www.clare.com ds-M-949-01-r1.0 1 M-949-01 line sense relay part # description m-949-11 line sense relay features description ordering information figure 1 electrical configuration 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, the M-949-01 line sense relay is a small pwb- mount loop current detector with the safety andreliability 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?ff-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 2 typical application: dialed digit monitor
www.clare.com 2 M-949-01 rev. 1.0 absolute maximum ratings are stress ratings. stresses in excess of these ratings can cause permanent damage tothe device. functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied. specifications parameter conditions min max units notes dual coils pick up current 0 o to 70 o c ambient 18 - ma 1 drop out current 0 o to 70 o c ambient - 6 ma 1 coil current 20 o c ambient - 125 ma 2 coil resistance - - 20 ohms - coil inductance - - 4 mh 3 longitudinal balance - 63 - db 4 excitation to closure time (including bounce) - - 1 ms 5 excitation removal to open time - - 0.5 ms - relay contact voltage rating - 200 - vdc - current rating - 500 - ma - power (resistive) rating - 10 - w - rated life - 10 7 - operations 6 dielectric strength open contacts - 300 - vdc - coil to coil - 1000 - vdc - coil to contact - 1500 - vdc - ambient operating 85% rh 0 70 c- temperature non-operating 95% rh -20 70 c- 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. absolute maximum ratings* tolerance inches metric min max min max a - 1.20 - 30.50 b - 0.41 - 10.40 c 0.345 0.375 8.76 9.53 d 0.125 0.140 3.18 3.56 e 0.016 typ. 0.41 typ. f 0.021 0.031 0.53 0.79 g 0.10 ref. 2.5 ref. h 0.10 typ. 2.5 ref. i 0.985 1.015 25.02 25.78
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 clares 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 clares 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 ?opyright 2003, clare, inc.all rights reserved. printed in usa. 5/6/03 for additional information please visit our website at: www.clare.com mechanical dimensions dimensions mm (inches)
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