Microchip SY89846U Bruksanvisning
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SY89846U
1.5G Precision, LVPECL 1:5 Fanout with 2:1 Hz
MUX and Fail Safe Input with Internal
Termination
Precision Edge®
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • http://www.micrel.com--
Oct. 1, 2013
M9999-072211B
hbwhe[email protected] or (408) 955-1690
General Description
The SY89846U is a 2.5/3.3V, 1:5 LVPECL fanout
buer with a 2:1 dierential 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 dierential input drops signicantly
below 100mV).
The differential input includes Micrel’s unique, 3-pin
internal termination architecture that can interface to
any dierential 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 800mV, LVPECL with fast rise/fall times
guaranteed to be less than 250ps.
The SY89846U 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 –
SY89846U 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 5 precision
LVPECL 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
–< 900ps Propagation Delay (IN--toQ)
–< 250ps Rise/Fall times
Ultra-low jitter design:
–150fs RMS phase jitter (Typ)
–0.7psRMS 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% or 3.3 ±10% supply voltage
-40°C to +85°C industrial temperature range
Available in 32-pin (5mm x 5mm) QFN package
Applications
Fail-safe clock protection
SONET clock distribution
Backplane distribution
Markets
LAN/WAN
Enterprise servers
ATE
Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | SY89846U |
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