CY29973AXI

Product Overview

The Cypress Semiconductor Corp CY29973AXI is a surface-mount clock timing integrated circuit in a 52-TQFP (10x10) package. It combines fanout distribution, multiplexing, spread-spectrum clock generation, and zero-delay buffering in a single circuit. The device accepts PECL input and provides clock outputs, with a 4:12 input-to-output ratio and a maximum frequency rating of 125 MHz. It includes a PLL with bypass, supports division but not multiplication, operates from a 2.9 V to 3.6 V supply, and is specified for -40°C to 85°C.

Key Features

• Integrates fanout distribution, multiplexing, spread-spectrum clock generation, and zero-delay buffering functions.
• PECL input with clock output and a 4:12 input-to-output ratio.
• PLL with bypass and divider support, without multiplier support.
• Maximum frequency of 125 MHz.
• 2.9 V to 3.6 V supply and -40°C to 85°C operating temperature.
• 52-TQFP (10x10) surface-mount package.

Applications

• Distribution of clock signals from a PECL input source to multiple downstream timing paths.
• Multiplexing of clock paths within a single-circuit timing subsystem.
• Spread-spectrum clock generation in timing subsystems rated up to 125 MHz.
• Clock distribution paths that use zero-delay buffering from a PECL input to clock outputs.

Design & Procurement Notes

When selecting the CY29973AXI for a board design, confirm that the incoming clock source is PECL and that the downstream timing paths accept the provided clock outputs. The 4:12 ratio, single circuit count, and 125 MHz maximum frequency should be matched to the required fanout and timing budget. Because the device supports division but not multiplication, any frequency conversion must remain within the specified ratio and frequency rating. Layout should account for the 52-TQFP (10x10) surface-mount package, the 2.9 V to 3.6 V supply range, and the -40°C to 85°C operating temperature range.