FX614P3

Overview

The FX614P3 is a low-power CMOS integrated circuit designed for Bell 202 compatible modem applications, supporting asynchronous data transmission and reception at 1200 bits/sec. It features an optional back channel operating at 5 bits/sec or 150 bits/sec and includes a data retiming facility to interface directly with microcontrollers without a UART. The device operates on a 3.0V to 5.5V supply, drawing only 1.0mA during active mode and 1μA in 'Zero-Power' sleep mode. It utilizes a standard 3.579545MHz crystal clock and incorporates an FSK modulator/demodulator, receive filter with equalization, and energy detection circuits.

Feature Summary

• Integrated FSK modulation and demodulation for Bell 202 compliant voiceband communication
• Optional data retiming capability eliminates the need for external UARTs in host microcontrollers
• Configurable multi-rate back channel support for 5 bits/sec or 150 bits/sec auxiliary data
• Ultra-low power consumption with a dedicated 'Zero-Power' mode for battery-operated systems

Applications

• Telephone telemetry systems requiring low-cost modem interfaces
• Portable terminal devices powered by limited voltage supplies
• Line-powered communication equipment utilizing minimal current budgets

Procurement Notes

Verify package type compatibility, as the P3 suffix denotes a 16-pin Plastic DIL configuration. Confirm that the design accommodates the required 3.579545MHz crystal oscillator components. Ensure the application logic correctly manages the M0 and M1 mode control pins to activate specific baud rates and the Zero-Power state. Review the line interface circuit requirements for proper isolation and impedance matching.

Selection Notes

Select this component for designs prioritizing ultra-low standby current and direct MCU interfacing via the retiming feature. The P3 variant is suitable for through-hole mounting requirements. Consider the FX614D4 if surface-mount assembly is preferred. Evaluate the necessity of the optional back channel and equalizer functions against system complexity constraints.

Part Context

The FX614 series belongs to CML Micro's legacy portfolio of analog-digital mixed-signal communication semiconductors. Originally manufactured by Consumer Microcircuits Limited, these parts were later integrated into the broader CML Microsystems group. The prefix 'FX' distinguishes these units from the later CMX-branded products while sharing underlying silicon architecture.

Replacement Considerations

No direct public substitute part numbers are documented for the FX614P3. Designers may consider the CMX867 family for modern V.22/V.23 modem applications, though functional differences exist.