MC14541B
5
EXPANDED BLOCK DIAGRAM
A12
B13
R
tc
1
C
tc
2
R
S
3
5
AUTO RESET
OSC
RESET
C
2
8
8-STAGE
COUNTER
RESET
POWER-ON
RESET
6
MASTER RESET
2
10
2
13
2
16
C 8-STAGE
COUNTER
RESET
1 OF 4
MUX
10
MODE
9
Q/Q
SELECT
8Q
V
DD
= PIN 14
V
SS
= PIN 7
FREQUENCY SELECTION TABLE
A
B
Number of
Counter Stages
n
Count
2
n
0
0
13
8192
0
1
10
1024
1
0
8
256
1
1
16
65536
TRUTH TABLE
Pin
State
0
1
Auto Reset,
5 Auto Reset
Operating
Auto Reset Disabled
Master Reset, 6 Timer Operational
Master Reset On
Q / Q,
9 Output Initially Low
After Reset
Output Initially High
After Reset
Mode,
10 Single Cycle Mode
Recycle Mode
Figure 3. Oscillator Circuit Using RC Configuration
3
R
S
R
TC
C
tc
2
1
TO CLOCK
CIRCUIT
INTERNAL
RESET
