CDC339DBR

Overview

The CDC339DBR is a single-channel fanout buffer manufactured by Texas Instruments, designed for clock distribution applications. It accepts a TTL input signal and provides eight TTL outputs with a 1:8 ratio. The device supports a maximum operating frequency of 80 MHz and functions within a supply voltage range of 4.75V to 5.25V. It is housed in a 20-SSOP package (0.209 inch width) suitable for surface mount installation. The component operates reliably across an extended temperature range from -40°C to +85°C.

Feature Summary

• Single circuit configuration providing one-to-eight fanout capability
• Maximum switching frequency of 80 MHz
• TTL-compatible input and output logic levels
• Operates on a single 5V supply (4.75V to 5.25V)
• Available in 20-SSOP surface-mount packaging

Applications

• Clock distribution networks requiring signal buffering
• System timing architectures utilizing TTL logic families
• High-speed digital circuits needing fanout expansion

Procurement Notes

This component is identified as obsolete or discontinued by the manufacturer. Verification of current availability requires checking authorized distributors for remaining stock or surplus inventory. Sourcing should prioritize verified suppliers to ensure authenticity, as end-of-life status may limit direct procurement channels.

Selection Notes

Select this part when a single 5V-powered buffer with 1:8 fanout is required for TTL signals up to 80 MHz. Ensure the design accommodates the 20-SSOP footprint. Verify that the application environment stays within the -40°C to +85°C operating range and that no differential signaling is needed.

Part Context

The CDC339DBR belongs to the CDC339 family of clock buffers. It serves as a specific package variant (SSOP) of the core CDC339 device. Other variants in this family include different package options such as SOIC, but share identical electrical characteristics and functionality.

Replacement Considerations

The CDC339DW is listed as a parameter-equivalent alternative from Texas Instruments. This substitute offers the same electrical specifications but utilizes a 20-SOIC package instead of the SSOP form factor.