JPS5731227A - Power on clearing circuit - Google Patents

Power on clearing circuit

Info

Publication number
JPS5731227A
JPS5731227A JP10609580A JP10609580A JPS5731227A JP S5731227 A JPS5731227 A JP S5731227A JP 10609580 A JP10609580 A JP 10609580A JP 10609580 A JP10609580 A JP 10609580A JP S5731227 A JPS5731227 A JP S5731227A
Authority
JP
Japan
Prior art keywords
capacitor
potential
resistance
point
clear signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10609580A
Other languages
Japanese (ja)
Inventor
Tadao Kadowaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP10609580A priority Critical patent/JPS5731227A/en
Publication of JPS5731227A publication Critical patent/JPS5731227A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To avoid the erroneous production of the clear signal to the fluctuation of the power supply voltage caused by the switching of load, by performing the switching of the time constant through a rectifying element in accordance with the charging and discharging of a capacitor. CONSTITUTION:When a power source 14 is applied, a capacitor 15 is charged by the source 14 and a diode 18 is set forward. Thus the potential at the point 20 is stabilized at VSS from VDD at the moment of application of the source 14 and after a time of resistance 16 X capacity 15. A transient phenomenon of the potential at the point 20 is detected, and the waveform shaping is carried out by an inverter 19 to obtain a clear signal. On the other hand, the charge of the capacitor 15 is discharged with an increment of the load. In this case, the diode 18 is set backward, and the time constant is set to (resistance 16 + resistance 17) X capacity to increase. As a result, the reduction of the potential can be extremely reduced at the point 20 and cannot exceed the logic level of the inverter 19. Thus no clear signal is produced.
JP10609580A 1980-08-01 1980-08-01 Power on clearing circuit Pending JPS5731227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10609580A JPS5731227A (en) 1980-08-01 1980-08-01 Power on clearing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10609580A JPS5731227A (en) 1980-08-01 1980-08-01 Power on clearing circuit

Publications (1)

Publication Number Publication Date
JPS5731227A true JPS5731227A (en) 1982-02-19

Family

ID=14424968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10609580A Pending JPS5731227A (en) 1980-08-01 1980-08-01 Power on clearing circuit

Country Status (1)

Country Link
JP (1) JPS5731227A (en)

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