SY100S811

The SY100S811 is a low skew 1-to-9 PECL differential driver designed for clock distribution in new, highperformance PECL systems. SY100S811 accepts either a PECL clock input or a TTL input by using the TTL enable pin TEN. When the TTL enable pin is HIGH, the TTL input is enabled and the PECL input is disabled. When the enable pin is set LOW, the TTL input is disabled and the PECL input is enabled.

The SY100S811 is specifically designed and produced for low skew. The interconnect scheme and metal layout are carefully optimized for minimal gate-to-gate skew within the device. Wafer characterization and process control ensure consistent distribution of propagation delay from lot to lot. Since the SY100S811 shares a common set of "basic" processing with the other members of the ECLinPS family, wafer characterization at the point of device personalization allows for tighter control of parameters, including propagation delay.

To ensure that the skew specification is met, SY100S811 is necessary that both sides of the differential output are terminated into 50Ω, even if only one side is being used. ln most applications, all nine differential pairs will be used and, therefore, terminated. In the case where fewer than nine pairs are used, SY100S811 is necessary to terminate at least the output pairs on the same package side (i.e. sharing the same VCCO as the pair(s) being used on that side) in order to maintain minimum skew.

The VBB output of SY100S811 is intended for use as a reference voltage for single-ended reception of PECL signals to that device only. When using VBB for this purpose, it is recommended that VBB is decoupled to VCC via a 0.01µF capacitor.