MC100EL34D

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC100EL34D is a low skew clock generation chip designed for ÷2, ÷4, and ÷8 frequency division applications. It features synchronous internal dividers with precisely aligned common output edges. The device supports PECL mode (VCC = 4.2 V to 5.7 V, VEE = 0 V) and NECL mode (VCC = 0 V, VEE = −4.2 V to −5.7 V). Key electrical parameters include a maximum toggle frequency of 1.1 GHz, 50 ps typical output-to-output skew, and 100 ps maximum within-device skew. Power supply current is typically 39 mA at 25°C. The component is housed in an SOIC-16 package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Low skew performance with 50 ps typical output-to-output skew and 100 ps maximum within-device skew.
• Synchronous enable/disable functionality prevents runt clock pulses during state transitions.
• Master reset input allows synchronization of internal dividers and multiple devices in a system.
• Internal 75 kΩ pulldown resistors on CLK, EN, and MR inputs simplify interface design.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Low skew clock generation systems requiring precise edge alignment.
• Multi-stage divider circuits utilizing the Master Reset for system synchronization.
• PECL or NECL based high-speed digital logic designs.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix 'D' against the manufacturer's current documentation, as the datasheet lists 'MC100EL34DG' as discontinued. Confirm availability through authorized distributors or secondary market sources if new production is unavailable. Ensure compliance with RoHS requirements by checking for the 'G' suffix designation in procurement orders.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when low skew is critical for clock distribution networks. Ensure the power supply configuration matches either PECL (positive VCC) or NECL (negative VEE) requirements. Verify that the input swing meets the minimum VPP specification of 150 mV. Consider the thermal resistance of the SOIC-16 package under expected operating conditions.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MC100EL34 belongs to the MC10/100EL34 series of ECL clock generation chips. The '100' prefix indicates temperature compensation features included in the design. This family is distinct from other ECL logic families such as the MC10E series, offering specific synchronization capabilities via the Master Reset pin.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The datasheet explicitly states that the MC100EL34DG is discontinued and not recommended for new designs. Contact onsemi representatives for information on alternative devices or obsolescence management strategies.