SY89468UHY

SY89468U Precision LVDS 1:20 Fanout with 2:1 MUX and Internal Termination with Fail-Safe Input General Description The SY89468U is a 2.5V, 1:20 LVDS fanout buffer with a 2:1 differential input multiplexer (MUX). A unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops significantly below 100mV). The differential input includes Micrel’s unique, 3-pin internal termination architecture that can interface to any differential signal (AC- or DC-coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The outputs are LVDS compatible with very fast rise/fall times guaranteed to be less than 270ps. The SY89468U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY89468U 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. Functional Block Diagram ® Precision Edge Features ∑ Selects between two inputs, and provides 20 precision LVDS copies ∑ Fail-Safe Input – Prevents outputs from oscillating when input is invalid ∑ Guaranteed AC performance over temperature and supply voltage: – DC to >1.5GHz throughput – < 1200ps Propagation Delay (In-to-Q) – < 270ps Rise/Fall times ∑ Ultra-low jitter design: –