SY89228UMG

SY89228U 1GHz Precision, LVPECL ÷3, ÷5 Clock Divider with Fail-Safe Input and Internal Termination General Description The SY89228U is a precision, low jitter 1GHz ÷3, ÷5 clock divider with an LVPECL output. A unique FailSafe Input (FSI) protection prevents metastable output conditions when the input clock voltage swing drops significantly below 100mV or input is removed. The differential input includes Micrel’s unique, 3-pin internal termination architecture that allows the input to interface to any differential signal (AC- or DCcoupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100Kcompatible LVPECL with fast rise/fall times guaranteed to be less than 270ps. The SY89228U 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 SY89228U is part of Micrel’s high-speed, Precision ® Edge product line. All support documentation can be found on Micrel’s web site at: www.micrel.com. Block Diagram Precision Edge ® Features • Accepts a high-speed input and provides a precision ÷3 and ÷5 sub-rate, LVPECL output • Fail-Safe Input – Prevents oscillations when input is invalid • Guaranteed AC performance over temperature and supply voltage: – DC-to >1.0GHz throughput – < 1500ps Propagation Delay (In-to-Q) – < 270ps Rise/Fall times • Ultra-low jitter design: –