CY7B991V-7JC

Overview

The CY7B991V-7JC is a programmable skew clock buffer from the RoboClock series, manufactured by Cypress Semiconductor Corp. It functions as an 8:8 buffer/driver with LVTTL outputs, designed for high-performance system timing optimization. The device operates within a supply voltage range of 2.97V to 3.63V and supports frequencies up to 80 MHz. Housed in a 32-PLCC (J-Lead) surface-mount package, it provides user-selectable output functions including skew control, inversion, and frequency division/multiplication capabilities.

Feature Summary

• Programmable Skew Control: User-selectable skew up to 18 ns with typical pair skew <100 ps.
• Flexible Frequency Operation: Supports input frequencies as low as 3.75 MHz with output multiplication (2x, 4x) or division (1/2, 1/4).
• Low Jitter Performance: Peak-to-peak jitter less than 200 ps (< 25 ps RMS).
• High Drive Capability: Outputs drive terminated transmission lines with impedances as low as 50Ω.

Applications

• High-performance computer systems requiring optimized clock timing.
• Systems driving terminated transmission lines with 50Ω impedance.
• Applications requiring precise clock distribution with minimal skew.

Procurement Notes

Verify the specific suffix 'V' against official Cypress documentation to confirm voltage or temperature grade variations. Confirm RoHS compliance status as older Cypress components may not meet current standards. Ensure the 32-PLCC package dimensions match the target PCB footprint requirements.

Selection Notes

Select this component when precise programmable skew adjustment is required between clock outputs. It is suitable for designs needing flexible frequency scaling (division/multiplication) from a single input source. Verify that the LVTTL output levels are compatible with downstream logic inputs.

Part Context

This part belongs to the RoboClock family of programmable skew clock buffers. It shares functional similarities with the CY7B992 series, though the CY7B991 specifically delivers TTL-level outputs compared to the CMOS outputs of the CY7B992. Both series offer identical skew and frequency manipulation features.

Replacement Considerations

The CY7B992-7JC is a direct functional alternative within the same family, differing primarily in output voltage levels (CMOS vs. TTL). Verify output compatibility before substitution. Other RoboClock variants may offer different pin counts or package types.