SY89218U_0708 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – YPrecision 1:15 LVDS Fanout Buffer with 2:1

SY89218U
Precision 1:15 LVDS Fanout Buffer with 2:1
MUX and Four ÷1/÷2/÷4 Clock Divider Output
Banks
General Description
The SY89218U is a 2.5V precision, high-speed,
integrated clock divider and LVDS fanout buffer capable
of handling clocks up to 1.5GHz. Optimized for
communications applications, the four independently
controlled output banks are phase-matched and can be
configured for pass through (÷1), ÷2 or ÷4 divider ratios.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows the user to
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
low-skew, low-jitter outputs are LVDS compatible with
extremely fast rise/fall times guaranteed to be less than
200ps.
The /MR (master reset) input asynchronously resets the
outputs. A four-clock delay after de-asserting /MR allows
the counters to synchronize and start the outputs from
the same state without any runt pulse.
The SY89218U is part of Micrel’s Precision Edge^®
product family. All support documentation can be found
at Micrel's web site at: www.micrel.com.
Features
• Low-skew LVDS output banks with independently
programmable ÷1, ÷2 and ÷4 divider options
• Four output banks, 15 total outputs
• Guaranteed AC performance over temperature and
voltage:
– Accepts a clock frequency up to 1.5GHz
– <1600ps IN-to-OUT propagation delay
– <200ps rise/fall time
– <35ps within bank skew
• Fail Safe Input
– Prevents outputs from oscillating
• Ultra-low jitter design:
– <1ps_RMS random jitter
– <10ps_PP total jitter (clock)
• Patent-pending input termination and VT pin accepts
DC- and AC-coupled inputs (CML, PECL, LVDS)
• LVDS-compatible outputs
• CMOS/TTL-compatible output enable (EN) and
divider select control
• 2.5V ±5% power supply
• –40°C to +85°C temperature range
• Available in 64-pin TQFP
Applications
• All SONET/SDH applications
• All Fibre Channel applications
• All Gigabit Ethernet applications
Markets
• LAN/WAN routers/switches
• Storage
• ATE
• Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
August 2007
M9999-082407-C
[e-mail] or [phone]