CDCU877ARHAR

Application Specific Clock/Timing Overview

The CDCU877ARHAR is a 1.8-V phase-locked loop (PLL) clock driver designed for DDR2 SDRAM applications. It distributes one differential clock input to ten differential outputs and one feedback pair. The device operates at frequencies from 10 MHz to 400 MHz with low static phase offset of ±50 ps and cycle-to-cycle jitter of ±30 ps. It supports spread spectrum clocking for EMI reduction and features fail-safe inputs. Powered by VDDQ (1.7 V to 1.9 V), it consumes less than 135 mA dynamically. The component is housed in a 40-pin MLF (RHA) package and functions within an operating temperature range of -40°C to 85°C.

Application Specific Clock/Timing Feature Summary

• Distributes one differential clock input to ten differential outputs and one feedback pair
• Low static phase offset of ±50 ps and dynamic phase offset of ±15 ps
• Cycle-to-cycle period jitter specification of ±30 ps at 160 MHz to 340 MHz
• Supports spread spectrum clocking (SSC) for reduced electromagnetic interference

Application Specific Clock/Timing Applications

• DDR2 SDRAM memory systems
• Clock distribution networks requiring low skew
• Systems utilizing spread spectrum clocking for EMI compliance

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix 'RHAR' corresponds to the 40-pin MLF package and 2500-unit tape-and-reel quantity. Confirm RoHS compliance and lead finish details via the latest Texas Instruments Package Option Addendum, as manufacturing parameters may update over time.

Application Specific Clock/Timing Selection Notes

Select this component when a zero-delay buffer is required to fan-out a single reference clock to multiple DDR2 loads. Ensure the design accommodates the 1.8-V supply voltage and utilizes external feedback pins (FBIN/FBIN) to synchronize outputs to the input clock for precise timing alignment.

Application Specific Clock/Timing Part Context

The CDCU877ARHAR belongs to the CDCU877 family of 1.8-V PLL clock drivers. It shares functional characteristics with variants like the CDCU877AZQL but differs in physical packaging. The RHA suffix specifically denotes the 40-pin MicroStar Junior BGA/MLF form factor suitable for high-density board layouts.

Application Specific Clock/Timing Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation. Designers should consult the TI datasheet's similar parts section or contact Texas Instruments directly for validated pin-compatible alternatives.