4.25 Gbps Precision, 1:2 CML Fanout Buffer with Internal Termination and
Fail Safe Input
Features
• Precision 1:2, 400 mV CML Fanout Buffer
• Guaranteed AC Performance over Temperature
and Voltage:
- DC-to >4.25 Gbps Throughput
- <320 ps Propagation Delay (IN-to-Q)
- <15 ps Within-Device Skew
- <85 ps Rise/Fall Times
• Fail Safe Input
- Prevents Outputs From Oscillating When
Input is Invalid
• Ultra-Low Jitter Design
- 100 fs
RMS
Typical Additive Jitter
• High-Speed CML Outputs
• 2.5V ±5% or 3.3V ±10% Power Supply Operation
• Industrial Temperature Range: –40°C to +85°C
• Available In 16-lead (3 mm x 3 mm) QFN
Package
General Description
The SY58606U is a 2.5/3.3V, high-speed, fully
differential 1:2 CML fanout buffer optimized to provide
two identical output copies with less than 15 ps of skew
and 100 fs
RMS
of typical additive phase jitter. The
SY58606U can process clock signals as fast as 3 GHz
or data patterns up to 4.25 Gbps.
The differential input includes Microchip’s unique,
3-lead input termination architecture that interfaces to
LVPECL, LVDS, or CML differential signals, (AC- or
DC-coupled) as small as 100 mV (200 mV
PP
) without
any level-shifting or termination resistor networks in the
signal path. For AC-coupled input interface
applications, an integrated voltage reference (V
REF-AC
)
is provided to bias the V
T
pin. The outputs are 400 mV
CML, with extremely fast rise/fall times guaranteed to
be less than 85 ps.
The SY58606U operates from a 2.5V ±5% supply or
3.3V ±10% supply and is guaranteed over the full
industrial temperature range (–40°C to +85°C). For
applications that require LVPECL or LVDS outputs,
consider Microchip’s SY58607U and SY58608U, 1:2
fanout buffers with 800 mV and 325 mV output swings
respectively. The SY58606U is part of Microchip’s
high-speed, Precision Edge
®
product line.
Applications
•
•
•
•
Data Distribution: OC-48, OC-48+FEC, XAUI
SONET Clock and Data Distribution
Fibre Channel Clock and Data Distribution
Gigabit Ethernet Clock And Data Distribution
Markets
•
•
•
•
•
•
•
Storage
ATE
Test and Measurement
Enterprise Networking Equipment
High-End Servers
Access
Metro Area Network Equipment
Package Type
SY58606U
3 mm x 3 mm QFN-16 (M)
(Top View)
GND
GND
14
VCC
16
15
13
12
11
10
9
VCC
IN
VT
VREF-AC
/IN
1
2
3
4
5
6
7
8
Q0
/Q0
Q1
/Q1
GND
United States Patent No. RE44,134
2019 Microchip Technology Inc.
GND
DS20006199A-page 1
VCC
VCC
SY58606U
Functional Block Diagram
Q0
IN
50Ω
VT
50Ω
/IN
VREF-AC
/Q0
Q1
/Q1
DS20006199A-page 2
2019 Microchip Technology Inc.
SY58606U
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
CC
) ................................................................................................................................ –0.5V to +4.0V
Input Voltage (V
IN
) ....................................................................................................................................... –0.5V to V
CC
CML Output Voltage (V
OUT
) ..................................................................................................... V
CC
– 1.0V to V
CC
+ 0.5V
Current (I
T
)
Source or Sink on VT Pin.........................................................................................................................±100 mA
Input Current
Source or Sink Current on, IN, /IN..............................................................................................................±50 mA
Current (I
REF
)
Source or Sink Current on VREF-AC (Note
1)
......................................................................................... ±1.5 mA
Maximum Operating Junction Temperature ..........................................................................................................+125°C
Lead Temperature (Soldering, 20 sec.).................................................................................................................+260°C
Storage Temperature (T
S
) ......................................................................................................................–65°C to +150°C
Operating Ratings ††
Supply Voltage (V
CC
) .......................................................................................................................... +2.375V to +3.60V
Ambient Temperature (T
A
) .......................................................................................................................–40°C to +85°C
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