JPS5669923A - Voltage comparing circuit and power-on clear circuit using it - Google Patents

Voltage comparing circuit and power-on clear circuit using it

Info

Publication number
JPS5669923A
JPS5669923A JP14539079A JP14539079A JPS5669923A JP S5669923 A JPS5669923 A JP S5669923A JP 14539079 A JP14539079 A JP 14539079A JP 14539079 A JP14539079 A JP 14539079A JP S5669923 A JPS5669923 A JP S5669923A
Authority
JP
Japan
Prior art keywords
vss
vdd
vin
circuit
voltage
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
JP14539079A
Other languages
Japanese (ja)
Inventor
Masanari Kaizuka
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 JP14539079A priority Critical patent/JPS5669923A/en
Publication of JPS5669923A publication Critical patent/JPS5669923A/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
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356—Bistable circuits
    • H03K3/3565—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To eliminate an influence of the drop of an electric power voltage by making a double flip-flop connection between two stages of inverters and by comparing a battery voltage with a boosted voltage for driving liquid crystals. CONSTITUTION:When input voltage Vin is less than VDD and greater than VSS, the 2nd transistor 11 and 4th transistor 15 are on and off respectively and Va and Vb are -VSS and VDD respectively. When VSS=Vin, transistors 11 and 15 are both off and Va and Vb are held at the potentials by the electrostatic capacity. When VDD>VSS>Vin, transistor 11 and 15 are off and on respectively and Va and Vb are VDD and -Vss respectively. Therefore, there is the operating point nearly at electric power voltage VSS and input voltage Vin can be detected accurately.
JP14539079A 1979-11-12 1979-11-12 Voltage comparing circuit and power-on clear circuit using it Pending JPS5669923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14539079A JPS5669923A (en) 1979-11-12 1979-11-12 Voltage comparing circuit and power-on clear circuit using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14539079A JPS5669923A (en) 1979-11-12 1979-11-12 Voltage comparing circuit and power-on clear circuit using it

Publications (1)

Publication Number Publication Date
JPS5669923A true JPS5669923A (en) 1981-06-11

Family

ID=15384137

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14539079A Pending JPS5669923A (en) 1979-11-12 1979-11-12 Voltage comparing circuit and power-on clear circuit using it

Country Status (1)

Country Link
JP (1) JPS5669923A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1324340A1 (en) * 2001-12-28 2003-07-02 STMicroelectronics S.r.l. Static RAM with flash-clear function

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48104448A (en) * 1972-02-18 1973-12-27
JPS4973644A (en) * 1972-10-13 1974-07-16

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48104448A (en) * 1972-02-18 1973-12-27
JPS4973644A (en) * 1972-10-13 1974-07-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1324340A1 (en) * 2001-12-28 2003-07-02 STMicroelectronics S.r.l. Static RAM with flash-clear function
US6963499B2 (en) 2001-12-28 2005-11-08 Stmicroelectronics S.R.L. Static RAM with flash-clear function

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