MC74HC4020A_14 Просмотр технического описания (PDF) - ON Semiconductor

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MC74HC4020A_14

14-Stage Binary Ripple Counter

ON Semiconductor 

MC74HC4020A

APPLICATIONS INFORMATION

Time−Base Generator

A 60Hz sinewave obtained through a 1.0 Megohm resistor

connected directly to a standard 120 Vac power line is

applied to the input of the MC54/74HC14A, Schmitt-trigger

inverter. The HC14A squares−up the input waveform and

feeds the HC4020A. 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.

VCC

VCC

120Vac

60Hz

1.0M

≥20pF

1/6 of HC14A

NOTE:

Ground MUST be isolated

by a transformer or

opto−isolator for safety

reasons.

HC4020A

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

Package

Shipping†

MC74HC4020ADG

SOIC−16

(Pb−Free)

48 Units / Rail

MC74HC4020ADR2G

SOIC−16

(Pb−Free)

2500 / Tape & Reel

MC74HC4020ADTR2G

TSSOP−16

(Pb−Free)

2500 / Tape & Reel

NLV74HC4020ADTR2G*

TSSOP−16

(Pb−Free)

2500 / Tape & 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.

http://onsemi.com

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