MC74HC4040A_14 데이터 시트보기 (PDF) - ON Semiconductor

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MC74HC4040A_14

12-Stage Binary Ripple Counter

ON Semiconductor 

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.

VCC

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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