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COPCH820CJ Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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COPCH820CJ Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 32 page Functional Description (Continued) Oscillator Circuits EXTERNAL OSCILLATOR CKI can be driven by an external clock signal provided it meets the specified duty cycle rise and fall times and input levels CKO is available as a general purpose input G7 andor Halt control CRYSTAL OSCILLATOR By selecting CKO as a clock output CKI and CKO can be connected to create a crystal controlled oscillator Table I shows the component values required for various standard crystal values RC OSCILLATOR By selecting CKI as a single pin oscillator CKI can make a RC oscillator CKO is available as a general purpose input andor HALT control Table II shows variation in the oscilla- tor frequencies as functions of the component (R and C) values TLDD11208 – 7 FIGURE 5 Clock Oscillator Configurations TABLE I Crystal Oscillator Configuration R1 R2 C1 C2 CKI Freq Conditions (kX)(MX) (pF) (pF) (MHz) 0 1 30 30 – 36 10 VCC e 5V 0 1 30 30 – 36 4 VCC e 5V 56 1 100 100 – 156 0455 VCC e 5V TABLE II RC Oscillator Configuration (Part-To-Part Variation) R C CK1 Freq Instr Cycle Conditions (kX) (pF) (MHz) (ms) 33 82 22 to 27 37 to 46 VCC e 5V 56 100 11 to 13 74 to 90 VCC e 5V 68 100 09 to 11 88 to 108 VCC e 5V http www nationalcom 9 |
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