M-8888

M-8888 DTMF Transceiver Features CMOS technology for low power con· Advanced sumption and increased noise immunity DTMF transmitter/receiver in a single · Complete chip Standard 8051, 8086/8 microprocessor port · Central office quality and performance · Adjustable guard time · Automatic tone burst mode · Call progress mode · Single +5 Volt power supply · 20-pin DIP and SOIC packages · 2 MHz microprocessor port operation · · Inexpensive 3.58 MHz crystal Applications Paging systems · Repeater systems/mobile radio · Interconnect dialers · PBX systems · Computer systems · Fax machines · Pay telephone · · Credit card verification Description The M-8888 is a complete DTMF Transmitter Receiver that features adjustable guard time, automatic tone burst mode, call progress mode, and a fully compatible 8051, 8086/8 microprocessor interface. The receiver portion is based on the industry standard M-8870 DTMF Receiver, while the transmitter uses a switched-capacitor digital-to-analog converter for lowdistortion, highly accurate DTMF signaling. Tone bursts can be transmitted with precise timing by making use of the automatic tone burst mode. To analyze call progress tones, a call progress filter can be selected by an external microprocessor. Ordering Information Part # Description M-8888-01P M-8888-01SM M-8888-01T 20-pin plastic DIP 20-pin plastic SOIC 20-pin plastic SOIC,Tape and Reel Pin Connections Block Diagram DS-M8888-R1 www.clare.com 1 M-8888 Single-Ended Input Configuration D...