JPH01256212A - Two-way buffer circuit - Google Patents

Two-way buffer circuit

Info

Publication number
JPH01256212A
JPH01256212A JP63084713A JP8471388A JPH01256212A JP H01256212 A JPH01256212 A JP H01256212A JP 63084713 A JP63084713 A JP 63084713A JP 8471388 A JP8471388 A JP 8471388A JP H01256212 A JPH01256212 A JP H01256212A
Authority
JP
Japan
Prior art keywords
buffer circuit
input
resistor
level
potential difference
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
JP63084713A
Other languages
Japanese (ja)
Inventor
Hiroo Oshima
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP63084713A priority Critical patent/JPH01256212A/en
Publication of JPH01256212A publication Critical patent/JPH01256212A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To eliminate the need for an external direction switching signal by arranging a resistor to a two-way coupling section of a buffer. circuit, detecting a potential difference generated across a resistor by an analog comparator and controlling an input/output switching terminal of the buffer circuit in real time.
CONSTITUTION: When an 'L' level is outputted from an input/output terminal 15, since a buffer circuit 12 outputs an 'H' level, a potential difference is generated across a resistor 18. When an analog comparator 10 detects the potential difference, an 'H' level is outputted to an input/output switching terminal 13 to turn on a buffer circuit 11 and to turn off the buffer circuit 12 thereby giving the 'L' level signal to an input/output terminal 17. In this case, since a pullup resistor 20 is added to the output of the buffer circuit 12, even when the buffer circuit 12 is turned off, while the 'L' level is outputted from the input/output terminal 15, the potential difference is caused across the resistor 18. Thus, it is not required to apply a signal to the input/output terminal of the two-way buffer circuit externally.
COPYRIGHT: (C)1989,JPO&Japio
JP63084713A 1988-04-06 1988-04-06 Two-way buffer circuit Pending JPH01256212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63084713A JPH01256212A (en) 1988-04-06 1988-04-06 Two-way buffer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63084713A JPH01256212A (en) 1988-04-06 1988-04-06 Two-way buffer circuit

Publications (1)

Publication Number Publication Date
JPH01256212A true JPH01256212A (en) 1989-10-12

Family

ID=13838308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63084713A Pending JPH01256212A (en) 1988-04-06 1988-04-06 Two-way buffer circuit

Country Status (1)

Country Link
JP (1) JPH01256212A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04242387A (en) * 1991-01-17 1992-08-31 Mitsubishi Electric Corp Signal input output device
JPH0738399A (en) * 1993-06-29 1995-02-07 Nec Corp Bidirectional buffer circuit
US5418933A (en) * 1990-02-20 1995-05-23 Sharp Kabushiki Kaisha Bidirectional tri-state data bus buffer control circuit for delaying direction switching at I/O pins of semiconductor integrated circuit
EP0651513B1 (en) * 1993-10-29 1997-08-06 STMicroelectronics S.r.l. Integrated circuit with bidirectional pin
JP2015211068A (en) * 2014-04-24 2015-11-24 ローム株式会社 Semiconductor device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418933A (en) * 1990-02-20 1995-05-23 Sharp Kabushiki Kaisha Bidirectional tri-state data bus buffer control circuit for delaying direction switching at I/O pins of semiconductor integrated circuit
JPH04242387A (en) * 1991-01-17 1992-08-31 Mitsubishi Electric Corp Signal input output device
JPH0738399A (en) * 1993-06-29 1995-02-07 Nec Corp Bidirectional buffer circuit
EP0651513B1 (en) * 1993-10-29 1997-08-06 STMicroelectronics S.r.l. Integrated circuit with bidirectional pin
JP2015211068A (en) * 2014-04-24 2015-11-24 ローム株式会社 Semiconductor device
US10008284B2 (en) 2014-04-24 2018-06-26 Rohm Co., Ltd. Semiconductor device including an interface arranged to perform external data communications

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