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SY89531LHZ Datasheet(PDF) 11 Page - Micrel Semiconductor |
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SY89531LHZ Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 16 page 11 Precision Edge® SY89531L Micrel, Inc. M9999-010808 hbwhelp@micrel.com or (408) 955-1690 Power Supply Filtering Techniques As with any high-speed integrated circuit, power supply filtering is very important. At a minimum, V CCA, VCC_Logic, and all V CCO pins should be individually connected using a via to the power supply plane, and separate bypass capacitors should be used for each pin. To achieve optimal jitter performance, each power supply pin should use separate instances of the circuit shown in Figure 4. *For VCC_Analog,VCC_TTL, VCC1, use ferrite bead = 200mA, 0.45 Ω DC, Murata P/N BLM21A1025 *For VCC_OUT use ferrite bead = 3A, 0.025 Ω DC, Murata, P/N BLM31P005 *Component size: 0805 1 µF 22 µF 0.01 µF Ferrite Bead* “Power Supply” side “Device” side VCC Pins Figure 4. Power Supply Filtering Output Logic Characteristics See “Output Termination Recommendations” for illustrations. In cases where single-ended output is desired, the designer should terminate the unused complimentary output in the same manner as the normal output that is begin used. Unused output pairs can be left floating. Unused output banks can be switched off by tying the appropriate FSEL pins to ground. Unused output pairs that are in a bank that is disabled can be left floating, regardless of output driver type. LVPECL operation: • Typical voltage swing is 700mV PP to 800mVPP into 50 Ω. • Common mode voltage is V CC–1.3V, typical. • 100 Ω termination across the output pair is NOT recommended for LVPECL. HSTL operation (Bank B): • Typical voltage swing is 250mV PP to 450mVPP into effective 50 Ω. Thermal Considerations This part has an exposed die pad for enhanced heat dissipation. We strongly recommend soldering the exposed pad to a ground plane. Where this is not possible, we recommend maintaining at least 500lfpm air flow. For additional information on exposed-pad characteristics and implementation details, see Amkor Technology’s write- up at www.amkor.com. FSEL_A2(1) (MSB) FSEL_A1(1) FSEL_A0(1) (LSB) Output Divider 0 0 0 Output Disable Function, all outputs: Q = LOW, /Q = HIGH 0 0 1 VCO ÷ 2 0 1 0 VCO ÷ 4 0 1 1 VCO ÷ 6 1 0 0 VCO ÷ 8 1 0 1 VCO ÷ 10 1 1 0 VCO ÷ 12 1 1 1 VCO ÷ 18 POST-DIVIDE FREQUENCY SELECT TABLE (FSEL) Note 1. Same dividers apply to FSEL_B (0:2) and FSEL_C (0:2). |
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