SY87701VHC Micrel Inc, SY87701VHC Datasheet - Page 15

• Manufacturer Part Number: SY87701VHC
• Description: IC CLOCK/DATA RECOVERY 32-TQFP
• Manufacturer: Micrel Inc
• Type: Clock and Data Recovery (CDR)r

Specifications of SY87701VHC

• Input: PECL, TTL
• Output: PECL, TTL
• Frequency - Max: 1.25GHz
• Voltage - Supply: 3.15 V ~ 3.45 V, 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP Exposed Pad, 32-eTQFP, 32-HTQFP, 32-VQFP
• Frequency-max: 1.25GHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Micrel, Inc.
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
5. Maintain compact filter networks as close to filter pins as possible. Provide ground plane relief under filter path to
6. Maintain low jitter on the REFCLK input. Isolate the XTAL oscillator from power supply noise by adequately
7. Higher speed operation may require use of fundamental-tone (third-overtone typically have more jitter) crystal based
8. All unused outputs must be terminated. To conserve power, unused PECL outputs can be terminated with a 1k
M9999-073008
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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
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
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
traces.
reduce stray capacitance. Be careful of crosstalk coupling into the filter network.
decoupling. Keep XTAL oscillator close to device, and minimize capacitive coupling from adjacent signals.
oscillator for optimum performance. Evaluate and compare candidates by measuring TXCLK jitter.
resistor to V
EE
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
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APPENDIX A
15
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SY87701V