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SY89229U Datasheet, PDF (1/16 Pages) Micrel Semiconductor – 1GHz Precision, LVDS ÷3, ÷5 Clock Divider with Fail Safe Input and Internal Termination | |||
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SY89229U
1GHz Precision, LVDS ÷3, ÷5 Clock Divider
with Fail Safe Input and Internal Termination
General Description
The SY89229U is a precision, low jitter 1GHz ÷3, ÷5
clock divider with an LVDS output. A unique Fail-
Safe 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 Micrelâs unique, 3-pin
internal termination architecture that allows the input
to 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 325mV, 100K-
compatible LVDS with fast rise/fall times guaranteed
to be less than 220ps.
The SY89229U operates from a 2.5V ±5% supply
and is guaranteed over the full industrial
temperature range of â40°C to +85°C. The
SY89229U is part of Micrelâs high-speed, Precision
Edge® product line.
All support documentation can be found on Micrelâs
web site at: www.micrel.com.
Block Diagram
Features
Precision Edge®
⢠Accepts a high-speed input and provides a precision
÷3 and ÷5 sub-rate, LVDS output
⢠Fail-Safe Input
â Prevents oscillations when input is invalid
⢠Guaranteed AC performance over temperature and
supply voltage:
â DC-to >1.0GHz throughput
â <1500ps Propagation Delay (In-to-Q)
â <220ps Rise/Fall times
⢠Ultra-low jitter design:
â <1psRMS random jitter
â <1psRMS cycle-to-cycle jitter
â <10psPP total jitter (clock)
â <0.7psRMS MUX crosstalk induced jitter
⢠Unique patented internal termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
⢠Wide input voltage range VCC to GND
⢠325mV LVDS output
⢠46% to 54% Duty Cycle(÷ 3)
⢠47% to 53% Duty Cycle(÷ 5)
⢠2.5V ±5% supply voltage
⢠-40°C to +85°C industrial temperature range
⢠Available in 16-pin (3mm x 3mm) QFN package
Applications
⢠Fail-safe clock protection
Markets
⢠LAN/WAN
⢠Enterprise servers
⢠ATE
⢠Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
August 2007
M9999-080707-A
hbwhelp@micrel.com or (408) 955-1690
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