SY100EL15L Datasheet | Micrel Semiconductor

Micrel, Inc. 3.3V 1:4 CLOCK DISTRIBUTION Precision Edge® Precision SYE1d00g Ee L®15L Features s 3.3V power supply s 50ps output-to-output skew s Low power s Synchronous enable/disable s Multiplexed clock input s 75KΩ internal input pull-down resistors s Available in 16-pin SOIC package PIN NAMES Pin CLK SCLK EN SEL VBB Q0-3 Function Differential Clock Inputs Synchronous Clock Input Synchronous Enable Clock Select Input Reference Output Differential Clock Outputs Precision Edge® DESCRIPTION The SY100EL15L is a low skew 1:4 clock distribution IC designed explicitly 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. 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 EL15 under singleended input conditions. As a result, this pin can only source/sink up to 0.5m A of current. The EL15 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 pull-down resistor) the SEL pin will select the differential clock input. The mon 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 specification limits are referenced to the negative edge of the clock input. When both differential inputs are left open, CLK input will pull down to VEE and CLK input will bias around VCC/2. TRUTH TABLE SCLK L XL H XL X LH X HH X XX - On next negative...