Microchip SY89468U Bedienungsanleitung
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SY89468U
Precision LVDS 1:20 Fanout with 2:1 MUX
and Internal Termination with Fail-Safe Input
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2008
M9999-110308-D
[email protected] or (408) 955-1690
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 (200mV
PP
) 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:
–<1ps
RMS
random jitter
–<1ps
RMS
cycle-to-cycle jitter
–<10ps
PP
total jitter (clock)
–<0.7ps
RMS
MUX crosstalk induced jitter
∑Unique, patented MUX input isolation design
minimizes adjacent channel crosstalk
∑Unique, patented internal termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
∑Wide input voltage range VCC to GND
∑2.5V ±5% supply voltage
∑-40°C to +85°C industrial temperature range
∑Available in 64-pin EPAD-TQFP package
Applications
∑Fail-safe clock protection
∑Ultra-low jitter LVDS clock or data distribution
∑Rack-based Telecom/Datacom
Markets
∑LAN/WAN
∑Enterprise servers
∑ATE
∑Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY89468U |
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