With current of 20-100mA at 200-3000 kHz. 5. With current of 20mA and coils series-aiding configuration. 6. At 10W (resistive.) 7. Maximum initial contact resistance ≤ 1.0ohms. 2 www.clare.com Rev. 1.0 MECHANICAL DIMENSIONS Dimensions mm (inches) For additional information please visit our website at: www.clare.com Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in Clare’s Standard Terms and Conditions of Sale, Clare, Inc. assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to discontinue or make changes to its products at any time without notice. Specification: DS-M949-01-R1.0 ©Copyright 2003, Clare, Inc. All rights reserved. Printed in USA. 5/6/03