CY26121ZC-21

Product Overview

The Cypress Semiconductor Corp CY26121ZC-21 is a clock/timing integrated circuit for fanout distribution, multiplexing, and spread-spectrum clock generation. The device accepts a clock or crystal input and provides a clock output through a single circuit with a 1:5 input-to-output ratio. It includes a PLL with bypass and supports divider operation, while multiplier operation is not available. The maximum frequency is 33.33 MHz, and the input and output interfaces are non-differential. The part operates from a 3.135 V to 3.465 V supply and is housed in a 16-TSSOP surface-mount package.

Key Features

• Fanout distribution, multiplexer, and spread-spectrum clock generator functions
• PLL with bypass
• Clock or crystal input with clock output
• Single circuit with 1:5 input-to-output ratio
• Divider available; multiplier not available
• Non-differential input and output
• Maximum frequency 33.33 MHz
• Supply voltage range 3.135 V to 3.465 V
• Operating temperature range 0°C to 70°C
• 16-TSSOP surface-mount package (0.173", 4.40 mm width)

Applications

• Clock distribution in timing subsystems where one reference clock is distributed to multiple loads
• Reference clock multiplexing in systems that require a single clock output from clock or crystal inputs
• Spread-spectrum clock generation in timing paths that require a clock output with spread-spectrum characteristics

Design & Procurement Notes

When selecting this device, confirm that the timing chain can operate from a clock or crystal input and deliver a non-differential clock output using a single circuit and 1:5 input-to-output ratio. The 33.33 MHz maximum frequency, 3.135 V to 3.465 V supply range, and 0°C to 70°C operating range should be matched to board-level power, thermal, and timing requirements. The presence of a PLL with bypass and a divider, but not a multiplier, should be checked against required frequency translation. The 16-TSSOP surface-mount package and 4.40 mm width affect PCB land pattern, routing density, and rework planning.