SY89531L_08 datasheet(15/16 Pages) MICREL

Part #	SY89531L

Description	3.3V, PRECISION, 33MHz to 500MHz PROGRAMMABLE LVPECL AND

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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15

Precision Edge®

SY89531L

Micrel, Inc.

M9999-010808

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

R2

82

Ω

R2

82

Ω

ZO = 50Ω

+3.3V

Vt = VCC –2V

R1

130

Ω

R1

130

Ω

+3.3V

“Source”“Destination”

Figure 6. PECL Parallel Termination Thevenin Equivalent (Note 1)

ZO = 50Ω

50

Ω

50

Ω

50

Ω

+3.3V

“Source”“Destination”

Rb

C1 (optional)

0.01

µF

Figure 7. LVPECL Three-Resistor “Y-Termination” (Notes 1, 2, 3)

ZO = 50Ω

+3.3V

Source

Destination

50

Ω

50

Ω

Figure 8. HSTL Differential Termination (Note 1)

Note 1.

Place termination resistors as close to destination inputs as possible.

Note 2.

PECL Y-termination is a power-saving alternative to Thevenin termination.

Note 3.

R

b resistor sets the DC bias voltage, equal to Vt. For +3.3V systems Rb = 46Ω to 50Ω.

OUTPUT TERMINATION RECOMMENDATIONS

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SY89531L Datasheet(PDF) 15 Page - Micrel Semiconductor

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