SY89837UMI TR Micrel Inc, SY89837UMI TR Datasheet

SY89837UMI TR

Manufacturer Part Number

SY89837UMI TR

Description

Manufacturer

Micrel Inc

Type

Clock Driverr

Datasheet

1.SY89837UMI_TR.pdf (14 pages)

Specifications of SY89837UMI TR

Number Of Clock Inputs

Mode Of Operation

Differential

Output Frequency

2000MHz

Output Logic Level

LVPECL

Operating Supply Voltage (min)

2.375V

Operating Supply Voltage (typ)

2.5/3.3V

Operating Supply Voltage (max)

3.6V

Package Type

MLF

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Signal Type

CML/LVDS/PECL

Mounting

Surface Mount

Pin Count

Lead Free Status / RoHS Status

Not Compliant

Current page: 1 of 14
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M9999-060410

hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc.

■ Selects between two clocks, and provides 8

■ Guaranteed AC performance over temperature and

■ Wide operating frequency: 1kHz to >1.5GHz

• <975ps in-to-out t

• <180ps t

• <40ps output-to-output skew

■ Unique input isolation design minimizes crosstalk

■ Ultra-low jitter design:

• <1ps

• <10ps

• <0.7ps

■ Unique input termination and VT pin accepts DC- or

■ 800mV LVPECL output swing

■ Power supply +2.5V ±5% or +3.3V ±10%

■ –40°C to +85°C industrial temperature range

■ Available in 32-pin (5mm x 5mm) MLF

■ Redundant clock distribution

■ Fail-safe clock protection

Precision Edge is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

FEATURES

APPLICATIONS

precision, low skew LVPECL output copies

supply voltage:

AC-coupled inputs (CML, PECL, LVDS)

rms

random jitter

cycle-to-cycle jitter

total jitter (clock)

MUX crosstalk induced jitter

PRECISION 1:8 LVPECL FANOUT

BUFFER WITH 2:1 RUNT PULSE

ELIMINATOR INPUT MUX

package

fanout buffer with a unique, 2:1 differential input multiplexer

(MUX) optimized for clock redundant switchover applications.

Unlike standard multiplexers, the SY89837U unique 2:1 runt

pulse eliminator (RPE) input MUX prevents any short cycles

or “runt” pulses during switchover. In addition, a unique

fail-safe input protection prevents metastable conditions

when the selected input clock fails to a static DC differential

voltage (differential input voltage drops below 200mV).

The SY89837U distributes clock frequencies from 1kHz to

1.5GHz, guaranteed, over temperature and voltage.

termination architecture that allows customers to interface

to any differential signal (AC- or DC-coupled) as small as

200mV without any level shifting or termination resistor

networks in the signal path. The outputs are 800mV, 100k

compatible LVPECL with fast rise/fall times guaranteed to

be less than 200ps.

supply and is guaranteed over the full industrial temperature

range of –40°C to +85°C. The SY89837U is part of Micrel’s

high-speed, Precision Edge

site at: www.micrel.com.

DESCRIPTION

The SY89837U is a low jitter, low skew, high-speed 1:8

The differential input includes Micrel’s unique, 3-pin input

The SY89837U operates from a +2.5V ±5% or +3.3V ±10%

All support documentation can be found on Micrel’s web

product line.

Precision Edge

Rev.: F

Issue Date: June 2010

Precision Edge

SY89837U

Amendment: /0

SY89837U

Related parts for SY89837UMI TR

SY89837UMI TR Summary of contents

Page 1

Micrel, Inc. FEATURES ■ Selects between two clocks, and provides 8 precision, low skew LVPECL output copies ■ Guaranteed AC performance over temperature and supply voltage: ■ Wide operating frequency: 1kHz to >1.5GHz • <975ps in-to-out t pd • <180ps ...

Page 2

Micrel, Inc. TYPICAL APPLICATIONS CIRCUIT Figure 1. Simplified Example Illustrating Runt Pulse Eliminator (RPE) TRUTH TABLE Inputs IN0 /IN0 IN1 /IN1 M9999-060410 hbwhelp@micrel.com or (408) 955-1690 Circuit When Primary Clock Fails Outputs SEL Q ...

