Microchip SY89847U Bedienungsanleitung


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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
-<1000ps Propagation Delay (IN-to-Q)
-<210ps Rise/Fall Times
•Ultra-Low Jitter Design:
-<1ps
RMS
Random Jitter
-<1ps
RMS
Cycle-to-Cycle Jitter
-<10ps
PP
Total Jitter (Clock)
-<0.7ps
RMS
MUX Crosstalk Induced Jitter
•Unique, Patented MUX Input Isolation Design
Minimizes Adjacent Channel Crosstalk
•Unique, Patented Internal Termination and V
T
Pin
Accepts DC- and AC-Coupled Inputs (CML,
PECL, LVDS)
•Wide Input Voltage Range V
CC
to GND
•2.5V ±5% Supply Voltage
•–40°C to +85°C Industrial Temperature Range
•Available in 32-Pin (5mm x 5mm) 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 100mV).
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
100mV (200mV
PP
) 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
5mm 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
9101112131415
16
24
23
22
21
20
19
18
17
32313029282726
25
Q1
/Q1
VCC
Q2
/Q2
VCC
Q3
/Q3
VCC
VCC
GND
GND
VREF-AC0
Q0
/Q0
VCC
1.5GHz Precision LVDS 1:5 Fanout with 2:1 MUX
and Fail Safe Input with Internal Termination

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Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89847U

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