SY89838U
SY89838U is Precision 1:8 LVDS Clock Fanout Buffer manufactured by Micrel Semiconductor.
Description
The SY89838U is a low jitter, low skew, high-speed 1:8 fanout buffer with a unique, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89838U unique 2:1 Runt Pulse Eliminator (RPE) 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 DC voltage (voltage between the pins of the differential input drops below 200m V). The SY89838U 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 (400Mv PP) without any level shifting or termination resistor networks in the signal path. The outputs are 350m V patible LVDS with fast rise/fall times guaranteed to be less than 150ps.
The SY89838U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of
- 40°C to +85°C. For applications that require 800m V LVPECL outputs, consider the SY89837U. The SY89838U is part of Micrel’s high-speed, Precision Edge® product line.
All support documentation can be found on Micrel’s web site at: .micrel..
Features
Precision Edge®
- Selects between two clocks, and provides 8 precision, low skew LVDS output copies
- 2:1 MUX input provides a glitch-free, stable LVDS output
- Guaranteed AC performance over temperature and supply voltage:
- Wide operating frequency: 1k Hz to >1.5GHz
- <150ps tr/tf
- <40ps output-to-output skew
- Unique patent-pending input isolation design minimizes crosstalk
- Fail-safe input prevents oscillation
- Ultra-low jitter design:
- 150fs RMS phase jitter
- <0.7ps RMS MUX crosstalk induced jitter
- Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL,...
