SY89843UMG TR Micrel Inc, SY89843UMG TR Datasheet

IC,ANALOG MUX,SINGLE,2-CHANNEL,LLCC,24PIN,PLASTIC

SY89843UMG TR

Manufacturer Part Number

SY89843UMG TR

Description

IC,ANALOG MUX,SINGLE,2-CHANNEL,LLCC,24PIN,PLASTIC

Manufacturer

Micrel Inc

Type

Multiplexerr

Series

SY89r

Datasheet

1.SY89843UMG.pdf (17 pages)

Specifications of SY89843UMG TR

Circuit

1 x 2:1

Independent Circuits

Voltage Supply Source

Single Supply

Voltage - Supply

3 V ~ 3.6 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

24-MLF®, QFN

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

Lead free / RoHS Compliant

Current - Output High, Low

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

SY89843UMGTR
SY89843UMGTR

Current page: 1 of 17
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General Description

The SY89843U is a low jitter PECL, 2:1 differential input

multiplexer (MUX) optimized for redundant source

switchover applications. Unlike standard multiplexers,

the SY89843U unique 2:1 Runt Pulse Eliminator (RPE)

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 DC voltage (voltage

between the pins of the differential input drops below

100mV).

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

input termination architecture that allows customers to

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

as small as 100mV (200mV

or 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 SY89843U 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 SY89843U is

part of Micrel’s high-speed, Precision Edge

line. All support documentation can be found on Micrel’s

web site at: www.micrel.com.

May 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

) without any level shifting

product

MUX with 1:2 Fanout and Internal Termination

Precision LVPECL Runt Pulse Eliminator 2:1

Features

•

Applications

•

Markets

•

Selects between two sources, and provides a

glitch-free, stable LVPECL output

Guaranteed AC performance over temperature

and supply voltage:

Unique patent-pending input isolation design

minimizes crosstalk

Fail-Safe Input prevents oscillations

Ultra-low jitter design:

– <1ps

– <10ps

– <0.7ps

Unique patent-pending input termination and VT

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

PECL, LVDS)

800mV 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) QFN package

Redundant clock switchover

Failsafe clock protection

LAN/WAN

Enterprise servers

ATE

Test and measurement

– Wide operating frequency: 1kHz to >1.5GHz

– < 880ps In-to-Out t

– < 190ps t

RMS

random jitter

cycle-to-cycle jitter

total jitter (clock)

MUX crosstalk induced jitter

SY89843U

hbwhelp@micrel.com

Precision Edge

or (408) 955-1690

M9999-052207-B

Related parts for SY89843UMG TR

SY89843UMG TR Summary of contents

Page 1

... All support documentation can be found on Micrel’s web site at: www.micrel.com. 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 May 2007 SY89843U ...

Page 2

Micrel, Inc. Typical Application May 2007 Simplified Example Illustrating RPE (Runt Pulse Elimination) Circuit when Primary Clock Fails 2 hbwhelp@micrel.com SY89843U M9999-052207-B or (408) 955-1690 ...

Page 3

Micrel, Inc. (1) Ordering Information Part Number Package Type SY89843UMG (2) SY89843UMGTR Notes: 1. Contact factory for die availability. Dice are guaranteed Tape and Reel. Pin Configuration May 2007 Operating Range QFN-24 Industrial QFN-24 Industrial = 25°C, ...

Page 4

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

Page 5

Micrel, Inc. 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 Termination Current Source/Sink Current on ...

Page 6

Micrel, Inc. 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 ...

Page 7

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

Page 8

Micrel, Inc. Functional Description RPE MUX and Fail-Safe Input The SY89843U 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: Runt-Pulse Eliminator (RPE) ...

Page 9

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), then the switchover will occur in ...

Page 10

Micrel, Inc. Case #3 Input Clock Failure: Switching from a selected clock stuck Low to a valid clock (RPE enabled). If CLK1 fails LOW before the RPE MUX selects CLK2 (using the SEL pin), the switchover will occur in two ...

Page 11

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 CLK1 fails to an undetermined state (e.g., amplitude falls below the 100mV (V single-ended ...

Page 12

Micrel, Inc. Typical Operating Characteristics ≥ 400mV V = 3.3V, GND = 0V May 2007 ≤ 300ps 50Ω –2V SY89843U = 25°C, unless ...

Page 13

Micrel, Inc. Functional Characteristics ≥ 400mV V = 3.3V, GND = 0V May 2007 ≤ 300ps 50Ω –2V SY89843U = 25°C, unless otherwise ...

Page 14

Micrel, Inc. Singled-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Input and Output Stages Figure 2a. Simplified Differential Input Stage May 2007 Figure 1b. Differential Voltage Swing Figure 2b. Simplified LVPECL Output Stage 14 hbwhelp@micrel.com SY89843U M9999-052207-B or (408) ...

Page 15

Micrel, Inc. 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 15 SY89843U Option: may connect Figure 3c. CML Interface ...

Page 16

Micrel, Inc. 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 impedance transmission ...

Page 17

Micrel, Inc. Product 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. ...

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