SY58021U datasheet(2/9 Pages) MICREL

Part #	SY58021U

Description	4GHz, 1:4 LVPECL FANOUT BUFFER/ TRANSLATOR WITH INTERNAL TERMINATION

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Precision Edge®

SY58021U

Micrel, Inc.

M9999-062405

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

PACKAGE/ORDERING INFORMATION

Pin Number

Pin Name

Pin Function

1, 4

IN, /IN

Differential Input: This input pair receives the signal to be buffered. Each pin of this pair

internally terminates with 50

Ω to the VT pin. Note that this input will default to an

indeterminate state if left open. See “Input Interface Applications” section.

2

VT

Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a

center-tap for each input (IN, /IN) to the termination network for maximum interface

flexibility. See “Input Interface Applications” section.

3

VREF-AC

Reference Output Voltage: This output biases to VCC –1.2V. It is used when AC-coupling

to differential inputs. Connect V

REF-AC directly to the VT pin. Bypass with 0.01µF low ESR

capacitor to VCC. See “Input Interface Applications” section.

8, 13

VCC

Positive Power Supply: Bypass with 0.1

µF//0.01µF low ESR capacitors as close to the

VCC pins as possible.

5, 16

GND,

Ground. Exposed pad must be connected to a ground plane that is the same potential as

Exposed Pad

the ground pin.

14, 15

/Q0, Q0,

LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The

11, 12

/Q1, Q1,

output swing is typically 800mV Proper termination is 50

Ω to V

CC–2V at the receiving end.

9, 10

/Q2, Q2,

Unused output pairs may be left floating with no impact on jitter or skew.

6, 7

/Q3, Q3

See “LVPECL Output Termination” section.

PIN DESCRIPTION

13

14

15

16

12

11

10

9

1

2

3

4

8

7

6

5

IN

VT

VREF-AC

/IN

Q1

/Q1

Q2

/Q2

16-Pin MLF™ (MLF-16)

Ordering Information(1)

Package

Operating

Package

Lead

Part Number

Type

Range

Marking

Finish

SY58021UMI

MLF-16

Industrial

021U

Sn-Pb

SY58021UMITR(2)

MLF-16

Industrial

021U

Sn-Pb

SY58021UMG

MLF-16

Industrial

021U with

Pb-Free

Pb-Free bar-line indicator

NiPdAu

SY58021UMGTR(2)

MLF-16

Industrial

021U with

Pb-Free

Pb-Free bar-line indicator

NiPdAu

Notes:

1. Contact factory for die availability. Dice are guaranteed at T

A = 25°C, DC electricals only.

2. Tape and Reel.

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