CMX867

V.22, Bell 212A 1200/1200 or 600/600 bps DPSK
V.23 1200/75, 1200/1200, 75, 1200 bps FSK
Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK
V.21 or Bell 103 300/300 bps FSK
DTMF/Tones Transmit and Receive
'(R)Powersave' Standby Mode
Software and Hardware Compatible with CMX868

The CMX867 is a multi-standard modem for use in telephone based information and telemetry systems. 
Control of CMX867 is via a simple high speed serial bus, compatible with most types of  C seri
interface. The data transmitted and received by the modem is also transferred over the same serial bus
On-chip programmable Tx and Rx USARTs meeting the requirements of V.14 are provided for use with
asynchronous data and allow unformatted synchronous data to be received or transmitted as 8-bit words.
It can transmit and detect standard DTMF and modem calling and answer signals or user-specifi
programmed single or dual tone signals. A general purpose Call Progress signal detector is also included
Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive externacomponents to build a 2 or 4-wire line interface.
CMX867 also features a Hook Switch Relay Drive output and a Ring Detector circuit which continues
to function when the device is in the Powersave mode, providing an interrupt which can be used to wake
up the host |ìController when line voltage reversal or rnging is detected.
The CMX867 operates from a single 2.7 to 5.5V supply over a temperature range of -40!aC to +85!aC a
is available in 24-pin TSSOP, SOIC and DIP packages.