Crystal Clock Oscillator n Measured Load Conditions Measuring point VDD Measuring point RL OSC OUT 1TTL = 5LSTTL OSC OUT CL CL Figure 1 Load corresponding to TTL output Figure 2 Load corresponding to C-MOS output TTL 1 CL 15 pF 2 15 pF 2 kΩ 5 15 pF 800 Ω 10 15 pF 400 Ω RL 4 kΩ Note: CL includes the capacitance of the measurement system. n Circuit Diagrams Examples of a crystal oscillator circuit diagram (i) 2725T/2725Q/2725Z/NZ2520SB/NZ2520SD/NF2520SF/NZ2016SA (iii) 2765E VDD ST DIVIDER 1/2N (N = 0 to 3) PLL + SS (SS: Spread spectrum) OUT OUT ST (RUP is incorporated.) (ii) 2775Y/2775W/2785V/2795Y/2795W/2795V PLL OUT ST (RUP is incorporated.) P-ROM cc07_090920_circuit_e