SY89112U Datasheet | Micrel Semiconductor

2.5/3.3V Low-Jitter, Low-Skew 1:12 LVPECL Fanout Buffer with 2:1 Input MUX and Internal Termination General Description The SY89112U is a low-jitter, low-skew, high-speed LVPECL 1:12 differential fanout buffer optimized for precision tele and enterprise server distribution applications. The input includes a 2:1 MUX for clock switchover application. Unlike other multiplexers, this input includes a unique isolation design to minimize channel-tochannel crosstalk. The SY89112U distributes clock frequencies from DC to >2GHz guaranteed over temperature and voltage. The SY89112U incorporates a synchronous output enable (EN) so that the outputs will only be enabled/disabled when they are already in the LOW state. This reduces the chance of generating “runt” clock pulses. The SY89112U differential input includes Micrel’s unique, patent-pending 3-pin input termination architecture that directly interfaces to any differential signal (AC- or DCcoupled) as small as 100m V (200m Vpp) without any level shifting or termination resistor networks in the signal path. For AC-coupled input interface, an on-board output reference voltage (VREF-AC) is provided to bias the center-tap (VT) pin. The outputs are 800m V, 100Kpatible LVPECL with fast rise/fall times guaranteed to be less than 220ps. The SY89112U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of - 40°C to +85°C. The SY89112U is part of Micrel’s high-speed, Precision Edge® product line. Datasheets and support documentation are available on Micrel’s web site at: .micrel.. Features - Selects between 1 of 2 inputs, and provides 12 precision, low skew LVPECL output copies - Guaranteed AC performance over temperature and voltage: - DC to >2GHz throughput - <550ps propagation delay CLK-to-Q - <220ps rise/fall time - <25ps output-to-output skew - Ultra-low jitter design: - 50fs RMS phase jitter (typ.) - <0.7ps RMS crosstalk induced jitter - Unique,...