MAX24188ETK+T

Overview

The MAX24188ETK+T is a low-cost IEEE 1588 clock IC designed to serve as the central time base in multiport systems. It provides hardware support for Ordinary, Boundary, and Transparent Clocks, enabling synchronization with an external master via software steering. The device features three time/frequency controls: Direct Time Write, Time Adjustment, and High-Resolution Frequency Adjustment. It operates from a single 1.2V supply with 3.3V I/O levels and accepts reference clocks of 10MHz, 12.8MHz, 25MHz, or 125MHz. Packaged in a 68-TQFN (8x8) exposed pad, it supports SPI communication.

Feature Summary

• IEEE 1588 Hardware Support: Enables Ordinary, Boundary, and Transparent Clock architectures with 1ns input timestamp accuracy.
• Flexible Controls: Offers Direct Time Write, Time Adjustment, and High-Resolution Frequency Adjustment to synchronize system elements.
• Programmable Outputs: Generates output clocks (125MHz/N) and time alignment signals (e.g., 1PPS) for slave components.
• Event Generation: Includes programmable event generators (PEG) and input event timestampers for precise edge detection.

Applications

• Central time-clock for 1588-enabled equipment with timestamping on multiple ports
• Wireless base stations and controllers
• Switches, routers, DSLAMs, and PON equipment
• Pseudowire circuit emulation equipment

Procurement Notes

Verify the specific revision status against the manufacturer's errata sheet before finalizing designs, as multiple revisions may be available simultaneously. Confirm that the 68-TQFN package dimensions align with the PCB footprint requirements. Ensure the design accommodates the 1.2V core voltage and 3.3V I/O interface levels for proper logic compatibility.

Selection Notes

Select this component when a centralized IEEE 1588 time base is required for multi-port Ethernet systems. It is suitable for applications needing software-steered synchronization rather than standalone frequency locking. Consider the 1.2V power requirement and ensure the system can provide one of the supported reference frequencies (10MHz, 12.8MHz, 25MHz, or 125MHz).

Part Context

The MAX24188 is part of Maxim Integrated's timing portfolio, specifically targeting IEEE 1588 Precision Time Protocol implementations. It functions as a central reference for timestampers across various line cards or network nodes. The device complements other synchronization ICs in multimode systems supporting synchronous Ethernet or frequency-only modes.

Replacement Considerations

No direct public substitute part numbers are identified in the provided documentation. Designers should evaluate other IEEE 1588 clock ICs from Analog Devices/Maxim or competitors based on pin compatibility and feature set if replacement is necessary.