MX614TN

Overview

The MX614TN is a low voltage, low power CMOS integrated circuit designed for the reception or transmission of asynchronous 1200bps data. It is compatible with Bell 202 type systems and supports data rates up to 1818bps. The device operates from a 3.0V to 5.5V supply and features an optional 1200bps data retiming facility that can eliminate the need for an external UART. It includes support for 5bps and 150bps back channels and an optional line equalizer controlled by an external logic level. The MX614TN is housed in a 24-pin TSSOP package.

Feature Summary

• Supports half-duplex Bell 202 compatible modulation at 1200bps with optional back channel capabilities
• Includes optional Tx and Rx data retiming functions to interface directly with microcontrollers
• Features a switchable receive filter equalizer to attenuate out-of-band noise and interfering signals
• Operates in a Zero-Power mode with typical current consumption of 1µA

Applications

• Telephone telemetry systems
• Portable terminal applications
• Line powered communication devices

Procurement Notes

Verify the component status before integration as it may be marked as Not Recommended for New Designs (NRND). Confirm the specific package variant matches the design requirements, as the MX614 series offers multiple packaging options including SOIC and PDIP. Ensure the clock source meets the strict frequency tolerance required for correct FSK operation.

Selection Notes

Select this component for applications requiring Bell 202 compatibility with minimal external logic. The choice between raw demodulation and data retiming depends on the host microcontroller's UART availability. Designers must account for the 20ms stabilization delay when transitioning from Zero-Power mode to active operation. External line interface components are necessary to handle telephone line voltages and impedance matching.

Part Context

The MX614TN belongs to the MX614 family of telecommunications interface ICs manufactured by CML Microcircuits. This series focuses on low-power modem solutions for legacy and specialized telemetry networks. The TN suffix specifically denotes the 24-pin Thin Shrink Small Outline Package (TSSOP), distinguishing it from the 16-pin SOIC and PDIP variants available in the same product line.

Replacement Considerations

Public confirmed substitute part numbers: None identified.