sy89202u Micrel Semiconductor, sy89202u Datasheet

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sy89202u

Manufacturer Part Number
sy89202u
Description
Sy89202u Precision 1 8 Lvpecl Fanout Buffer With Three ?1/ ?2/ ?4 Clock Divider Output Banks
Manufacturer
Micrel Semiconductor
Datasheet

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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
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.
All support documentation can be found at Micrel’s
web site at:
June 2006
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology.
www.micrel.com
pp
) without any level shifting or
®
Three ÷1/÷2/÷4 Clock Divider Output Banks
Precision 1:8 LVPECL Fanout Buffer with
Features
• Three low-skew LVPECL output banks with
• Three independently programmable output banks
• Guaranteed AC performance over temp and
• Ultra-low jitter design:
• Internal input termination
• Patent-pending input termination and VT pin
• 800mV LVPECL output swing
• CMOS/TTL-compatible output enable (EN) and
• Power supply 2.5V +5% or 3.3V +10%
• –40
• Available in 32-pin MLF
Applications
• All SONET/SDH channel select applications
• All Fibre Channel multi-channel select applications
• All Gigabit Ethernet multi-channel select
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
programmable ÷1, ÷2 and ÷4 divider options
voltage:
– >1.5GHz clock frequency (f
– <930ps In-to-Out t
– <220ps t
– <1ps
– <10ps
accepts DC-coupled and AC-coupled inputs (CML,
PECL, LVDS)
divider select control
Applications
o
C to +85
RMS
PP
total jitter (clock)
r
random jitter (RJ)
/t
f
SY89202U
o
C industrial temperature range
hbwhelp@micrel.com
pd
®
package
MAX
)
Precision Edge
M9999-061206-B
or (408) 955-1690
®

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sy89202u Summary of contents

Page 1

... 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. All support documentation can be found at Micrel’s web site at: www.micrel.com Precision Edge is a registered trademark of Micrel, Inc ...

Page 2

Functional Block Diagram June 2006 2 hbwhelp@micrel.com M9999-061206-B or (408) 955-1690 ...

Page 3

... Contact factory for die availability. Dice are guaranteed Tape and Reel. Pin Configuration June 2006 Operating Package Marking Range Industrial SY89202U with Pb-Free bar-line indicator Industrial SY89202U with Pb-Free bar-line indicator = 25°C, DC Electricals Only. A ® 32-Pin MLF (MLF-32) 3 Lead Finish NiPdAu ...

Page 4

Pin Description Pin Number Pin Name DIVSEL1 DIVSEL2 DIVSEL3 3, 6 IN, / VREF- 10, 19, 22, 31 VCC 16, 15, 14, Q4, /Q4, Q5, /Q5, 13, 12, 11 Q6, /Q6 30, ...

Page 5

Absolute Maximum Ratings Supply Voltage (V ) .............................-0.5V to +4.0V CC Input Voltage (V ) .....................................-0. Termination Current Source or sink current Output Current Source or sink current on IN, /IN................ ±50mA V Current ...

Page 6

LVPECL Outputs DC Electrical Characteristics V = 2.5V ±5% or 3.3V ±10 Symbol Parameter V Output HIGH Voltage Output LOW Voltage Output Voltage Swing OUT Differential Output ...

Page 7

AC Electrical Characteristics V = 2.5V ±5% or 3.3V ±10 Symbol Parameter Maximum Output Toggle Frequency f MAX Maximum Input Frequency Differential Propagation Delay t pd /MR – Q Propagation Delay t Differential Propagation Delay pd Tempco Temperature ...

Page 8

Single-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Timing Diagrams IN, /IN / /MR asynchronously resets the outputs ÷1 Output ÷2 Output ÷4 Output Outputs go HIGH simultaneously after 4 complete input clock ...

Page 9

IN, / External ÷1 Output External ÷2 Output External ÷4 Output Outputs go HIGH simultaneously after EN is asserted. The number of IN clock cycles after EN is asserted before the outputs go HIGH varies from ...

Page 10

Typical Operating Characteristics Functional Characteristics June 2006 10 hbwhelp@micrel.com M9999-061206-B or (408) 955-1690 ...

Page 11

Input and Output Stages Figure 2a. Simplified Differential Input Stage Input Interface Applications Figure 3a. LVPECL Interface (DC-Coupled) Figure 3d. CML Interface (AC-Coupled) June 2006 Figure 2b. Simplified LVPECL Output Stage Figure 3b. LVPECL Interface (AC-Coupled) Figure 3e. LVDS Interface ...

Page 12

LVPECL Output Interface Applications LVPECL has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50Ω- and 100Ω-controlled impedance transmission lines. There are several techniques ...

Page 13

MicroLeadFrame MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no ...

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