CY7B991V-5JIT

Overview

The CY7B991V-5JIT is a 3.3 V RoboClock low-voltage programmable skew clock buffer manufactured by Infineon Technologies. It features an integrated phase-locked loop (PLL) providing zero input-to-output delay and operates within a frequency range of 3.75 MHz to 80 MHz. The device offers eight LVTTL outputs arranged in four pairs, supporting user-selectable functions including inverted/non-inverted signals, divide-by-two/four operations, and programmable skew up to ±6 time units. It utilizes a 32-pin PLCC package and operates from a single 3.3 V supply with an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated PLL provides zero input-to-output delay and low cycle-to-cycle jitter (200 ps peak).
• Eight LVTTL outputs configurable for skew, inversion, or frequency division (÷2, ÷4).
• Programmable skew matrix allows output timing adjustments up to ±6 time units.
• Operates at frequencies up to 80 MHz with a single 3.3 V power supply.

Applications

• Zero-skew clock distribution trees in high-performance computer systems.
• Compensating for trace length mismatches in PCB layouts via programmable skew.
• Clock multiplication and division applications requiring precise phase alignment.

Procurement Notes

Verify the specific suffix 'JIT' against official Infineon documentation to confirm packaging type and temperature grade, as datasheets may list standard variants like JXC or AXI. Confirm availability status, as this component series may be subject to end-of-life notifications or limited production runs.

Selection Notes

Select the CY7B991V-5 variant for industrial temperature operation (-40°C to +85°C). Ensure the system clock frequency falls within the 3.75 MHz to 80 MHz range. Verify that the required number of inverted or divided outputs matches the available configuration options for the four output pairs.

Part Context

The CY7B991V belongs to the RoboClock family of low-voltage programmable skew clock buffers. This series is designed to optimize timing in complex digital systems by allowing flexible clock tree management through internal PLL synchronization and external pin-programmable skew controls.

Replacement Considerations

Check for direct replacements within the CY7B991V series with different suffixes (e.g., JXC, AXI) that match the required package and temperature rating. Cross-reference with other RoboClock devices if pin compatibility or functional equivalence is required.

FAQ

What is the maximum operating frequency of the CY7B991V?

The maximum operating frequency is 80 MHz, determined by the FS pin configuration.

How is the programmable skew controlled?

Skew is controlled via three-level function select inputs (xF0, xF1) for each output pair, allowing delays from -6tU to +6tU relative to the feedback input.

Can the device perform frequency multiplication?

Yes, by connecting a divided output (÷2 or ÷4) to the FB input, the PLL multiplies the REF input frequency at the undivided outputs.