SY89229UMG Micrel Inc, SY89229UMG Datasheet

Divide-by-3 And 5 LVDS Clock Divider With Internal Termination And FSI (1GHz)

SY89229UMG

Manufacturer Part Number

SY89229UMG

Description

Divide-by-3 And 5 LVDS Clock Divider With Internal Termination And FSI (1GHz)

Manufacturer

Micrel Inc

Series

Precision Edge®r

Type

Clock Dividerr

Datasheet

1.SY89229UMG.pdf (16 pages)

Specifications of SY89229UMG

Pll

Input

CML, LVDS, PECL

Output

LVDS

Number Of Circuits

Ratio - Input:output

1:1

Differential - Input:output

Yes/Yes

Frequency - Max

1GHz

Divider/multiplier

Yes/No

Voltage - Supply

2.375 V ~ 2.625 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

16-MLF®, QFN

Frequency-max

1GHz

Function

Clock Divider

Operating Temperature (max)

85C

Operating Temperature (min)

-40C

Package Type

MLF

Pin Count

Mounting

Surface Mount

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Compliant, Lead free / RoHS Compliant

Other names

576-1651-5

Current page: 1 of 16
Download datasheet (488Kb)

General Description

The SY89229U is a precision, low jitter 1GHz ÷3, ÷5

clock divider with an LVDS output. A unique Fail-

Safe Input (FSI) protection prevents metastable

output conditions when the input clock voltage swing

drops significantly below 100mV or input is removed.

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

internal termination architecture that allows the input

to interface to any differential signal (AC- or DC-

coupled) as small as 100mV (200mV

level shifting or termination resistor networks in the

signal path. The outputs are 325mV, 100K-

compatible LVDS with fast rise/fall times guaranteed

to be less than 220ps.

The SY89229U operates from a 2.5V ±5% supply

and

temperature range of –40°C to +85°C. The

SY89229U is part of Micrel’s high-speed, Precision

Edge

All support documentation can be found on Micrel’s

web site at: www.micrel.com.

Block Diagram

August 2007

Precision Edge is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

product line.

guaranteed

over

the

full

) without any

industrial

with Fail Safe Input and Internal Termination

1GHz Precision, LVDS ÷3, ÷5 Clock Divider

Features

• Accepts a high-speed input and provides a precision

• Fail-Safe Input

• Guaranteed AC performance over temperature and

• Ultra-low jitter design:

• Unique patented internal termination and VT pin

• Wide input voltage range VCC to GND

• 325mV LVDS output

• 46% to 54% Duty Cycle(÷ 3)

• 47% to 53% Duty Cycle(÷ 5)

• 2.5V ±5% supply voltage

• -40°C to +85°C industrial temperature range

• Available in 16-pin (3mm x 3mm) QFN package

Applications

• Fail-safe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement

÷3 and ÷5 sub-rate, LVDS output

supply voltage:

– DC-to >1.0GHz throughput

– <1500ps Propagation Delay (In-to-Q)

– <1ps

– <10ps

– <0.7ps

accepts DC- and AC-coupled inputs (CML, PECL,

LVDS)

–

– <220ps Rise/Fall times

Prevents oscillations when input is invalid

RMS

total jitter (clock)

random jitter

cycle-to-cycle jitter

MUX crosstalk induced jitter

SY89229U

hbwhelp@micrel.com

or (408) 955-1690

M9999-080707-A

Precision Edge

Related parts for SY89229UMG

SY89229UMG Summary of contents

Page 1

... Block Diagram Precision Edge is a registered trademark of Micrel, Inc. 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 1GHz Precision, LVDS ÷3, ÷5 Clock Divider ...

Page 2

... Micrel, Inc. (1) Ordering Information Part Number Package SY89229UMG QFN-16 (2) SY89229UMGTR QFN-16 Notes: 1. Contact factory for die availability. Dice are guaranteed Tape and Reel. Pin Configuration August 2007 Operating Type Range Industrial Industrial = 25°C, DC Electricals Only. A 16-Pin QFN 2 Package Marking 229U with ...

Page 3

Micrel, Inc. Pin Description Pin Number Pin Name 1, 4 IN, / VREF- / VCC 12 GND, 10, 11, 14,15 Exposed Pad 16 DIV_SEL Truth Table August ...

Page 4

Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V ) .......................... –0.5V to +4.0V CC Input Voltage (V ) .................................. –0. LVDS Output Current (I )………………….±10mA OUT Current ( Source or sink current ...

Page 5

Micrel, Inc. LVDS Outputs DC Electrical Characteristics = 100Ω across the outputs +2.5V ±5 Symbol Parameter V Output Voltage Swing OUT (Q, /Q) V Differential Output Voltage Swing DIFF_OUT |Q – /Q| V Output ...

Page 6

Micrel, Inc. AC Electrical Characteristics = 100Ω across the outputs 2.5V ±5 Symbol Parameter f Maximum Input Operating MAX Frequency tw Minimum Pulse Width t Differential Propagation Delay pd In-to-Q In-to-Q /MR(H-L)-to-Q t Reset ...

Page 7

Micrel, Inc. Functional Description Fail-Safe Input (FSI) The input includes a special failsafe circuit to sense the amplitude of the input signal and to latch the outputs when there is no input signal present, or when the amplitude of the ...

Page 8

Micrel, Inc. Timing Diagrams August 2007 Figure 1a. Propagation Delay Figure 1b. Fail Safe Feature 8 SY89229U M9999-080707-A hbwhelp@micrel.com or (408) 955-1690 ...

Page 9

Micrel, Inc. Figure 1c. Enable Output Timing Diagram Examples (Divide by 3) August 2007 9 hbwhelp@micrel.com SY89229U M9999-080707-A or (408) 955-1690 ...

Page 10

Micrel, Inc. August 2007 Figure 1d. Divider Operation Timing Diagram 10 SY89229U M9999-080707-A hbwhelp@micrel.com or (408) 955-1690 ...

Page 11

Micrel, Inc. Typical Operating Characteristics V = 2.5V, GND = 0V 200mV August 2007 ≤ 300ps 100 across the outputs SY89229U = 25°C, unless otherwise stated. ...

Page 12

Micrel, Inc. Functional Characteristics V =2.5V, GND = 0V 100mV Divide stated. August 2007 ≤ 300ps 100Ω across the outputs hbwhelp@micrel.com SY89229U = ...

Page 13

Micrel, Inc. Single-Ended and Differential Swings Figure 2a. Single-Ended Voltage Swing Input Stage August 2007 Figure 3. Simplified Differential Input Stage 13 Figure 2b. Differential Voltage Swing M9999-080707-A hbwhelp@micrel.com or (408) 955-1690 SY89229U ...

Page 14

Micrel, Inc. Input Interface Applications Figure 4a. LVPECL Interface (DC-Coupled) Figure 4d. CML Interface (AC-Coupled) August 2007 Figure 4b. LVPECL Interface (AC-Coupled) Figure 4e. LVDS Interface (DC-Coupled) 14 SY89229U Option: may connect Figure 4c. CML ...

Page 15

Micrel, Inc. LVDS Output Interface Applications LVDS specifies a small swing of 325mV typical nominal 1.2V common mode above ground. The common mode voltage has tight limits to permit large variations in the ground between and LVDS driver ...

Page 16

Micrel, Inc. Package Information Packages Notes: 1. Package meets Level 2 Moisture Sensitivity Classification. 2. All parts are dry-packed before shipment. 3. Exposed pad must be soldered to a ground for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN ...

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