SY89202U_10 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – Precision 1:8 LVPECL Fanout Buffer with

SY89202U
Precision 1:8 LVPECL Fanout Buffer with
Three ÷1/÷2/÷4 Clock Divider Output Banks
General Description
The SY89202U is a precision, high-speed, integrated clock
divider LVPECL fanout buffer capable of handling clocks
up to 1.5GHz. Optimized for communications applications,
the three independently controlled output banks are phase
matched and can be configured for pass-through (÷1), ÷2
or ÷4 divide ratios.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the user to interface to
any AC- or DC-coupled signal 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 800mV, 100k compatible LVPECL, with
extremely fast rise/fall times guaranteed to be less than
220ps.
The EN (enable) input guarantees that the ÷1, ÷2 and ÷4
outputs will start from the same state without any runt
pulse after an asynchronous MR (master reset) is
asserted. This is accomplished by enabling the outputs
after a four-clock delay to allow the counters to
synchronize.
The SY89202U is part of Micrel’s Precision Edge^® product
family.
Datasheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
Precision Edge^®
Three low-skew LVPECL output banks with
programmable ÷1, ÷2 and ÷4 divider options
• Three independently programmable output banks
• Guaranteed AC performance over temp and voltage:
– >1.5GHz clock frequency (f_MAX)
– <930ps In-to-Out t_pd
– <220ps t_r/t_f
• Ultra-low jitter design:
– <1ps_RMS random jitter (RJ)
– <10ps_PP total jitter (clock)
• Internal input termination
• Patent-pending input termination and VT pin accepts
AC- and DC-coupled inputs (CML, PECL, LVDS)
• 800mV LVPECL output swing
• CMOS/TTL-compatible output enable (EN) and divider
select control
• Power supply 2.5V +5% or 3.3V +10%
• –40^oC to +85^oC industrial temperature range
• Available in 32-pin QFN package
Applications
• All SONET/SDH channel select applications
• All Fibre Channel multi-channel select applications
• All Gigabit Ethernet multi-channel select applications
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 [phone] • fax + 1 [phone] • http://www.micrel.com
August 2007
M9999-083107-C
[e-mail] or [phone]