GENERAL DESCRIPTION

The MSM6889 is best suited to be used as a signal transmitter/receiver LSI for a telemetering system that employs a no-ringing communication system.

FEATURES

? Power supply : +5 V ±10, +2.5 V or higher for digital interface.

? Power consumption Operating mode : 9 mA Typ., 12 mA Max. Power down mode : 0.1 mA Max.

? The operating mode can be selected from PB tone transmit, PB tone detect, and FSK modem (answer/originate). The FSK modem cannot be operated concurrently with other functions. Modem test modes are also available.

? The call progress tone (CPT) detector operates in PB tone transmit mode or in FSK modem mode.

? PB receiver output is 3-state, and externally connectable to 4-bit input for PB tone generator through the bus line.

? Modem transmit/receive data, carrier detect, request to send, and call progress tone detect have their dedicated pins.

? Prefilter and smoothing filter are provided in analog input and output.

? On-chip 3.579545 MHz crystal oscillator

? 3.579545 MHz master clock output pin (CMOS compatible)

? Power down mode

? Modem : Conforms to ITU-T V.21 (300 bps, full-duplex)

? Transmit analog signals (modem signal, DTMF tone) : Level is independently adjustable externally. Carrier detect level is also adjustable externally.

? Package options:

42-pin plastic DIP (DIP42-P-600-2.54) (Product name : MSM6889RS)

56-pin plastic QFP (QFP56-P-1519-1.00-K) (Product name : MSM6889GS–K)