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FX604D4

V23 Compatible Modem

CML Microsystems Plc 

CML Semiconductor Products

V23 Compatible Modem FX604

1.0 Features

D/604/3 November 1996

Provisional Information

• 1200/75 bits/sec Full Duplex V23 compatible Modem with:

• Optional 75bits/sec Back Channel • Optional Line Equalisation

• Optional 1200bits/sec Data

Retiming Facility

• -40°C to +85°C Operating

Temperature

• 3.58MHz Xtal/Clock Rate

• 16-pin SOIC and DIP Packages

• 3.0 to 5.5V Supply; 1.0mA typ. at 3V • Conforms to relevant sections of

'Zero-Power' Mode; 1µA typ.

V23 and ETSI specifications

1.1 Brief Description

The FX604 is a low power CMOS integrated circuit for the reception or transmission of asynchronous

1200bits/sec data in accordance with CCITT V.23 and ETSI specifications. It is also capable of generating the

75bits/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. The device can disable the back channel or be operated so

only the mark or space tone is produced. An optional line equaliser is incorporated into the receive path, this is

controlled by an external logic level.

The FX604 may be used in a wide range of telephone telemetry systems. With a low voltage requirement of

3.0V it is suitable for both portable terminal and line powered applications. A very low current 'sleep' mode (1µ

A typ.) and operating current of 1mA typ. mean the device is ideal for line powered applications. A 3.58MHz

standard Xtal/Clock rate is required and the device operates from a 3.0 to 5.5V supply. Both SOIC (D4) and

Plastic DIL (P3) 16-pin package types are available.

© 1996 Consumer Microcircuits Limited

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