MC100ES8111FA

Clock Buffers, Drivers Overview

The MC100ES8111 is a low-voltage, bipolar monolithic differential clock fanout buffer designed for high-performance clock distribution in computing, networking, and telecommunications systems. Utilizing SiGe technology, it provides a 1:10 split of precisely aligned differential clock signals with very low skew. The device accepts HSTL-compatible inputs on the CLK0 pair and PECL-compatible inputs on the CLK1 pair, distributing the selected signal to ten identical HSTL-compatible differential outputs. It operates at frequencies up to 625 MHz using a 3.3 V core supply and a 1.5 V or 1.8 V output supply.

Clock Buffers, Drivers Feature Summary

• 1:10 differential clock fanout buffer with maximum device skew of 80 ps
• Supports DC to 625 MHz operation of clock or data signals
• Dual input options: HSTL compatible (CLK0) and PECL compatible (CLK1)
• Open emitter architecture with 50 Ω DC termination to GND for minimal part-to-part skew

Clock Buffers, Drivers Applications

• High performance clock distribution in computing systems
• Clock distribution in networking equipment
• Clock distribution in telecommunication systems

Clock Buffers, Drivers Procurement Notes

Verify that the package matches the standard 32-lead LQFP (Case 873A-03). Confirm the specific ordering suffix corresponds to the required tape and reel or tube configuration, as these affect physical packaging but not electrical function. Ensure the component meets industrial temperature range requirements if operating outside standard commercial limits.

Clock Buffers, Drivers Selection Notes

Select this component when low skew and precise alignment are critical for distributing a single clock source to multiple destinations. Ensure the design accommodates the dual power supply requirement: 3.3 V for the core and either 1.5 V or 1.8 V for the HSTL outputs. Verify that the application can support the necessary 50 Ω DC termination to ground for all active differential output pairs to maintain specified timing characteristics.

Clock Buffers, Drivers Part Context

The MC100ES8111 belongs to the Advanced Clock Drivers family from Freescale Semiconductor (now NXP USA Inc.). It is specifically engineered for demanding clock distribution architectures where signal integrity and timing precision are paramount. The device leverages SiGe technology to achieve superior digital signal characteristics compared to standard CMOS alternatives.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. When evaluating potential replacements, ensure the alternative supports 1:10 differential fanout, maintains similar skew specifications (under 80 ps), and is compatible with both HSTL and PECL input standards.

Clock Buffers, Drivers FAQ

How should unused differential output pairs be terminated?

To maintain tight skew specifications, both outputs of any differential pair must be terminated identically with 50 Ω resistors to GND, even if only one side of the pair is used. If an entire bank of outputs is unused, it is recommended to leave them open and unterminated.

What is the function of the OE pin?

The OE (Output Enable) pin controls the state of the outputs. It is internally synchronized to the input reference clock to prevent the generation of output runt pulses. Outputs are disabled in the logic low state without changing output impedance.

Can the MC100ES8111 accept center voltage termination?

No, the device does not support output termination to VTT = VX = 0.75 V. It requires a 50 Ω DC termination to GND (0 V) for correct AC and DC operation.