Datasheet > CD4541BC_02

CD4541BC_02

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
8页	86K
描述
Programmable Timer

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数据手册

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CD4541BC_02 数据手册

Truth Table

Division Ratio Table

State

Number of

Count

2ⁿ

Counter Stages

Auto Reset Operating

Timer Operational

Output Initially Low

after Reset

Auto Reset Disabled

Master Reset On

Output Initially High

after Reset

8192

1024

256

10 Single Cycle Mode

Recycle Mode

65536

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.

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”.

The RC oscillator frequency is determined by the external

RC network, i.e.:

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

and R_S≈ 2 R_tcwhere R_S≥ 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 2ⁿcounts as shown in the Division Ratio Table

represent the Q output of the Nth stage of the counter.

When A is “1”, 2¹⁶is selected for both states of B.

2ⁿ⁻¹counts the RS flip-flop sets which causes the output to

change state. Hence, after another 2ⁿ⁻¹counts 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

RC Oscillator Frequency as a

Function of R_TCand C

Solid Line = R_TC= 56 kΩ, R_S= 1 kΩ and C = 1000 pF

f = 10.2 kHz @ V_DD= 10V and T_A= 25°

Line A: f as a function of C and (R_TC= 56 kΩ; R_S= 120k

Line B: f as a function of R_TCand (C = 100 pF; R_S= 2 R_TC

Dashed Line = R_TC= 56 kΩ, R_S= 120 kΩ and C = 1000 pF

f = 7.75 kHz @ V_DD= 10V and T_A= 25°

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