CDC318ADLG4

Overview

The CDC318ADLG4 is a clock buffer and distribution IC manufactured by Texas Instruments. It functions as a 1-to-18 fanout buffer, accepting an LVTTL input signal and providing up to 18 LVTTL or TTL outputs. The device supports a maximum operating frequency of 100 MHz and requires a supply voltage range of 3.135 V to 3.465 V. It is housed in a 48-BSSOP (7.50 mm width) surface-mount package with a tube packaging style. The component operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• 1-to-18 Fanout Distribution: Converts one input line into eighteen output lines for clock distribution.
• High-Speed Operation: Supports clock frequencies up to 100 MHz.
• Logic Compatibility: Accepts LVTTL inputs and drives LVTTL/TTL loads.
• Standard Packaging: Available in a 48-pin SSOP tube package.

Applications

• Clock distribution networks requiring high fanout ratios.
• Digital systems utilizing LVTTL/TTL logic families.
• Embedded hardware designs operating within standard commercial temperature ranges.

Procurement Notes

Verify the specific ordering suffix 'G4' against the manufacturer's current documentation to confirm compliance status and pin compatibility. Ensure the design accommodates the narrow 3.135 V to 3.465 V supply voltage window. Confirm that the 48-SSOP package dimensions fit the target PCB footprint constraints.

Selection Notes

Select this component when a single clock source must drive multiple LVTTL/TTL destinations without buffering amplification. The fixed 1:18 ratio limits flexibility compared to programmable drivers. Verify that the system power supply can maintain stability within the specified 3.135 V to 3.465 V range to ensure correct logic threshold operation.

Part Context

This part belongs to the Texas Instruments clock buffer family. It serves as a passive distribution element rather than a programmable synthesizer. The 'G4' suffix typically indicates lead-free manufacturing compliance, though verification with official datasheets is required. It complements active clock generators by handling load distribution.

Replacement Considerations

Direct replacements must match the 1:18 ratio, 48-SSOP package, and LVTTL/TTL I/O levels. Check for equivalent parts from other manufacturers offering identical pinouts and electrical specifications. Verify if alternative packages like SOIC are available if board space allows.