CY7B992-2JC

Overview

The CY7B992-2JC is a programmable skew clock buffer from the RoboClock family, manufactured by Cypress Semiconductor. It features an integrated phase-locked loop (PLL) architecture that provides zero input-to-output delay and aligns output clocks in both phase and frequency with a reference input. The device offers eight CMOS outputs arranged in four user-controllable pairs, capable of driving terminated transmission lines with impedances as low as 50Ω. Key specifications include an operating frequency range of 3.75 MHz to 80 MHz, typical output pair skew of less than 100 ps, and peak-to-peak jitter under 200 ps. It supports selectable skew up to ±18 ns, frequency division by two or four, and multiplication by two or four.

Feature Summary

• Integrated PLL for zero input-to-output delay and precise phase alignment
• Eight CMOS outputs in four pairs with selectable skew up to ±18 ns
• Supports divide-by-two/four and multiply-by-two/four functions
• Low jitter (<200 ps peak-to-peak) and typical matched-pair skew <100 ps

Applications

• Zero-skew clock distribution trees for high-performance computer systems
• Equalizing skew between metal traces of different lengths on PCBs
• Clock multiplier applications distributing low-frequency clocks locally multiplied
• Clock divider applications requiring synchronized divided frequencies

Procurement Notes

Verify the specific suffix 'JC' against the manufacturer's ordering guide to confirm package type and temperature grade. Confirm RoHS compliance status as older revisions may vary. Check for end-of-life status given the component's age. Ensure the source document matches the datasheet revision *E or later for accurate electrical characteristics.

Selection Notes

Select the CY7B992 variant specifically for CMOS logic level outputs; the CY7B991 provides TTL levels. Choose the '-2' speed grade for tighter skew specifications (<250 ps max) compared to '-5' or '-7' grades. Ensure the system operates within the 5V ±10% supply voltage range. Verify that the required frequency range falls within the capabilities defined by the FS pin configuration.

Part Context

This component belongs to the Cypress RoboClock series of programmable skew clock buffers. It is functionally similar to the CY7B991 but differs in output logic levels (CMOS vs. TTL). The part number indicates a commercial temperature grade and a specific package variant. It is designed to replace discrete clock buffering solutions by integrating PLL, skew adjustment, and fanout capabilities into a single 32-pin PLCC/LCC package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consider checking for newer generations from Infineon (post-Cypress acquisition) or equivalent devices from IDT (e.g., QS5992) which are noted as pin-compatible in some contexts, though verification of electrical parameters is required.