CDC339DB

Overview

The CDC339DB is a single-circuit 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 maximum frequencies of 80 MHz and operates within a supply voltage range of 4.75V to 5.25V. It is housed in a 20-SSOP package (0.209 inch width) and functions reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Single circuit configuration providing one-to-eight fanout distribution
• TTL-compatible input and output logic levels
• Maximum operating frequency of 80 MHz
• Surface mount 20-SSOP package with 5.30mm width

Applications

• Clock signal distribution in digital systems
• Buffering TTL clock sources for multiple loads
• Industrial control system timing circuits

Procurement Notes

Verify the specific package variant, as the CDC339 family includes both SSOP and SOIC options. Confirm that the application environment remains within the specified 4.75V to 5.25V supply range and -40°C to +85°C temperature limits. Ensure compatibility with existing TTL logic requirements before integration.

Selection Notes

Select this component when a single-ended TTL clock source requires expansion to drive eight separate TTL destinations. The 80 MHz frequency limit defines the maximum operational speed. Consider the 20-SSOP footprint constraints during PCB layout. Verify that no differential signaling capabilities are required, as this model lacks them.

Part Context

This part belongs to the CDC339 series of clock buffers. It shares core electrical specifications with other variants in the family, such as the CDC339DWR, which utilizes a 20-SOIC package instead of the SSOP form factor. Both devices serve identical functional roles within the same voltage and frequency parameters.

Replacement Considerations

The CDC339DBR is a parameter-equivalent alternative offered in tape-and-reel packaging rather than bulk or tube.