Microchip SY58028U Bedienungsanleitung

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Precision Edge

®

SY58028U

Micrel, Inc.

M9999-082707

[email protected] or (408) 955-1690

DESCRIPTION

■Selects 1 of 4 differential inputs

■Provides two copies of the selected input

■Guaranteed AC performance over temperature and

voltage:

•DC-to- >10.7Gbps data rate throughput

•<350ps IN-to-Out t

pd

•<60ps t

r

/t

f

times

■Ultra low-jitter design:

•<10ps

PP

total jitter (clock)

•<1ps

RMS

random jitter

•<10ps

PP

deterministic jitter

•< 0.7ps

RMS

crosstalk-induced jitter

■Unique patended input design minimizes crosstalk

■Accepts an input signal as low as 100mV

■Unique patended input termination and V

T

pin

accepts DC- and AC-coupled inputs (CML, LVPECL,

LVDS)

■Internal 50Ω output source termination

■400mV CML output swing (R

L

= 50Ω)

■Power supply 2.5V ±5% or 3.3V ±10%

■–40°C to +85°C temperature range

■Available in 32-pin (5mm

××

××

× 5mm) MLF

®

package

FEATURES

ULTRA PRECISION DIFFERENTIAL

CML 4:1 MUX WITH 1:2 FANOUT

AND INTERNAL I/O TERMINATION

Precision Edge

®

SY58028U

APPLICATIONS

■Redundant clock and/or data distribution

■All SONET/SDH clock/data distribution

■Loopback

■All Fibre Channel distribution

■All Gigabit Ethernet clock and/or data distribution

Rev.: DAmendment: /0

Issue Date:August 2007

The SY58028U is a 2.5V/3.3V precision, high-speed, 4:1

differential CML multiplexer capable of handling clocks up

to 7GHz and data streams up to 10.7Gbps. In addition, a

1:2 fanout buffer provides two copies of the selected inputs.

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

termination architecture that allows customers to interface to

any differential signal (AC- or DC-coupled) as small as 100mV

without any level shifting or termination resistor networks in

the signal path. The result is a clean, stub-free, low-jitter

interface solution. The outputs are 50Ωsource terminated

CML, with extremely fast rise/fall times guaranteed to be less

than 60ps.

The SY58028U operates from a 2.5V±5% supply or a

3.3V±10% supply and is guaranteed over the full industrial

temperature range of –40°C to +85°C. For applications that

require LVPECL outputs, consider the SY58029U or

SY58030U Multiplexers. The SY58028U is part of Micrel’s

high-speed, Precision Edge

®

product line.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

TYPICAL PERFORMANCE

Precision Edge is a registered trademark of Micrel, Inc.

Micro

LeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

Precision Edge

®

FUNCTIONAL BLOCK DIAGRAM

IN0

/IN0

V

T0

50Ω

50Ω

IN1

/IN1

V

T1

50Ω

50Ω

Q0

/Q0

0

1

MUX

4:1

MUX

1:2

Fanout

V

REF-AC0

IN2

/IN2

V

T2

50Ω

50Ω

V

REF-AC2

V

REF-AC1

2

IN3

/IN3

V

T3

50Ω

50Ω

V

REF-AC3

3

SEL0 (CMOS/TTL)

SEL1 (CMOS/TTL)

Q1

/Q1









TIME(100ps/div.)

OutputSwing

(100mV/div.)

Produktspezifikationen