SY100EP195V 데이터 시트보기 (PDF) - Micrel

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SY100EP195V

3.3V/5V 2.5GHz PROGRAMMABLE DELAY

Micrel 

Micrel, Inc.

TERMINATING PECL

+3.3V

+3.3V

R1

ZO = 50Ω 130Ω

ZO = 50Ω

R2

82Ω

R1

130Ω +3.3V

R2

82Ω Vt = VCC –2V

ECL Pro®

SY100EP195V

Figure 6a. Parallel Termination—Thevenin Equivalent

Note:

1. For +5.0V systems: R1 = 82Ω, R2 = 130Ω.

+3.3V

Z = 50Ω

Z = 50Ω

+3.3V

“Source”

50Ω

50Ω

50Ω

“Destination”

Rb

C1 (optional)

0.01µF

Figure 6b. 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 = 46Ω to 50Ω. For +5V systems, Rb = 110Ω.

+3.3V

+3.3V

+3.3V

Q

R1

130Ω

ZO = 50Ω

/Q

Vt = VCC –2V

R2

82Ω

R1

130Ω

+3.3V

50Ω

VBB

0.01µF

R2

82Ω

+3.3V

Figure 6c. Terminating Unused I/O

Notes:

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

2. Micrel's differential I/O logic devices include a VBB reference pin .

3. Connect unused input through 50Ω to VBB. Bypass with a 0.01µF capacitor to VCC, not GND, as PECL is referenced to VCC.

M9999-120505

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

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