MC100LVEL/100EL14 is a low-skew 1:5 clock distribution chip designed specifically for low-skew clock distribution applications. The device can be driven by either a differential or single-ended ECL or, if positive power supplies are used, PECL input signal. The LVEL14 is functionally and pin compatible with the EL14, but is designed to operate in ECL or PECL mode for a voltage supply range of –3.0V to –3.8V ( or 3.0V to 3.8V). If a single-ended input is to be used, the VBB output should be connected to the CLK input and bypassed to ground via a 0.01µF capacitor. The VBB output is designed to act as the switching reference for the input of the LVEL14 under single-ended input conditions, as a result this pin can only source/sink up to 0.5mA of current. The LVEL14 features a multiplexed clock input to allow for the distribution of a lower speed scan or test clock along with the high speed system clock. When LOW (or left open and pulled LOW by the input pulldown resistor) the SEL pin will select the differential clock input. The common enable (EN) is synchronous so that the outputs will only be enabled/disabled when they are already in the LOW state. This avoids any chance of generating a runt clock pulse when the device is enabled/disabled as can happen with an asynchronous control. The internal flip flop is clocked on the falling edge of the input clock, therefore all associated outputs must be clocked on the rising edge of the clock.
The document describes the MC10EL14 and MC100EL14, which are low skew 1:5 clock distribution chips designed for applications requiring precise timing. These devices can be driven by differential or single-ended ECL signals, or PECL inputs if positive power supplies are used. The chip features a multiplexed clock input to distribute lower speed scan or test clocks alongside high-speed system clocks.
| Output-to-Output Skew | 50ps |
|---|---|
| Internal Input Pulldown Resistors | 75kQ |
| ESD Protection | >2000V |
| VEE Operating Range (100EL Series) | -4.20V to -5.50V |
| Operating Temperature Range | -40 to +85 C |
Yes, if positive power supplies are used, it can accept PECL input signals.
It selects between the differential clock input and the scan clock input.