전자부품 데이터시트 검색엔진 |
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CD4541BC 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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CD4541BC 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page www.fairchildsemi.com 2 Truth Table Division Ratio Table Operating Characteristics With Auto Reset pin set to a “0” the counter circuit is initial- ized by turning on power. Or with power already on, the counter circuit is reset when the Master Reset pin is set to a “1”. Both types of reset will result in synchronously reset- ting all counter stages independent of counter state. The RC oscillator frequency is determined by the external RC network, i.e.: and RS ≈ 2 Rtc where RS ≥ 10 kΩ The time select inputs (A and B) provide a two-bit address to output any one of four counter stages (28, 210, 213, and 216). The 2n counts as shown in the Division Ratio Table represent the Q output of the Nth stage of the counter. When A is “1”, 216 is selected for both states of B. However, when B is “0”, normal counting is interrupted and the 9th counter stage receives its clock directly from the oscillator (i.e., effectively outputting 28). The Q/Q select output control pin provides for a choice of output level. When the counter is in a reset condition and Q/Q select pin is set to a “0” the Q output is a “0”. Corre- spondingly, when Q/Q select pin is set to a “1” the Q output is a “1”. When the mode control pin is set to a “1”, the selected count is continually transmitted to the output. But, with mode pin “0” and after a reset condition the RS flip-flop resets (see Logic Diagram), counting commences and after 2n−1 counts the RS flip-flop sets which causes the output to change state. Hence, after another 2n−1 counts the output will not change. Thus, a Master Reset pulse must be applied or a change in the mode pin level is required to reset the single cycle operation. Typical RC Oscillator Characteristics Solid Line = R TC = 56 kΩ, RS = 1 kΩ and C = 1000 pF f = 10.2 kHz @ V DD = 10V and TA = 25° Dashed Line = R TC = 56 kΩ, RS = 120 kΩ and C = 1000 pF f = 7.75 kHz @ V DD = 10V and TA = 25° RC Oscillator Frequency as a Function of RTC and C Line A: f as a function of C and (RTC = 56 kΩ; RS = 120k Line B: f as a function of RTC and (C = 100 pF; RS = 2 RTC Pin State 01 5 Auto Reset Operating Auto Reset Disabled 6 Timer Operational Master Reset On 9 Output Initially Low Output Initially High after Reset after Reset 10 Single Cycle Mode Recycle Mode Number of Count A B Counter Stages 2n n 0 0 13 8192 0 1 10 1024 10 8 256 1 1 16 65536 |
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