JPS5545250A - Timer circuit - Google Patents

Timer circuit

Info

Publication number
JPS5545250A
JPS5545250A JP11838678A JP11838678A JPS5545250A JP S5545250 A JPS5545250 A JP S5545250A JP 11838678 A JP11838678 A JP 11838678A JP 11838678 A JP11838678 A JP 11838678A JP S5545250 A JPS5545250 A JP S5545250A
Authority
JP
Japan
Prior art keywords
circuit
power source
voltage
resistances
constant current
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
JP11838678A
Other languages
Japanese (ja)
Inventor
Hideharu Tezuka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11838678A priority Critical patent/JPS5545250A/en
Publication of JPS5545250A publication Critical patent/JPS5545250A/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
    • H03K17/28—Modifications for introducing a time delay before switching

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To obtain a precise timer time set circuit stable for the fluctuation of a power source voltage by comparing the charge potential of a capacitor, which is charged with a constant current, with the potential of a voltage dividing circuit connected to the power source through a PN junction element. CONSTITUTION:For the purpose of causing the current flowed to output-side transistor Tr12 of current mirror circuit 14 with the current flowed to input-side Tr11, Tr13 is inserted to charge capacitor 18 with constant current I3, and its charge potential VC'' is applied to the inversion input of voltage comparator curcuit 19. Power source voltage VCC is connected to a voltage dividing circuit, which is constituted by resistances 22 and 23, through diode-connected Tr20 and 21. Reference voltage V'REF is applied from the connection point of resistances 22 and 23 to the non-inversion input of circuit 19. When switch 24 is opened and charge potential V''C of C18 is higher than reference voltage V'REF, output S of circuit 19 becomes 0, a timer time is set. Since C18 is charged with the constant current, the timer time can be set precisely; and since this time is determined by only C18 and resistances 16, 22 and 23, it is not affected by the fluctuation of the power source voltage.
JP11838678A 1978-09-26 1978-09-26 Timer circuit Pending JPS5545250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11838678A JPS5545250A (en) 1978-09-26 1978-09-26 Timer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11838678A JPS5545250A (en) 1978-09-26 1978-09-26 Timer circuit

Publications (1)

Publication Number Publication Date
JPS5545250A true JPS5545250A (en) 1980-03-29

Family

ID=14735399

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11838678A Pending JPS5545250A (en) 1978-09-26 1978-09-26 Timer circuit

Country Status (1)

Country Link
JP (1) JPS5545250A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01268312A (en) * 1988-04-20 1989-10-26 Matsushita Electric Ind Co Ltd Timer circuit
JPH0334619A (en) * 1989-06-29 1991-02-14 Nec Corp Cr oscillator circuit
KR100825336B1 (en) * 2004-12-10 2008-04-28 미쓰비시덴키 가부시키가이샤 Semiconductor circuit
JP2010020818A (en) * 2008-07-08 2010-01-28 Spansion Llc Semiconductor device and method of controlling the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01268312A (en) * 1988-04-20 1989-10-26 Matsushita Electric Ind Co Ltd Timer circuit
JPH0334619A (en) * 1989-06-29 1991-02-14 Nec Corp Cr oscillator circuit
KR100825336B1 (en) * 2004-12-10 2008-04-28 미쓰비시덴키 가부시키가이샤 Semiconductor circuit
JP2010020818A (en) * 2008-07-08 2010-01-28 Spansion Llc Semiconductor device and method of controlling the same

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