Abstract: A delay line with some external logic can be combined to implement a one-shot function. This article outlines how to perform this configuration and make the required calculations to develop the pulse width needed for a certain application. The article gives an example of a one-shot developed using a fixed delay line for a fixed one-shot output. Programmable delay lines such as the DS1020, DS1021 and DS1023 are available, which could be configured in the same manner to provide a programmable one-shot circuit which could be used as the duty cycle modulator in a pulse-width modulator (PWM) circuit. Some external logic can be combined with a delay line to implement a one-shot function. This approach has the advantage that it eliminates the need for RC timing components and can offer improved accuracy. If a tapped delay line is used, it can be combined with a multiplexer, DIP switches, or jumpers to offer several different output pulse widths, under system control or hard-wired. The realizable accuracy will be determined by how the logic is implemented and the associated propagation delays through it compared to the chosen delay time. Ideally, the external propagation delays should be small compared to the delay time, in which case the output pulse width will be close to the delay time used. The various propagation delays have the following effects on overall system performance: the inverter propagation delay (tPD1) directly affects the output pulse width; the NOR gate propagation delay (tPD2), in conjunction with the inverter propagation delay, will affect the skew between input and output. TTL logic, although easy to implement, suffers from relatively large propagation delays depending on family, (e.g., LS, FAST) and from wide tolerances at room temperature and over the operating range. For shorter pulse widths and tighter tolerance, it may be preferable to implement the function using discrete transistors (RTL). One member of the Silicon Timed Circuit family, the DS1040 preconfigured as a one-shot, and offers similar functionality without requiring external components. 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오. 자동 업데이트 관심있는 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트 받고 싶으세요? 그렇다면 EE-Mail™을 신청하십시오. 추가 정보   APP 977: Feb 22, 2002 DS1020 프로그래밍 가능한 8비트 실리콘 딜레이 라인 전체 데이터 시트 (PDF, 200kB) DS1021 프로그래밍 가능한 8비트 실리콘 딜레이 라인 전체 데이터 시트 (PDF, 208kB) DS1023 프로그래밍 가능한 8비트 타이밍 소자 전체 데이터 시트 (PDF, 256kB) 무료 샘플 DS1040 프로그래밍 가능한 원샷 펄스 발생기 전체 데이터 시트 (PDF, 160kB) DS1100 5탭의 경제적인 타이밍 소자 (딜레이 라인) 전체 데이터 시트 (PDF, 168kB) 무료 샘플 DS1135 3-in-1 고속 실리콘 딜레이 라인 전체 데이터 시트 (PDF, 136kB) 무료 샘플   다운로드, PDF 형식 (33kB)  AN977, AN 977, APP977, Appnote977, Appnote 977