Microchip SY58012U Handleiding

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 2020 Microchip Technology Inc. DS20006319B-page 1

SY58012U

Features

• Precision 1:2, 800 mV LVPECL Fanout Buffer

• Guaranteed AC Performance over Temperature

and Voltage:

- >5 GHz fMAX (Clock)

- <110 ps Rise/Fall Time

- <260 ps Propagation Delay

- <15 ps Max Skew

• Low Jitter Design:

- 60 fsRMS Phase Jitter

• Accepts an Input Signal as Low as 100 mV

• Unique Input Termination and VT Pin Accepts DC-

and AC-Coupled Differential Inputs (LVPECL,

LVDS and CML)

• 800 mV (100k) LVPECL Output Swing

• 2.5V ±5% or 3.3V ±10% Power Supply Operation

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

• Available in a 16-Lead 3 mm x 3 mm QFN

Package

Applications

• All SONET and GigE Clock Distribution

• Fibre Channel Clock and Data Distribution

• Backplane Distribution

• High-End, Low Skew, Multiprocessor

Synchronous Clock Distribution

General Description

The SY58012U is a 2.5V/3.3V precision, high-speed,

fully differential 1:2 LVPECL fanout buffer. Optimized to

provide two identical output copies with less than 15 ps

of skew, the SY58012U can process clock signals as

fast as 5 GHz or 5 Gbps data.

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

input termination architecture that interfaces to

LVPECL, LVDS or CML differential signals,

(AC-coupled or DC-coupled) as small as 100 mV

without any level-shifting or termination resistor

networks in the signal path. For AC-coupled input

interface applications, an on-board output reference

voltage (VREF-AC) is provided to bias the VT pin. The

outputs are 100k LVPECL compatible, with extremely

fast rise/fall times guaranteed to be less than 110 ps.

The SY58012U 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 faster rise/fall times, or greater

bandwidth, consider the SY58013U 1:2 fanout buffer

with 400 mV output swing, or the SY58011U 1:2 CML

(400 mV) fanout buffer. The SY58012U is part of

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

Package Type

SY58012U

3 mm x 3 mm QFN-16 (M)

(Top View)

13141516

8765

VREF-AC

/IN

/Q0

/Q1

VCC

GND

VCC

GND

VCC

5 GHz 1:2 LVPECL Fanout Buffer/Translator

with Internal Input Termination

SY58012U

DS20006319B-page 2  2020 Microchip Technology Inc.

Functional Block Diagram

/IN Q1

/Q1

/Q0

50Ω

-AC

VREF

 2020 Microchip Technology Inc. DS20006319B-page 3

SY58012U

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

Power Supply Voltage (VCC) ..................................................................................................................... –0.5V to +4.0V

Input Voltage (VIN) ....................................................................................................................................... –0.5V to V

LVPECL Output Current (IOUT)

Continuous .........................................................................................................................................................50 mA

Surge................................................................................................................................................................

100 mA

Termination Current (IVT)

Source or Sink on VT Pin...............................................................................................................................±100 mA

Input Current

Source or Sink Current on IN, /IN ....................................................................................................................±50 mA

Reference Current (VREF-AC)

VREF-AC Current ..............................................................................................................................................±1.5 mA

Operating Ratings ††

Supply Voltage Range (VCC

)............................................................................................................... +2.375V to +3.63V