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PI6C484321FBE Datasheet(PDF) 4 Page - Pericom Semiconductor Corporation |
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PI6C484321FBE Datasheet(HTML) 4 Page - Pericom Semiconductor Corporation |
4 / 9 page 4 PS8765A 08/01/05 PI6C484321 260MHz Crystal-to-3.3V Differential LVPECL Frequency Synthesizer Pin Characteristics Symbol Parameter Min. Typ. Max. Units CIN Input capacitance 4 pF RPULLUP Input Pullup resistor 51 kΩ RPULLDOWN Input Pulldown resistor 51 Parallel and Serial Modes Function Table Inputs Conditions MR nP_LOAD M N S_LOAD S_CLOCK S_DATA H X X X X X X Reset mode, forces outputs LOW. L L Data Data X X X Data on M and N input passed directly to the M divider. TEST output forced LOW L ↑ Data Data L X X Data is latched into input registers and remains loaded until next LOW transition or until a serial event occurs L H X X L ↑ Data Serial input mode. Shift register is loaded with data on S-DATA on each rising edge of S_CLOCK L H X X ↑ L Data Contents of the shift register are passed to the M divider L H X X ↓ L Data M divider and N output divider values are latched L H X X L X X Parallel or serial input do not affect shift registers L H X X H ↑ Data S_Data passed directly to M divider as it is clocked Notes: L = Low, H = High, X = Don't care, ↑ = Rising Edge, and ↓ = Falling edge Transition Programmable VCO Frequency Example Based On 25MHz input VCO Freq. M Divider 256 128 64 32 16 8 4 2 1 M8 M7 M6 M5 M4 M3 M2 M1 M0 625 25 0 0 0 0 1 1 0 0 1 650 26 0 0 0 0 1 1 0 1 0 675 27 0 0 0 0 1 1 0 1 1 775 31 0 0 0 0 1 1 1 1 1 Programmable Output Divider FunctionTable Inputs N Divider Value Output Frequency (MHz) N1 N0 Min. Max. 0 0 3 106.67 366.67 0 1 4 80 275 1 0 5 64 220 1 1 6 53.33 183.33 Notes: Fout_min = Fvco_min / N = 320MHz / N Fout_max = Fvco_max /N = 1100MHz / N |
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