CD4541B Datasheet, PDF (5/9 Pages) Texas Instruments – CMOS PROGRAMMABLE TIMER HIGH VOLTAGE TYPES(20V RATING)

CD4541B
Digital Timer Application
A positive pulse on MASTER RESET resets the counters
and latch. The output goes high and remains high until the
number of pulses, selected by A and B, are counted. This
circuit is retriggerable and is as accurate as the input fre-
quency. If additional accuracy is desired, an external clock
can be used on pin 3. A setup time equal to the width of the
one-shot output is required immediately following initial
power up, during which time the output will be high.
INPUT
R_TC
1
2
C_TC
3
4
R_S AR ₅
MR ₆
7
V_DD
14
13 B
12 A
11
10
9
OUTPUT
8
t
0 10 20 30 40 50 60 70 80 88
82
80
70
60
50
79 - 87
40
(2.007 - 2.210)
30
20
10
0
4 - 10
(0.102 - 0.254)
85 - 93
(2.159 - 2.362)
FIGURE 3. DIGITAL TIMER APPLICATION CIRCUIT
NOTE: Dimensions in parentheses are in millimeters and are de-
rived from the basic inch dimensions as indicated. Grid graduations
are in mils (10^-3 inch).
FIGURE 4. DIMENSIONS AND PAD LAYOUT FOR CD4541B
5