JPS645535U - - Google Patents
Info
- Publication number
- JPS645535U JPS645535U JP9958387U JP9958387U JPS645535U JP S645535 U JPS645535 U JP S645535U JP 9958387 U JP9958387 U JP 9958387U JP 9958387 U JP9958387 U JP 9958387U JP S645535 U JPS645535 U JP S645535U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- external resistor
- external
- divider circuit
- alternative signal
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案に係わるタイマＩＣの内部構成
を示す回路図、第２図は従来のタイマＩＣにおけ
る内部構成を示す回路図である。
１…タイマＩＣ、１１…タイマ回路、１２…信
号処理回路、Ｒｘ…外付け抵抗器、ＤＶｘ…外部
端子、Ｒ１１，Ｒ１２，Ｒ２１，Ｒ２２，Ｒ３１
，Ｒ３２…集積抵抗器、ＲＬ…抵抗分圧回路を構
成する集積抵抗器、Ｃ１〜Ｃ３…コンパレータ。
FIG. 1 is a circuit diagram showing the internal structure of a timer IC according to the present invention, and FIG. 2 is a circuit diagram showing the internal structure of a conventional timer IC. 1... Timer IC, 11... Timer circuit, 12... Signal processing circuit, R x ... External resistor, DV x ... External terminal, R 11 , R 12 , R 21 , R 22 , R 31
, R32 ...integrated resistor, RL...integrated resistor constituting a resistance voltage divider circuit, C1 - C3 ...comparator.
Claims (1)
端子と、 前記外部端子に接続された外付け抵抗器をその
一部に含み、かつ該外付け抵抗器の抵抗値に応じ
て異なる電圧を生成する抵抗分圧回路と、 前記抵抗分圧回路の生成電圧を複数の基準電圧
と比較して、いずれの電圧範囲かを示す択一信号
を生成する電圧範囲判別回路と、 を備え、前記択一信号に基づいて分周比設定を
行なうことを特徴とするタイマＩＣ。[Claims for Utility Model Registration] Includes an external terminal provided for connecting an external resistor and an external resistor connected to the external terminal, and the resistance of the external resistor a resistive voltage divider circuit that generates different voltages depending on the voltage; and a voltage range discrimination circuit that compares the voltage generated by the resistive voltage divider circuit with a plurality of reference voltages and generates an alternative signal indicating which voltage range it is in. A timer IC comprising: and a frequency division ratio setting based on the alternative signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9958387U JPS645535U (en) | 1987-06-29 | 1987-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9958387U JPS645535U (en) | 1987-06-29 | 1987-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS645535U true JPS645535U (en) | 1989-01-12 |
Family
ID=31326876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9958387U Pending JPS645535U (en) | 1987-06-29 | 1987-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS645535U (en) |
-
1987
- 1987-06-29 JP JP9958387U patent/JPS645535U/ja active Pending
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