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I2779AF-08TT Datasheet(PDF) 2 Page - Alliance Semiconductor Corporation |
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I2779AF-08TT Datasheet(HTML) 2 Page - Alliance Semiconductor Corporation |
2 / 8 page June 2005 P2779A rev 0.1 Low-Cost Notebook EMI Reduction IC 2 of 8 Notice: The information in this document is subject to change without notice. Pin Configuration Pin Description Pin# Pin Name Type Description 1 XIN / CLKIN I Connect to crystal or clock input. 2 XOUT O Crystal output. 3 PD I Power-down control pin. Pull low to enable power-down mode. This pin has an internal pull-up resistor. 1 4 LF I External loop filter for the PLL. By changing the value of the CRC circuit, the percentage spread can be adjusted accordingly. (See Loop Filter Selection Table for detail values.) 5 VSS P Ground connection. Connect to system ground. 6 ModOUT O Spread spectrum clock output. 7 REF O Provides a reference clock output of the input frequency. 8 VDD P Connect to +3.3 V. Note: 1. Connect to VDD if not used. Loop Filter Selection Table VDD 3.3 V BW = ± 0.50% BW = ± 0.75% BW = ± 1.00% BW = ± 1.25% Input (MHz) FS1 FS0 C1 (pF) C2 (pF) R1 (Ω) C1 (pF) C2 (pF) R1 (Ω) C1 (pF) C2 (pF) R1 (Ω) C1 (pF) C2 (pF) R1 (Ω) 20 1 0 270 100,000 330 270 100,000 560 270 100,000 750 560 100,000 910 21-22 1 0 270 100,000 390 270 100,000 620 270 100,000 866(1%) 560 100,000 1,100 23-24 1 0 270 100,000 510 270 100,000 750 270 10,000 1,000 680 6,800 1,200 25-26 1 0 270 100,000 560 270 100,000 820 270 12,000 1,200 470 4,700 1,200 27-28 1 0 270 100,000 620 270 100,000 1,000 270 6,800 1,200 330 3,300 1,200 29-30 1 0 270 100,000 750 270 100,000 1,100 270 3,900 1,200 330 3,300 1,500 31-32 1 0 270 100,000 820 270 100,000 1,200 270 12,000 2,200 680 6,800 2,200 33-34 1 0 270 100,000 910 270 100,000 1,300 270 10,000 2,200 390 3,900 2,200 35-36 1 0 270 100,000 1,000 270 100,000 1,500 270 5,600 2,200 270 2,700 2,200 37-38 1 0 270 100,000 1,200 270 100,000 1,600 270 3,300 2,200 270 2,700 2,700 Please contact factory for loop filter values if desired spread settings are not listed. C2 C1 R1 Pin 4 LF REF VSS 1 2 3 4 5 6 7 8 P2779A XIN/ CLKIN XOUT PD LF VDD ModOUT |
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