HCF4541 STMicroelectronics, HCF4541 Datasheet - Page 6

• Manufacturer Part Number: HCF4541
• Description: PROGRAMMABLE TIMER
• Manufacturer: STMicroelectronics

DIGITAL TIMER APPLICATION
FREQUENCY SELECTION TABLE
HCC/HCF4541B
6/11
A
0
0
1
1
B
0
1
0
1
N of Stages
13
10
18
16
N
Count
65536
8192
1024
256
2
N
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.
TRUTH TABLE
Pin
10
5
6
9
Single Transition Mode
Low After Reset (Q)
Master Reset Off
Auto Reset On
Output Initially
0
State
High After Reset (Q)
Auto Reset Disabl e
Master Reset On
Output Initially
Recycle Mode
1