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SM8721AB Datasheet(PDF) 2 Page - Nippon Precision Circuits Inc |
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SM8721AB Datasheet(HTML) 2 Page - Nippon Precision Circuits Inc |
2 / 8 page SM8721AB SEIKO NPC CORPORATION —2 BLOCK DIAGRAM PIN DESCRIPTION Number Name I/O Description 1 VDD3 – Analog supply voltage 3 2 VDD3 – Analog supply voltage 3 3 VSS3 – Analog supply ground 3 4 XTI I Crystal oscillator element connection pin (14.318182/28.636363MHz) 5 XTO O Crystal oscillator element connection pin 6 TEST1 I Test pin 1. Built-in pull-down resistance (leave open circuit or connect to VSS) 7 XTAL_SEL I Crystal oscillator element selection pin. Built-in pull-up resistance (HIGH = 28.636MHz, LOW = 14.318MHz) 8 FS3 I CLK1, CLK2 output select 3. Built-in pull-up resistance 9 FS2 I CLK1, CLK2 output select 2. Built-in pull-up resistance 10 FS1 I REF_CLK output select 1. Built-in pull-up resistance 11 CLK1 O Clock output (71/90/96/114MHz switchable output) 12 CLK2ON I CLK2 output enable. Built-in pull-up resistance (HIGH = enable, LOW = disable) 13 VSS1 – Digital supply ground 1 14 VDD1 – Digital supply voltage 1 15 VDD1 – Digital supply voltage 1 16 CLK2 O Clock output (48/96MHz switchable output) 17 VSS2 – Digital supply ground 2 18 VDD2 – Digital supply voltage 2 19 REF_CLK O Clock output (14.318/17.734MHz switchable output) 20 TEST2 I Test pin 2. Built-in pull-down resistance (leave open circuit or connect to VSS) CLK2ON Reference Divider 1 Phase Detector 1 Charge Pump 1 LPF 1 VCO 1 Control Logic CLK1 Loop Divider 1 (PLL1) Reference Divider 2 Phase Detector 2 Charge Pump 2 LPF 2 VCO 2 Loop Divider 2 (PLL2) Reference Divider 3 Phase Detector 3 Charge Pump 3 LPF 3 VCO 3 Loop Divider 3 (PLL3) XTAL_SEL CLK2 REF_CLK FS2 FS1 Oscillator XTO XTI FS3 TEST1 TEST2 |
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