Page 3

Micrel, Inc. PACKAGE/ORDERING INFORMATION ® 32-Pin MLF (MLF-32) PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 3, IN0, /IN0, Differential Inputs: These input pairs are the differential signal inputs to the device. These inputs 6, 8 IN1, /IN1 accept AC- or DC-coupled signals as ...

Page 4

Micrel, Inc. DETAILED FUNCTIONAL DESCRIPTION RPE MUX and Fail-Safe Input The SY89837U is optimized for clock switchover applications where switching from one clock to another clock without runt pulses (short cycles) is required. It features two unique circuits: 1. Runt-Pulse Eliminator (RPE) Circuit The RPE MUX ...

Page 5

Micrel, Inc. Case #2 Input Clock Failure: Switching from a selected clock stuck HIGH to a valid clock (RPE enabled). If CLK1 fails HIGH before the RPE MUX selects CLK2 (using the SEL pin), the switchover will occur in three ...

Page 6

Micrel, Inc. Case #4 Input Clock Failure: Switching from the selected clock input stuck in an undetermined state to a valid clock input (RPE enabled). If the selected input clock fails to a floating, static, or extremely low signal swing, ...

Page 7

Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V ) ....................................–0.5V to +4.0V CC Input Volage (V ) ............................................–0. LVPECL Output Current (I ) OUT ............................................................................. Continuous ...................................................................................... Surge (3) Termination Current ...................................... Source or sink current ...

Page 8

Micrel, Inc. LVPECL OUTPUTS DC ELECTRICAL CHARACTERISTICS V = +2.5V ±5% or +3.3V ±10 50Ω Symbol Parameter V Output HIGH Voltage Output LOW Voltage Output Voltage Swing OUT Q, ...

Page 9

Micrel, Inc. AC ELECTRICAL CHARACTERISTICS V = +2.5V ±5% or +3.3V ±10 –40°C to +85°C; unless noted Symbol Parameter f Maximum Operating Frequency MAX t Differential Propagation Delay pd t tempco Differential Propagation Delay pd ...

Page 10

Micrel, Inc. OPERATING CHARACTERISTICS Propagation Delay Variation vs. Input Rise/Fall Time 1000 t (max) pd 900 800 700 600 500 400 300 200 V = 200mV IN 100 0 0 100 200 300 INPUT RISE/FALL TIME (ps) Propagation Delay Variation ...

Page 11

Micrel, Inc. OPERATING CHARACTERISTICS (CONTINUED) M9999-060410 hbwhelp@micrel.com or (408) 955-1690 11 ® Precision Edge SY89837U ...

Page 12

Micrel, Inc. 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) M9999-060410 hbwhelp@micrel.com or (408) 955-1690 Figure 2b. Simplified LVPECL Output Stage Figure 3b. LVPECL Interface (AC-Coupled) Figure 3e. LVDS Interface 12 ® Precision Edge SY89837U Option: may connect ...

Page 13

Micrel, Inc. LVPECL OUTPUT INTERFACE APPLICATIONS Figure 4a. Parallel Thevenin-Equivalent Termination RELATED PRODUCT AND SUPPORT DOCUMENTATION Part Number Function ® MLF Application Note HBW Solutions New Products and Applications M9999-060410 hbwhelp@micrel.com or (408) 955-1690 Figure 4b. Parallel Termination (3-Resistors) Data Sheet Link www.amkor.com/product/notes_papers/MLFAppNote.pdf www.micrel.com/product-info/products/solutions.shtml 13 ® Precision Edge SY89837U ...

Page 14

Micrel, Inc. ® 32-PIN MicroLeadFrame (MLF-32) Package Notes: 1. Package meets Level 2 Moisture Sensitivity Classification. 2. All parts are dry-packaged before shipment. 3. Exposed pads must be soldered to a ground for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 tel The ...

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