The MC100ES6221 is designed for low skew clock distribution systems and supports clock frequencies up to 2 GHz. The device accepts two clock sources. The CLK0 input can be driven by ECL or PECL compatible signals, the CLK1 input accepts HSTL compatible signals. The selected input signal is distributed to 20 identical, differential ECL/PECL outputs. If VBB is connected to the CLK0 or CLK1 input and bypassed to GND by a 10 nF capacitor, the MC100ES6221 can be driven by single-ended ECL/PECL signals utilizing the VBB bias voltage output.