Microchip SY89847U Handleiding

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 2018 Microchip Technology Inc.DS20006101A-page 1

SY89847U

Features

•Selects Between Two Sources and Provides 5

Precision LVDS Copies

•Fail Safe Input Prevents Outputs from Oscillating

when Input is Invalid

•Guaranteed AC Performance over Temperature

and Supply Voltage:

-DC-to >1.5GHz Throughput

-<1000 ps Propagation Delay (IN-to-Q)

-<210 ps Rise/Fall Times

•Ultra-Low Jitter Design:

-<1 psRMS Random Jitter

-<1 psRMS Cycle-to-Cycle Jitter

-<10 psPPTotal Jitter (Clock)

-<0.7 psRMS MUX Crosstalk Induced Jitter

•Unique, Patented MUX Input Isolation Design

Minimizes Adjacent Channel Crosstalk

•Unique, Patented Internal Termination and VT Pin

Accepts DC- and AC-Coupled Inputs (CML,

PECL, LVDS)

•Wide Input Voltage Range VCC to GND

•2.5V ±5% Supply Voltage

•–40°C to +85°C Industrial Temperature Range

•Available in 32-Pin (5 mm x 5 mm) QFN Package

Applications

•Fail Safe Clock Protection

•Ultra-Low Jitter LVDS Clock Distribution

•Rack-Based Telecom/Datacom

Markets

• LAN/WAN

•Enterprise Servers

• ATE

•Test and Measurement

General Description

The SY89847U is a 2.5V, 1:5 LVDS fanout buffer with a

2:1 differential input multiplexer (MUX). A unique fail

safe input (FSI) protection prevents metastable output

conditions when the selected input clock fails to a DC

voltage (voltage between the pins of the differential

input drops significantly below 100 mV).

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

internal termination architecture that can interface to

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

100 mV (200 mVPP) without any level shifting or

termination resistor networks in the signal path. The

outputs are LVDS compatible with very fast rise/fall

times guaranteed to be less than 210ps.

The SY89847U operates from a 2.5V ±5% supply and

is guaranteed over the full industrial temperature range

of –40°C to +85°C. The SY89847U is part of

Microchip’s high-speed, Precision Edge®product line.

Package Type

SY89847U

5 mm x 5mm QFN-32 (M)

(Top View)

VT0

IN0

/IN0

OE

SEL

IN1

/IN1

VT1

VCC

VCC

GND

GND

VREF-AC1

/Q4

Q4

VCC

1

2

3

4

5

6

7

8

9101112 13 141516

24

23

22

21

20

19

18

17

32 31 30 2928 272625

Q1

/Q1

VCC

Q2

/Q2

VCC

Q3

/Q3

VCC

VCC

GND

GND

VREF-AC0

Q0

/Q0

VCC

1.5 GHz Precision LVDS 1:5 Fanout with 2:1 MUX

and Fail Safe Input with Internal Termination

Product specificaties