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SY89871U
Microchip SY89871U Handleiding
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SY89871U
2.5GHz Any Diff. In-To-LVPECL
Programmable Clock Divider/Fanout Buffer
w/ Internal Termination
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Oct. 1, 2013
M9999-010512-F
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89871U is a 2.5V/3.3V LVPECL output precision
clock divider capable of accepting a high-speed differential
clock input (AC or DC-coupled) CML, LVPECL, HSTL or
LVDS clock input signal and dividing down the frequency
using a programmable divider ratio to create a frequency-
locked lower speed version of the input clock (Bank B).
Available divider ratios are 2, 4, 8, and 16. In a typical
622MHz clock system this would provide availability of
311MHz, 115MHz, 77MHz, or 38MHz auxiliary clock
components.
The differential input buffer has a unique internal
termination design that allows access to the termination
network through a VT pin. This feature allows the device to
easily interface to different logic standards. A V
REF-AC
reference is included for AC-coupled applications.
The SY89871U includes two phase-matched output banks.
Bank A (QA) is a frequency-matched copy of the input.
Bank B (QB0, QB1) is a divided down output of the input
frequency. Bank A and Bank B maintain a matched delay
independent of the divider setting.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Typical Performance
Precision Edge
®
Features
Two matched-delay outputs:
- Bank A: undivided pass-through (QA)
- Bank B: programmable divide by 2, 4, 8, 16 (QB0,
QB1)
Matched delay: all outputs have matched delay,
independent of divider setting
Guaranteed AC performance:
- >2.5GHz f
MAX
- <250ps t
r
/t
f
- <670ps t
pd
(matched delay)
- <15ps within-device skew
Low jitter design
- 231fs RMS phase jitter (Typ)
Power supply 3.3V or 2.5V
Unique patent-pending input termination and VT pin for
DC- and AC- coupled inputs: any differential inputs
(LVPECL, LVDS, CML, HSTL)
TTL/CMOS inputs for select and reset
100K EP compatible LVPECL outputs
Parallel programming capability
Wide operating temperature range: -40°C to +85°C
Available in 16-pin (3mm x 3mm) QFN package
Applications
OC-3 to OC-192 SONET/SDH applications
Transponders
Oscillators
SONET/SDH line cards
Precision Edge is a registered trademark of Micrel, Inc
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Specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | SY89871U |