99W121A Call Progress Tone Decoder for Telephone BU8877/F Description The BU8877 and BU8877F are ICs that detect dial tones from a call progress signal used in the telephone lines. The ICs detect dual signals 350Hz(from 345 to 355Hz)and 440Hz(from 435 to 445Hz). Dimension(Units:mm) BU8877 Features 1) No malfunction by voice signal 2) Dual tone detection (350Hz and 440Hz) 3) Wide dynamic range 4) 3.58MHz crystal resonator DIP8 BU8877F Applications Telephone, Codeless telephone and Facsimile for the U.S. SOP16 Absolute Maximum Ratings (Ta=25˚C) Parameter Power supply voltage Power dissipation DIP8 SOP16 Symbol Limits VCC 7 800 Pd 300 Unit V *1 *2 mW Operating temperature range Topr -30 ~ +80 ˚C Storage temperature range Tstg -55 ~ +125 ˚C *1 Derating:8.0mW/˚C for operation above Ta=25˚C *2 Derating:3.0mW/˚C for operation above Ta=25˚C Recommended Operating Conditions (Ta=25˚C) Parameter Power supply voltage Symbol Min. Typ. Max. Unit VDD 2.85 - 5.25 V December, 1999 Electrical characteristics (Unless otherwise noted, Ta=25˚C, VDD= 5.0V, Xtal frequency=3.58MHz) Parameter Symbol Supply current operation 2-1 Min. Typ. Max. Unit Conditions ENABLE="H"(VDD=5.0V) Input frequency: Must detect frequency range VRECL, VRECH are proportional to VDD. IDD2-1 - 3.7 5.0 mA Minimum input signal level Maximum input signal level VRECL -38 - - dBm VRECH - - 2 dBm Must not detect signal level VREJ -50 - - dBm 350Hz fV350 345 350 355 Hz 440Hz fV440 435 440 445 Must detect frequency range Input Impedance Call progress tone response time Call pogress tone de-response time Detect duty ratio * Zin - 100 - Hz kΩ tRES tDRES 28 - 56 ms 28 - 56 ms WDU 35 50 65 % Input signal level: 0dBm Input frequency: 100Hz~2000Hz *Detect Duty Ratio which input signal (350Hz+440Hz) burst at 5Hz (Duty Ratio=50%) Block Diagram VDD VDD VSS VSS ENABLE ENABLE BPF (350Hz) INPUT AGC Timer AAF BPF (440Hz) XIN OSC XOUT Comparator CLOCK GENERATOR DETECT Comparator CLOCK VREF BU8877/F VREF Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix1-Rev1.0