SY89834U datasheet(9/10 Pages) MICREL

Part #	SY89834U

Description	2.5V/3.3V TWO INPUT, 1GHz LVTTL/CMOSTO-LVPECL 1:4 FANOUT BUFFER/TRANSLATOR WITH 2:1 INPUT MUX

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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9 / 10 page

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

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

TERMINATION RECOMMENDATIONS

Ω

ZO = 50Ω

+3.3V

Vt = VCC —2V

130

Ω

130

Ω

+3.3V

Figure 4a. Parallel Termination–Thevenin Equivalent

Note:

1. For +2.5V systems: R1 = 250

Ω, R2 = 62.5Ω

For +3.3V systems: R1 = 130

Ω, R2 = 82Ω

Z = 50

Ω

Z = 50

Ω

+3.3V

“source”“destination”

VCC

0.01µF

(optional)

Figure 4b. Three-Resistor “Y–Termination”

Notes:

1. Power-saving alternative to Thevenin termination.

2. Place termination resistors as close to destination inputs as possible.

3. Rb resistor sets the DC bias voltage, equal to Vt. For +3.3V systems Rb = 50Ω. For +2.5V systems Rb = 19Ω.

+3.3V

ZO = 50Ω

Ω

+3.3V

130

Ω

130

Ω

Vt = VCC —2V

Ω

1.6k

Ω

Vt = VCC —1.3V

Figure 4c. Terminating Unused LVPECL I/O

Notes:

1. Unused output (/Q) must be terminated to balance the output.

2. For +2.5V systems: R1 = 250

Ω, R2 = 62.5Ω, R3 = 1.25kΩ, R4 = 1.2kΩ.

2. Unused output pairs (Q and /Q) may be left floating.

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