SY89837UMGTR datasheet(2/14 Pages) MICREL

Part #	SY89837UMGTR

Description	PRECISION 1:8 LVPECL FANOUT BUFFER WITH 2:1 RUNT PULSE ELIMINATOR INPUT MUX

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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2

Precision Edge®

SY89837U

Micrel, Inc.

M9999-022007

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

IN1

50

Ω

50

Ω

/IN1

VT1

VREF-AC1

Q2

/Q2

Q1

/Q1

Q0

/Q0

VREF-AC0

Q5

/Q5

Q4

/Q4

Q3

/Q3

/Q7

/Q6

Q7

Q6

MUX

IN0

50

Ω

50

Ω

/IN0

VT0

0

1S

SEL

Runt Pulse

Elimination Logic

2:1 MUX

1:8 Fanout

Primary Clock

From System

Secondary Clock

From Local Oscillator

TYPICAL APPLICATIONS CIRCUIT

Primary

Clock

Secondary

Clock

SEL

OUTPUT

Select Secondary

Select Primary

Runt pulse eliminated

from output

Switchover

occurs

Figure 1. Simplified Example Illustrating Runt Pulse Eliminator (RPE)

Circuit When Primary Clock Fails

Inputs

Outputs

IN0

/IN0

IN1

/IN1

SEL

Q

/Q

01

X

00

1

10

X

01

0

X

011

0

1

X

101

1

0

TRUTH TABLE

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SY89837UMGTR Datasheet(PDF) 2 Page - Micrel Semiconductor

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