HCC4541B Просмотр технического описания (PDF) - STMicroelectronics

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HCC4541B

PROGRAMMABLE TIMER

STMicroelectronics 

HCC/HCF4541B

DIGITAL TIMER APPLICATION

A positive MASTER RESET pulse clears the

counters and latch. The output goes high and keeps

up till the number of pulses, selected by A and B, are

counted. This circuit is retriggerable and is as accur-

ate as the input frequency. If a more accurate circuit

is desired, an external clock can be used on pin 3.

A set-up time equal to the width of the one shot out-

put is required immediately following initial power

up, during which time the output will be high.

FREQUENCY SELECTION TABLE

A

B

0

0

0

1

1

0

1

1

N° of Stages

N

13

10

18

16

Count

2N

8192

1024

256

65536

TRUTH TABLE

State

Pi n

0

1

5

Auto Reset On

Auto Reset Disable

6

Master Reset Off

Master Reset On

9

Output Initially

Low After Reset (Q)

Output Initially

High After Reset (Q)

10 Single Transition Mode

Recycle Mode

6/11

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