JPS5696524A - Initial reset system for digital ic - Google Patents

Initial reset system for digital ic

Info

Publication number
JPS5696524A
JPS5696524A JP17328679A JP17328679A JPS5696524A JP S5696524 A JPS5696524 A JP S5696524A JP 17328679 A JP17328679 A JP 17328679A JP 17328679 A JP17328679 A JP 17328679A JP S5696524 A JPS5696524 A JP S5696524A
Authority
JP
Japan
Prior art keywords
signal
input
initial reset
circuit
output
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
JP17328679A
Other languages
Japanese (ja)
Inventor
Mikio Kobayashi
Masamichi Furukawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP17328679A priority Critical patent/JPS5696524A/en
Publication of JPS5696524A publication Critical patent/JPS5696524A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
    • H03K3/037—Bistable circuits
    • H03K3/0375—Bistable circuits provided with means for increasing reliability; for protection; for ensuring a predetermined initial state when the supply voltage has been applied; for storing the actual state when the supply voltage fails

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To make unnecessary a capacitor externally mounted, by providing a plurality of stages of shift registers in a digital IC and taking the final stage output of the shift registers as initial reset pulse. CONSTITUTION:No D input is present to a shift register 13 before the application of a power supply switch 2 and outputs Q1-Qn output a signal in H level. When a switch 2 is closed, a signal of L level is input to an input terminal D of the register 13 and the signal is sequentially shifted. Thus, in the Q output, L level moves sequentially from Q1-Qn, but since an OR gate 14 is inserted with a digital circuit 8, H signal is input to the circuit 8 until the output terminal Qn is at L. When the shift is finished and the output terminal Qn is at L, this L signal is input to the circuit 8 as an initial reset pulse IRS to initialize the circuit 8. Thus, without using externally mounted capacitors, the initial reset pulse can be produced.
JP17328679A 1979-12-28 1979-12-28 Initial reset system for digital ic Pending JPS5696524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17328679A JPS5696524A (en) 1979-12-28 1979-12-28 Initial reset system for digital ic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17328679A JPS5696524A (en) 1979-12-28 1979-12-28 Initial reset system for digital ic

Publications (1)

Publication Number Publication Date
JPS5696524A true JPS5696524A (en) 1981-08-04

Family

ID=15957626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17328679A Pending JPS5696524A (en) 1979-12-28 1979-12-28 Initial reset system for digital ic

Country Status (1)

Country Link
JP (1) JPS5696524A (en)

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