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CD4541L-P14-R Scheda tecnica(PDF) 5 Page - Unisonic Technologies

Il numero della parte CD4541L-P14-R
Spiegazioni elettronici  PROGRAMMABLE TIMER
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Produttore elettronici  UTC [Unisonic Technologies]
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CD4541L-P14-R Scheda tecnica(HTML) 5 Page - Unisonic Technologies

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CD4541
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
5 of 7
www.unisonic.com.tw
QW-R502-037.C
OPERATING CHARACTERISTICS
With Auto Reset pin set to a “0” the counter circuit is initialized 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
resetting 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 (2
8, 210, 213,
and 2
16). 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”, 2
16 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 2
8).
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”. Correspondingly, 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
2
n-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.
INTERNAL
RESET
RTC
21
RS
TO CLOCK
CIRCUIT
Oscillator Circuit Using RC Configuration
3
CTC


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