CML Semiconductor Products

Bell 202 Compatible Modem

FX614

© 1997 Consumer Microcircuits Limited

Advance Information

1.0

Features

•• 1200bits/sec 1/2 Duplex Bell 202 compatible Modem with:

•• Optional 5bits/sec and

150bits/sec Back Channel

•• Optional 1200bits/sec Data

Retiming Facility

•• 3.0 to 5.5V Supply; 1.0mA at 3V

'Zero-Power' Mode; 1

µµA

•• Optional Line Equalisation

•• -40°C to +85°C Operating

Temperature

•• 16-pin SOIC and DIL Packages

•• 3.58MHz Xtal/Clock Rate

1.1

Brief Description

The FX614 is a low power CMOS integrated circuit for the reception or transmission of asynchronous

1200bits/sec data and is suitable for use in Bell 202 type systems. It is also capable of generating the

5bits/sec or 150bits/sec 'back channel'.

The device incorporates an optional Tx and Rx data retiming function that removes the need for a UART in the

associated

µC when operating at 1200bits/sec. An optional line equaliser is incorporated into the receive path,

this is controlled by an external logic level.

The FX614 may be used in a wide range of telephone telemetry systems. With a low operating voltage of

3.0V, a very low current 'sleep' mode (1

µA) and an operating current of 1mA the device is ideal for portable,

terminal and line powered applications. A 3.58MHz standard Xtal/Clock rate is required and the device

operates from a 3.0V to 5.5V supply. Both SOIC (D4) and Plastic DIL (P3) 16-pin package types are available.