sy89473u Micrel Semiconductor, sy89473u Datasheet

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sy89473u

Manufacturer Part Number
sy89473u
Description
Sy89473u Precision Lvpecl 2 1 Multiplexer With 1 2 Fanout And Internal Termination
Manufacturer
Micrel Semiconductor
Datasheet

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Part Number:
sy89473uMG
Manufacturer:
MICREL
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Part Number:
sy89473uMGTR
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General Description
The SY89473U is a 2.5V/3.3V precision, high-speed 2:1
differential MUX capable of processing clocks up to
2.5GHz and data up to 2.5Gbps.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that directly interfaces to
any differential signal (AC- or DC-coupled) as small as
100mV (200mV
termination resistor networks in the signal path. The
output is 800mV, 100K-compatible, LVPECL with fast
rise/fall times guaranteed to be less than 190ps.
The SY89473U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. The SY89473U is
part of Micrel’s high-speed, Precision Edge
line. For multiple-clock switchover solutions, please refer
to the SY89840–SY89843U family.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Functional Block Diagram
May 2007
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
PP
) without any level shifting or
®
product
Precision LVPECL 2:1 Multiplexer with 1:2
Features
• Selects between two input channels and provides two
• Guaranteed AC performance over temperature and
• Unique patented input isolation design minimizes
• Ultra-low Jitter Design:
• Unique patent-pending input termination and VT pin
• 800mV (100K) LVPECL output swing
• 2.5V ±5% or 3.3V ±10% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 24-pin (4mm x 4mm) MLF
Applications
• Clock switchover
• Data distribution
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
copies of the selected output
supply voltage:
- DC to 2.5Gbps data throughput
- DC to 2.5GHz f
- <500ps In-to-Out t
- <190ps t
- <20ps Output-to-output skew
crosstalk
- <1ps
- <1ps
- <10ps
- <0.7ps
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
Fanout and Internal Termination
RMS
RMS
PP
RMS
r
random jitter
cycle-to-cycle jitter
total jitter (clock)
/t
f
crosstalk induced jitter
SY89473U
MAX
hbwhelp@micrel.com
pd
(clock)
Precision Edge
®
or (408) 955-1690
M9999-052207-B
package
®

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sy89473u Summary of contents

Page 1

... The SY89473U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY89473U is part of Micrel’s high-speed, Precision Edge line. For multiple-clock switchover solutions, please refer to the SY89840– ...

Page 2

... Ordering Information Part Number Package Type SY89473UMG MLF-24 (2) SY89473UMGTR MLF-24 Notes: 1. Contact factory for die availability. Dice are guaranteed Tape and Reel. Pin Configuration May 2007 Operating Package Marking Range Industrial 473U with Pb-Free bar-line indicator Industrial 473U with Pb-Free bar-line indicator = 25° ...

Page 3

Pin Description Pin Number Pin Name 5, 2, IN0, /IN0 23, 20 IN1, /IN1 VREF-AC0 3, 21 VREF-AC1 4, 22 VT0 VT1 , 10, 13, VCC 19 Q0, /Q0 11, 12 Q1, /Q1 15 ...

Page 4

Absolute Maximum Ratings Supply Voltage (V ) .................................... -0.5V to +4.0V CC Input Voltage (V ) ........................................... -0. LVPECL Output Current (I ) OUT Continuous ...........................................................±50mA Surge ..................................................................±100mA Input Current Source/sink Current on IN, /IN..............................±50mA Source/sink Current ...

Page 5

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 V OUT Differential Output ...

Page 6

AC Electrical Characteristics V = 2.5V ±5% or 3.3V ±10 Symbol Parameter f Maximum Operating Frequency MAX t Differential Propagation Delay pd In-to-Q SEL-to-Q T Differential Propagation Delay pd Tempco Temperature Coefficient t Output-to-Output Skew SKEW Part-to-Part Skew ...

Page 7

Typical Operating Characteristics V = 3.3V; V > 400mV 25° Functional Characteristics V = 3.3V; V > 400mV 25° May 2007 = 50Ω -2V, unless otherwise ...

Page 8

Single-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Timing Diagrams Input and Output Stages Figure 2a. Simplified Differential Input Stage May 2007 Figure 1b. Differential Voltage Swing Figure 2b. Simplified LVPECL Output Stage 8 hbwhelp@micrel.com M9999-052207-B or (408) 955-1690 ...

Page 9

Input Interface Applications Figure 3a. LVPECL Interface (DC-Coupled) Figure 3d. CML Interface (AC-Coupled) May 2007 Figure 3b. LVPECL Interface (AC-Coupled) Figure 3e. LVDS Interface (DC-Coupled) 9 Option: may connect Figure 3c. CML Interface (DC-Coupled) M9999-052207-B ...

Page 10

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

Page 11

Package Information 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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