CY29976AI

Overview

The CY29976AI is a 3.3V, 125-MHz multi-output zero-delay buffer manufactured by Infineon Technologies (originally Cypress Semiconductor). It features an integrated PLL with a VCO lock range of 200 MHz to 480 MHz and supports PECL or oscillator reference inputs. The device provides twelve configurable clock outputs across three independent banks (QA, QB, QC) with a maximum output frequency of 125 MHz. It operates within an industrial temperature range of –40°C to +85°C and is housed in a 52-pin TQFP package.

Feature Summary

• Zero-delay buffering with glitch-free output frequency transitions
• Twelve configurable clock outputs divided into three independent banks
• Supports dynamic toggling via two reference clock inputs
• Serial programmable output disable for power management

Applications

• Intel CPU server platforms
• PowerPC processor systems
• Pentium processor architectures

Procurement Notes

Verify component authenticity as the datasheet notes this part is not recommended for new designs. Confirm package type matches the 52-pin TQFP specification. Ensure supply voltage constraints between 2.97V and 3.63V are met during operation.

Selection Notes

Select this component when low-skew clock distribution is required for legacy Intel or PowerPC processors. Verify that the input reference frequency allows the internal VCO to remain within the 200 MHz to 480 MHz lock range. Consider serial control requirements if dynamic output freezing is necessary.

Part Context

This device belongs to the CY29976 family of zero-delay buffers. It serves as a direct replacement for older SC973X series components due to pin compatibility. The AI suffix denotes the industrial temperature grade and lead-free construction within the 52-pin TQFP form factor.

Replacement Considerations

Pin-compatible with SC973X series devices.