SY89837U Datasheet | Micrel Semiconductor

Micrel, Inc. PRECISION 1:8 LVPECL FANOUT BUFFER WITH 2:1 RUNT PULSE ELIMINATOR INPUT MUX Precision Edge® Precision ESd Y8g9e8®37U SY89837U Features - Selects between two clocks, and provides 8 precision, low skew LVPECL output copies - Guaranteed AC performance over temperature and supply voltage: - Wide operating frequency: 1k Hz to >1.5GHz - <975ps in-to-out tpd - <180ps tr/tf - <40ps output-to-output skew - Unique input isolation design minimizes crosstalk - Ultra-low jitter design: - 150fs RMS phase jitter - <0.7psrms MUX crosstalk induced jitter - Unique input termination and VT pin accepts DC- or AC-coupled inputs (CML, PECL, LVDS) - 800m V LVPECL output swing - Power supply +2.5V ±5% or +3.3V ±10% - - 40°C to +85°C industrial temperature range - Available in 32-pin (5mm x 5mm) QFN package APPLICATIONS - Redundant clock distribution - Fail-safe clock protection Precision Edge® DESCRIPTION The SY89837U is a low jitter, low skew, high-speed 1:8 fanout buffer with a unique, 2:1 differential input multiplexer (MUX) optimized for clock redundant switchover applications. Unlike standard multiplexers, the SY89837U unique 2:1 runt pulse eliminator (RPE) input MUX prevents any short cycles or “runt” pulses during switchover. In addition, a unique fail-safe input protection prevents metastable conditions when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200m V). The SY89837U distributes clock frequencies from 1k Hz to 1.5GHz, guaranteed, over temperature and voltage. The differential input includes Micrel’s unique, 3-pin input termination architecture that allows customers to interface to any differential signal (AC- or DC-coupled) as small as 200m V without any level shifting or termination resistor networks in the signal path. The outputs are 800m V, 100k patible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V±5% or +3.3V±10% supply and is guaranteed...