MK2069-01GI

Overview

The MK2069-01 is a VCXO-based clock generator providing synchronization, jitter attenuation, and frequency translation. It accepts input clocks from 1 kHz to 170 MHz and generates outputs from 500 kHz to 160 MHz. The device features a 3:1 input MUX for master/slave selection and a PLL lock status output. It operates on a single 3.3 V supply with 5 V tolerant inputs on ICLK0 and ICLK1. Packaged in a 56-pin TSSOP, it includes a CLR function for rapid phase synchronization and free-run capability without an input clock.

Feature Summary

• VCXO-based architecture provides low phase noise and jitter attenuation via user-configurable external loop filter components.
• Dual PLL structure: VCXO PLL for jitter cleaning and Translator PLL for frequency multiplication up to 160 MHz.
• 3:1 Input MUX allows selection among three reference clocks (ICLK0, ICLK1, ICLK2) with asynchronous switching.
• PLL Clear (CLR) function enables seamless phase alignment to new inputs, eliminating extra clock cycles and wander.

Applications

• Line card applications requiring system synchronization and backup clock selection.
• Network equipment needing jitter attenuation for unstable or noisy input references.
• Systems requiring frequency translation from low-frequency inputs to higher output rates.

Procurement Notes

Verify component authenticity through authorized channels. Confirm the specific suffix 'GI' matches the required environmental compliance and package variant. Check for End-of-Life (EOL) notices regarding non-green parts as indicated in historical documentation. Ensure external loop filter components are selected to meet specific jitter attenuation and stability requirements.

Selection Notes

Select this device when low phase noise generation is critical despite low-frequency or jittery input sources. Designers must configure external resistors and capacitors to set the VCXO PLL loop bandwidth and damping factor. Ensure the external crystal frequency falls within the 8–27 MHz range for optimal performance. Verify that the required output frequencies can be achieved using the available divider ratios.

Part Context

The MK2069-01 belongs to the IDT VCXO-based line card synchronizer family. It is designed for mixed analog/digital integrated circuits where PCB layout sensitivity impacts performance. The device replaces discrete VCXO-based hybrid timing solutions to reduce cost while maintaining high performance standards for telecom and networking infrastructure.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate alternative VCXO-based clock generators with similar input/output frequency ranges and dual PLL architectures if replacement is necessary.

FAQ

How does the MK2069-01 handle phase alignment when switching between input clocks?

The device uses the CLR (Clear) input to reset the FV Divider before reselecting the input via the MUX. This removes the memory of the previous phase, allowing the VCXO PLL to lock to the new input with minimal cycle slips and no extra clock cycles.

What determines the jitter attenuation characteristics of the MK2069-01?

Jitter attenuation is determined by the VCXO PLL's low-pass frequency response, which is configured by selecting external passive components (RS, CS, CP, RSET) and setting the SV and FV divider values.

Can the MK2069-01 operate without an active input clock?

Yes, the device will free-run based on the external VCXO crystal frequency if no input clock is present. The CLR pin can also provide a short-term holdover function by keeping the charge pump inactive.