2308-1HDCGI

Overview

The IDT2308-1HDCGI is a discontinued high-speed phase-lock loop (PLL) clock multiplier manufactured by Renesas Electronics Corporation. It functions as a zero-delay buffer, aligning the phase between incoming and output clocks to eliminate propagation delay. The device accepts a single LVTTL input and provides eight LVTTL outputs arranged in two banks of four. It operates within a frequency range of 10MHz to 133.3MHz with a supply voltage of 3V to 3.6V. Key electrical specifications include an output skew of less than 200 ps and cycle-to-cycle jitter under 200 ps. The component is housed in a 16-SOIC package.

Feature Summary

• Zero-delay buffer architecture synchronizes outputs directly to the input clock phase
• Distributes one clock input to eight outputs across two independently controllable banks
• Supports external feedback pin for precise delay control between input and outputs
• Low power consumption with tri-state outputs drawing less than 25uA in power-down mode

Applications

• High-speed clock distribution systems requiring minimal skew
• Clock multiplication and buffering for processors and memory interfaces
• System testing modes where PLL bypass allows direct input clock drive

Procurement Notes

This part number is officially obsolete and no longer manufactured. Verification of availability requires checking secondary market distributors for surplus stock. Replacement components must be evaluated for pin compatibility and electrical parameter alignment, specifically the 1:8 ratio and 3.3V operation.

Selection Notes

Select replacement devices that maintain the 1:8 input-to-output ratio and support the 10MHz to 133.3MHz frequency range. Ensure the substitute component offers comparable output skew and jitter performance. Verify that the new package type matches the existing PCB footprint or plan for mechanical adaptation if using a different package such as TSSOP.

Part Context

The 2308 series comprises various configurations for prescaling and multiplication. The -1 variant specifically provides a 1x multiplication factor. This component belongs to the legacy IDT clock multiplier line, now managed by Renesas Electronics following corporate acquisitions. It was designed for commercial temperature ranges and standard logic levels.

Replacement Considerations

Publicly documented upgrade alternatives include the CDCVF25081PW and CDCVF25081PWR from Texas Instruments. These parts serve as functional replacements for the zero-delay buffering requirement.