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LMX2301TMX データシート(PDF) 6 Page - National Semiconductor (TI) |
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LMX2301TMX データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 14 page Functional Description The simplified block diagram below shows the 19-bit data register the 14-bit R Counter and the R15 Latch and the 11-bit N Counter (intermediate latches are not shown) The data stream is clocked (on the rising edge) into the DATA input MSB first If the Control Bit (last bit input) is HIGH the DATA is transferred into the R Counter (programmable reference divider) and the S Latch (power up counter reset) If the Control Bit (LSB) is LOW the DATA is transferred into the N Counter (programmable divider) TLW12458 – 1 PROGRAMMABLE REFERENCE DIVIDER (R COUNTER) AND COUNTER RESET (R15 LATCH) If the Control Bit (last bit shifted into the Data Register) is HIGH data is transferred from the 19-bit shift register into a 14-bit latch (which sets the 14-bit R Counter) and the 1-bit R15 Latch which can be used to force an immediate load of the R and N counters during a cold power up condition Serial data format is shown below TLW12458 – 14 14-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER) Divide 14 R 13 R 12 R 11 R 10 RR 9 R 8 R 7 R 6 R 5 R 4 R 3 R 2 R 1 Ratio R 3 0 0 0 0 0 000000011 4 0 0 0 0 0 000000100 # # # # # # # ######## 16383 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Notes Divide ratios less than 3 are prohibited Divide ratio 3 to 16383 R1 to R14 These bits select the divide ratio of the programmable reference divider C Control bit (set to HIGH level to load R counter and R15 Latch) Data is shifted in MSB first 1-BIT COUNTER RESET (R15 LATCH) Counter R Reset 15 Remove 0 Forced Load Force 1 Load State The 1-bit counter reset latch controls whether the R and N counters are im- mediately forced to load conditions upon power up If R 15 e HIGH the N and R latch states are immediately read into the respective counters SUGGESTED PROGRAMMING SEQUENCE AFTER COLD POWER-UP 1 Program N counter with desired divide ratio 2 Program R counter with R15e1 and desired divide ratio (N and R counters hold at load state) 3 Program R counter with R15e0 and desired divide ratio (N and R counters start counting) http www nationalcom 6 |
同様の部品番号 - LMX2301TMX |
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同様の説明 - LMX2301TMX |
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