2308-3DCG8

Overview

The Renesas Electronics Corporation 2308-3DCG8 is a discontinued 3.3V PLL zero-delay clock multiplier designed for high-speed clock distribution and multiplication applications. It operates within an input frequency range of 10 MHz to 133 MHz, providing eight LVTTL outputs with a maximum output frequency of 133 MHz. The device achieves zero delay by aligning the phase between the incoming clock and the output clock. Key electrical parameters include a maximum duty cycle of 60%, jitter of 400 ps, and a supply current of 45 mA at 3.3 V. It is housed in a 16-SOIC package suitable for surface-mount installation.

Feature Summary

• Zero-delay buffer architecture synchronizes output clocks to the input reference clock phase.
• Eight LVTTL outputs distributed across two independent banks for flexible configuration.
• Supports external feedback loop closure to control delay between input and outputs.
• Operates on a single 3.3 V power supply with low standby current in power-down mode.

Applications

• High-speed clock distribution networks requiring precise phase alignment.
• System synchronization where zero skew between input and multiple outputs is critical.
• Test modes utilizing direct input clock drive to outputs when PLL is bypassed.

Procurement Notes

The 2308-3DCG8 is officially listed as obsolete or end-of-life by the manufacturer. Verification of availability requires checking authorized distributors for remaining stock or surplus market sources. Confirm RoHS compliance status and moisture sensitivity level (MSL) before procurement, as legacy components may have specific handling requirements. Cross-reference part numbers such as IDT2308-3DCG8 for potential equivalent sourcing.

Selection Notes

Select this component for designs requiring a 1:8 clock multiplication ratio with zero delay characteristics. Ensure the application supports LVTTL output levels and operates within the 0°C to +70°C commercial temperature range. Verify that the PCB layout accommodates the 16-SOIC package dimensions and pitch. Consider the 400 ps jitter specification against system timing margins. Alternative variants like the 2308A series may offer different packaging or slight parameter variations if the exact 2308-3DCG8 is unavailable.

Part Context

This device belongs to the IDT 2308 family of zero-delay clock multipliers, originally developed by Integrated Device Technology (IDT) and later acquired by Renesas Electronics. The family includes variants with different multiplication ratios (1x, 2x, 4x) and drive strengths. The 2308-3DCG8 specifically denotes the 3.3V operation, SOIC-16 package, and 133 MHz capability within this lineage.

Replacement Considerations

Direct replacement parts are limited due to the obsolete status. Potential substitutes include other members of the 2308 family such as IDT2308-3DCG8 (if available in tape/reel) or similar zero-delay buffers from Renesas with compatible pinouts and voltage levels. Verify functional equivalence regarding jitter, skew, and output drive strength before substitution.