CDC340DW

Overview

The CDC340DW is a single-circuit fanout buffer manufactured by Texas Instruments, designed for clock distribution applications. It features an 8:1 output ratio with TTL-compatible input and output signals. The device operates within a supply voltage range of 4.75V to 5.25V and supports a maximum frequency of 80 MHz. It is housed in a 20-SOIC package (0.295 inch width) and is rated for commercial operating temperatures from 0°C to 70°C.

Feature Summary

• Single circuit configuration with 1:8 fanout ratio
• TTL-compatible input and output logic levels
• Maximum operating frequency of 80 MHz
• Surface mount 20-SOIC package

Applications

• Clock signal distribution in digital systems
• Buffering TTL clock sources for multiple loads
• Fanout expansion in timing circuits

Procurement Notes

Verify the specific temperature grade against application requirements, as this component is rated for 0°C to 70°C rather than the industrial -40°C to 85°C range found in similar parts like the CDC337DWG4. Confirm package dimensions match the PCB footprint design for the 20-SOIC case.

Selection Notes

Select this part when a single-ended TTL-to-TTL fanout buffer is required at frequencies up to 80 MHz. Ensure the system power supply remains stable between 4.75V and 5.25V. Consider alternative models if industrial temperature operation or differential signaling is necessary.

Part Context

This component belongs to the Texas Instruments clock buffer and driver category. It serves as a standard solution for distributing a single clock signal to eight destinations using TTL logic levels, distinct from high-speed LVDS or CML buffers in the same family.

Replacement Considerations

Check for direct equivalents such as the CDC337 series if industrial temperature ratings are needed. Verify pin compatibility and electrical specifications before substituting with other 1:8 TTL fanout buffers.