CY7B991-7JC

Overview

The CY7B991-7JC is a programmable skew clock buffer from the RoboClock series, manufactured by Infineon Technologies. It features an integrated Phase-Locked Loop (PLL) for zero input-to-output delay and provides eight TTL outputs arranged in four pairs. The device operates within a frequency range of 3.75 MHz to 80 MHz with a supply voltage of 4.5V to 5.5V. Key electrical parameters include a typical output pair skew of less than 100 ps and peak-to-peak jitter under 200 ps. It is housed in a 32-pin PLCC package and supports user-selectable output functions including inversion and frequency division.

Feature Summary

• Integrated PLL provides zero input-to-output delay and tracks incoming REF signal
• User-selectable output skew up to ±6 time units relative to nominal position
• Supports divide-by-two and divide-by-four output functions for flexible clock distribution
• Outputs drive 50Ω terminated lines with low operating current

Applications

• High-performance computer system timing optimization
• Zero-skew clock distribution trees
• Equalizing skew between metal traces of different lengths
• Frequency multiplication and division applications

Procurement Notes

Verify component authenticity through authorized channels as this part may be subject to obsolescence. Confirm that the specific ordering suffix corresponds to the required accuracy grade and package type. Ensure compatibility with existing PCB footprints for the 32-PLCC package before procurement.

Selection Notes

Select the CY7B991-7JC when TTL logic levels are required for both inputs and outputs. Choose this variant over CMOS versions if the application demands specific drive characteristics compatible with TTL standards. Verify that the operating temperature range meets the commercial requirements of 0°C to +70°C.

Part Context

This component belongs to the CY7B991/CY7B992 Programmable Skew Clock Buffer family originally developed by Cypress Semiconductor Corporation. The product line was acquired by Infineon Technologies. The CY7B991 specifically denotes the TTL output version, distinct from the CMOS-based CY7B992.

Replacement Considerations

Direct replacements must match the 32-PLCC package and TTL output configuration. Consider the CY7B991-5JC or CY7B991-2JC for lower skew specifications within the same package. Cross-family alternatives like the CY7B992 series require logic level adaptation.