MC10E211FN

Clock Buffers, Drivers Overview

The MC10E211FN is a low skew 1:6 fanout differential clock distribution chip from onsemi. It features multiplexed clock inputs for distributing high-speed system clocks and lower-speed scan/test clocks. 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 700 MHz, typical propagation delay of 745 ps (CLK to Q diff), and guaranteed part-to-part skew of 50 ps. It operates within a temperature range of 0°C to +85°C and is housed in a PLCC-28 package.

Clock Buffers, Drivers Feature Summary

• Multiplexed clock input allows selection between differential CLK and single-ended SCLK via the SEL pin.
• Synchronous enabling/disabling with common (CEN) and individual (ENx) controls prevents runt pulse generation.
• Internal 75 kΩ pulldown resistors on inputs ensure defined states when pins are left open.
• Dedicated VBB output provides an internally generated reference voltage for single-ended input configurations.

Clock Buffers, Drivers Applications

• Low skew clock distribution trees in high-speed digital systems.
• System diagnostics and self-test procedures requiring scan or test clock distribution.
• Fault-tolerant designs utilizing individual output enables to disable specific backplane cards.

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix to confirm packaging type. The 'FN' suffix indicates a PLCC-28 tube containing 37 units. The 'FNR2' suffix denotes a tape and reel containing 500 units. Confirm RoHS compliance requirements, as 'G' suffixes indicate lead-free packages. Ensure power supply connections for all VCC, VCCO, and VEE pins are established to guarantee proper operation.

Clock Buffers, Drivers Selection Notes

Select the MC10E211FN when a 1:6 fanout with tight skew specifications is required. Use this device instead of the E111 if lower fanout and higher bandwidth output transistors are needed for faster edge rates. Choose the 10 series (MC10E...) for standard operation or the 100 series (MC100E...) if temperature compensation is necessary. Ensure the application can accommodate the required termination schemes for unused outputs to maintain skew performance.

Clock Buffers, Drivers Part Context

The MC10E211 is part of the ECLinPS family, designed specifically for clock distribution applications. It complements the MC10E111 by providing a secondary level of distribution with individual enable capabilities. The device is characterized for operation up to 700 MHz and is intended for use in conjunction with other ECL logic devices to build complex clock networks.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing clock tree architectures when considering alternative components.

Clock Buffers, Drivers FAQ

How does the device handle open differential clock inputs?

All input pins have internal pulldown resistors. If differential CLK inputs are left open, the gate current source transistor may saturate, leading to undefined outputs. It is recommended to select the SCLK input if the differential CLK inputs are allowed to float.

What is the recommended handling for unused outputs?

To minimize noise and maintain skew performance, unused output pairs (true and complement) should be terminated in pairs. Leaving them unterminated can influence propagation delay on adjacent pins by 15 ps to 20 ps.

Can the MC10E211 be used with single-ended inputs?

Yes, but it requires connecting the unused differential input to the VBB pin as a switching reference. For AC-coupled inputs, the dependence on the VBB centering is removed, allowing the use of differential AC specification limits.