SY87701LZG 查看數據表（PDF） - Micrel

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SY87701LZG

3.3V 32-1250Mbps AnyRate® CLOCK AND DATA RECOVERY

Micrel 

Micrel, Inc.

SY87701L

APPENDIX A

Layout and General Suggestions

1. Establish controlled impedance stripline, microstrip, or co-planar construction techniques.

2. Signal paths should have, approximately, the same width as the device pads.

3. All differential paths are critical timing paths, where skew should be matched to within ±10ps.

4. Signal trace impedance should not vary more than ±5%. If in doubt, perform TDR analysis of all high-speed signal

traces.

5. Maintain compact filter networks as close to filter pins as possible. Provide ground plane relief under filter path to

reduce stray capacitance. Be careful of crosstalk coupling into the filter network.

6. Maintain low jitter on the REFCLK input. Isolate the XTAL oscillator from power supply noise by adequately

decoupling. Keep XTAL oscillator close to device, and minimize capacitive coupling from adjacent signals.

7. Higher speed operation may require use of fundamental-tone (third-overtone typically have more jitter) crystal based

oscillator for optimum performance. Evaluate and compare candidates by measuring TXCLK jitter.

8. All unused outputs must be terminated. To conserve power, unused PECL outputs can be terminated with a 1kΩ

resistor to VEE.

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TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.

© 2006 Micrel, Incorporated.

M9999-111506

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

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