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COP87L88FH Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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COP87L88FH Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 45 page Reset (Continued) Oscillator Circuits The chip can be driven by a clock input on the CKI input pin which can be between DC and 10 MHz. The CKO output clock is on pin G7 (crystal configuration). The CKI input fre- quency is divided down by 10 to produce the instruction cycle clock (t c). Figure 7 shows the Crystal and R/C oscillator diagrams. CRYSTAL OSCILLATOR CKI and CKO can be connected to make a closed loop crys- tal (or resonator) controlled oscillator. Table 1 shows the component values required for various standard crystal values. R/C OSCILLATOR By selecting CKI as a single pin oscillator input, a single pin R/C oscillator circuit can be connected to it. CKO is available as a general purpose input, and/or HALT restart input. Table 2 shows the variation in the oscillator frequencies as functions of the component (R and C) values. EXTERNAL OSCILLATOR CKI can be driven by an external clock signal. CKO is avail- able as a general purpose input and/or HALT restart control. TABLE 1. Crystal Oscillator Configuration, T A = 25˚C R1 R2 C1 C2 CKI Freq Conditions (k Ω)(MΩ) (pF) (pF) (MHz) 0 1 30 30–36 10 V CC = 5V 0 1 30 30–36 4 V CC = 5V 0 1 200 100–150 0.455 V CC = 5V TABLE 2. RC Oscillator Configuration, T A = 25˚C R C CKI Freq Instr. Cycle Conditions (k Ω) (pF) (MHz) (µs) 3.3 82 2.2 to 2.7 3.7 to 4.6 V CC = 5V 5.6 100 1.1 to 1.3 7.4 to 9.0 V CC = 5V 6.8 100 0.9 to 1.1 8.8 to 10.8 V CC = 5V Note: 3k ≤ R ≤ 200k 50 pF ≤ C ≤ 200 pF DS101135-8 RC > 5 x Power Supply Rise Time FIGURE 6. Recommended Reset Circuit Crystal Oscillator DS101135-9 External Oscillator DS101135-10 R/C Oscillator DS101135-11 FIGURE 7. Crystal R/C, and External Oscillator Diagrams www.national.com 11 |
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