621MLFT

Overview

The Renesas Electronics 621MLFT is a low skew 1:4 clock buffer belonging to the 621MILF series. It operates within a supply voltage range of 1.14 V to 1.89 V and supports maximum input and output frequencies of 200 MHz. The device features a maximum propagation delay of 5 ns and draws 50 mA during operation. Packaged in an 8-SOIC format for surface mount installation, it functions across an operating temperature range of -40°C to +85°C. This component is classified as obsolete and no longer manufactured.

Feature Summary

• Low skew 1:4 clock distribution architecture
• Maximum frequency support of 200 MHz
• Supply voltage range of 1.14 V to 1.89 V
• 8-SOIC surface mount package

Applications

• Clock signal distribution in digital systems
• Timing synchronization in high-speed data acquisition
• Peripheral clock generation in embedded controllers

Procurement Notes

The 621MLFT is officially discontinued by Renesas Electronics Corporation. Public records indicate End-of-Life (EOL) status with production cessation confirmed via Product Change Notification dated May 7, 2019. Current availability is restricted to existing market inventory from third-party distributors rather than direct manufacturer supply. Verification of authenticity and lot traceability is critical when sourcing from secondary markets due to the component's obsolete status.

Selection Notes

Designers requiring new implementations should transition to active alternatives within the Renesas portfolio, such as the 621SDCGI series. The successor devices offer updated specifications including lower jitter performance and broader voltage compatibility. Engineers must evaluate pin-to-pin compatibility and electrical parameter alignment when migrating from the obsolete 621MLFT to ensure system timing integrity without redesigning the printed circuit board layout.

Part Context

The 621MLFT is part of the ICS621 family, originally developed by Integrated Circuit Systems (ICS) before its acquisition by Renesas Electronics. The suffix 'MLFT' denotes the specific SOIC-8 package variant with tape-and-reel packaging options. This component represents a legacy solution for low-skew clock buffering applications prior to the introduction of more advanced low-jitter clock generator families.

Replacement Considerations

Public documentation identifies the 621SDCGI as a similar replacement option offered by Renesas Electronics. Designers should verify that the higher performance characteristics of the 621SDCGI are compatible with the original design constraints.