MK2746G

Overview

The MK2746G is a DVD/MPEG clock synthesizer manufactured by IDT, now part of Renesas Electronics. It accepts a 27 MHz fundamental mode crystal or clock input to generate multiple output clocks including processor, audio, bus driver, SDRAM, and video clocks. The device operates at 3.3 V with an ambient temperature range of 0°C to +70°C. Key electrical parameters include a maximum short-term peak-to-peak jitter of 100 ps for the processor clock and 200 ps for other clocks. It utilizes analog PLL techniques with patented zero ppm error technology to ensure precise audio-video synchronization.

Feature Summary

• Generates selectable processor, audio, fixed 27 MHz video, 50 MHz bus, and 133.33 MHz SDRAM clocks from a single 27 MHz input.
• Patented zero ppm error technique locks audio clocks to the 27 MHz input for exact tracking without large buffer memory.
• Packaged in a 16-pin TSSOP (173 mil) using advanced low-power sub-micron CMOS process.
• Supports tight jitter-controlled processor clock outputs via PS1/PS0 pin selection.

Applications

• DVD players and drives
• MPEG-2 based multimedia applications
• Set-top boxes

Procurement Notes

Verify component authenticity as the MK2746G is an older generation product originally from Integrated Device Technology (IDT). Confirm RoHS compliance status, noting that non-green parts reached End-of-Life on May 13, 2010. Ensure the specific ordering suffix matches the required shipping packaging (Tube vs. Tape and Reel) and lead-free specifications before procurement.

Selection Notes

Select the MK2746G when designing systems requiring precise audio-video synchronization for MPEG-2 applications. Choose this component if a 27 MHz reference is available and specific frequencies like 133.33 MHz SDRAM or 50 MHz bus clocks are needed. Verify that the operating temperature range of 0°C to +70°C meets system requirements and that the 16-pin TSSOP package fits the PCB layout constraints.

Part Context

The MK2746G belongs to the IDT DVD/MPEG Clock Source family. It was designed to eliminate crystals and oscillators from boards by integrating frequency synthesis. While IDT was acquired by Renesas Electronics Corporation, the datasheet identifies the manufacturer as Integrated Device Technology, Inc. This part serves as a specialized clock generator rather than a general-purpose buffer or multiplier.

Replacement Considerations

Non-green versions of this part reached End-of-Life on May 13, 2010. For new designs, consider RoHS-compliant variants such as the MK2746GLF or MK2746GLFT. Evaluate modern clock synthesizers from Renesas or other vendors if current supply availability is critical, as this legacy part may have limited stock.

FAQ

How is the processor clock frequency selected?

The processor clock frequency is determined by the logic levels on pins PS1 and PS0. Options include 6.66 MHz, 41.66 MHz, 50 MHz, and 58.33 MHz depending on the combination of GND and VDD connections.

What is the purpose of the zero ppm error technique?

This patented technique frequency-locks the audio clocks to the 27 MHz input, allowing audio and video to track exactly. This eliminates the need for large buffer memory in DVD and MPEG applications.

What are the fixed output frequencies provided by the MK2746G?

The device provides fixed outputs of 27 MHz (Video), 50 MHz (DSP/Bus clock), and 133.33 MHz (SDRAM).