Microchip SY89221U Bedienungsanleitung
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Micrel Inc. • 2180 Fortu
ne 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
or (408) 955-1690
SY89221U
Precision 1:15 LVPECL Fanout Buffer with
2:1 MUX and Four ÷1/÷2/÷4 Clock Divider
Output Banks
General Description
The SY89221
U is a 2.5/3.3V precision, high-speed,
integrated clock divider and LVPECL 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 LVPECL
compatible with extremely fast rise/fall times that are
guaranteed to be less than 220ps.
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 SY89221U 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
•
Four low-skew LVPECL output banks
with
independ
entl
y
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
–<270ps rise/fall time
–<35 ps within-bank skew
•Fail Safe Input
–Prevents outputs from oscillating
•Ultra-low jitter design:
– <1p
s
RMS
random jitter
– <10ps
PP
total jitter (clock)
•Patent-pending input termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
•CMOS/TTL-compatible output enable (EN) and
divider sele
ct cont
rol
•2.5V ±5% or 3.3V ±10% 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
•Enterprise servers
•Storage
•ATE
•Test and measurement
Precision Edge is a registeredtrademark of Micrel, Inc.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY89221U |
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