1

SY89547L

Micrel, Inc.

M9999-091809

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

s Selects among four differential inputs

s Provides two copies of the selected input

s Guaranteed AC performance over temp and voltage:

• DC-to > 3.2Gbps data rate throughput

s Unique input isolation design minimizes crosstalk

s Ultra-low jitter design:

s Internal input termination

s Unique input termination and V

coupled and AC-coupled inputs (LVDS, LVPECL,

CML)

s 350mV LVDS output swing

s Power supply 3.3V

s –40

FEATURES

3.3V, 3.2Gbps DIFFERENTIAL 4:1 LVDS

MULTIPLEXER with 1:2 FANOUT and

INTERNAL TERMINATION

SY89547L

APPLICATIONS

s SONET/SDH multi-channel select applications

s Fibre Channel applications

s GigE applications

Rev.: D

Amendment: /0

Issue Date:

September 2009

The SY89547L is a precision, high-speed 4:1 differential

multiplexer that provides two copies of the selected input.

The high speed LVDS (350mV) compatible outputs with a

guaranteed throughput of up to 3.2Gbps over temperature

and voltage.

The SY89547L differential inputs include Micrel’s unique,

3-pin internal termination design that allows access to the

the device to easily interface to different logic standards,

both AC- and DC-coupled without external resistor-bias and

termination networks. The result is a clean, stub-free, low

jitter interface solution.

The SY89547L operates from a single 3.3V supply, and

is guaranteed over the full industrial temperature range

(–40

°C to +85°C). For applications that require a 2.5V supply,

consider the SY89546U. For applications that only require

one differential output, consider the SY89544U or SY89545L.

family. All support documentation can be found on Micrel’s

web site at: www.micrel.com.

TYPICAL PERFORMANCE

FUNCTIONAL BLOCK DIAGRAM

IN0

/IN0

50

Ω

50

Ω

IN1

/IN1

50

Ω

50

Ω

Q0

/Q0

0

1

MUX

4:1 MUX

1:2 Fanout

LVDS

IN2

/IN2

50

Ω

50

Ω

2

IN3

/IN3

50

Ω

50

Ω

3 S0

S1

SEL0 (CMOS/TTL)

SEL1 (CMOS/TTL)

Q1

/Q1

Precision Edge is a registered trademark of Micrel, Inc.

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

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50

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1000 2000 3000 4000 5000 6000

FREQUENCY (MHz)

Output Amplitude

vs. Frequency