Microchip SY89218U Bedienungsanleitung
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SY89218U
Precision 1:15 LVDS Fanout Buffer with 2:1
MUX and Four ÷1/÷2/÷4 Clock Divider Output
Banks
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
M9999-082407-
C
[email protected] or (408) 955-1690
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 LV
DS output ba
nks with ind
epend
ently
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 registeredtrademark of Micrel, Inc.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY89218U |
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