MC74HC4040A_14 Datasheet, PDF (6/8 Pages) ON Semiconductor – 12-Stage Binary Ripple Counter

MC74HC4040A
APPLICATIONS INFORMATION
Time−Base Generator
A 60Hz sinewave obtained through a 100 K resistor
connected to a 120 Vac power line through a step down
transformer is applied to the input of the MC54/74HC14A,
Schmitt-trigger inverter. The HC14A squares−up the input
waveform and feeds the HC4040A. Selecting outputs Q5,
Q10, Q11, and Q12 causes a reset every 3600 clocks. The
HC20 decodes the counter outputs, produces a single
(narrow) output pulse, and resets the binary counter. The
resulting output frequency is 1.0 pulse/minute.
120Vac
60Hz
1.0M
≥20pF
NOTE:
Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
V_CC
HC4040A
13
Clock
Q5
12
Q10
10
Q11
9
Q12
1.0 Pulse/Minute
1
1/2
HC20
8
2
4
5
1/2
HC20
6
Output
Figure 8. Time−Base Generator
ORDERING INFORMATION
Device
MC74HC4040ADG
Package
SOIC−16
(Pb−Free)
Shipping^†
48 Units / Rail
MC74HC4040ADR2G
SOIC−16
(Pb−Free)
2500 Units / Reel
NLV74HC4040ADR2G*
SOIC−16
(Pb−Free)
2500 Units / Reel
MC74HC4040ADTR2G
TSSOP−16
(Pb−Free)
2500 Units / Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP
Capable.
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