JPH0193834U - - Google Patents
Info
- Publication number
- JPH0193834U JPH0193834U JP18779087U JP18779087U JPH0193834U JP H0193834 U JPH0193834 U JP H0193834U JP 18779087 U JP18779087 U JP 18779087U JP 18779087 U JP18779087 U JP 18779087U JP H0193834 U JPH0193834 U JP H0193834U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- phototransistor
- resistance element
- input terminal
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案の一実施例の回路構成図、第２
図は第１図の各部の電圧波形、第３図は従来の回
路構成図、第４図は第３図の各部の電圧波形であ
る。
１…電源電圧入力端子、２…出力端子、３，４
，６，８…抵抗素子、５…ホトカプラ、７…コン
デンサ、９…バツフア。
Figure 1 is a circuit configuration diagram of an embodiment of the present invention;
The figures show voltage waveforms at various parts in FIG. 1, FIG. 3 is a conventional circuit configuration diagram, and FIG. 4 shows voltage waveforms at various parts in FIG. 1...Power supply voltage input terminal, 2...Output terminal, 3, 4
, 6, 8...resistance element, 5...photocoupler, 7...capacitor, 9...buffer.
Claims (1)
続する第１の抵抗素子と、前記発光ダイオードの
カソードを接地する第２の抵抗素子と、前記発光
ダイオードのアノードを接地するコンデンサと、
前記発光ダイオードのアノードと前記電源入力端
子を接続する第３の抵抗素子と、前記発光ダイオ
ードが発する光によつてベース電流が流れるエミ
ツタが接地されたホトトランジスタと、前記ホト
トランジスタのコレクタと前記電源入力端子とを
接続する第４の抵抗素子と前記ホトトランジスタ
のコレクタに接続され該ホトトランジスタのコレ
クタ電圧を論理信号に変換する論理回路を備え、
前記論理回路の出力をリセツト信号とすることを
特徴とするパワーオンリセツト回路。 a first resistance element that connects a power input terminal and a cathode of the light emitting diode, a second resistance element that grounds the cathode of the light emitting diode, and a capacitor that grounds the anode of the light emitting diode;
a third resistance element connecting the anode of the light emitting diode and the power input terminal; a phototransistor whose emitter is grounded, through which a base current flows due to light emitted by the light emitting diode; a collector of the phototransistor and the power supply; a fourth resistance element connected to the input terminal; and a logic circuit connected to the collector of the phototransistor and converting the collector voltage of the phototransistor into a logic signal;
A power-on reset circuit characterized in that the output of the logic circuit is used as a reset signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18779087U JPH0193834U (en) | 1987-12-11 | 1987-12-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18779087U JPH0193834U (en) | 1987-12-11 | 1987-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0193834U true JPH0193834U (en) | 1989-06-20 |
Family
ID=31478921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18779087U Pending JPH0193834U (en) | 1987-12-11 | 1987-12-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0193834U (en) |
-
1987
- 1987-12-11 JP JP18779087U patent/JPH0193834U/ja active Pending