发明授权
- 专利标题: Constant pulse width generator
- 专利标题(中): 恒脉冲发生器
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申请号: US884688申请日: 1986-07-11
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公开(公告)号: US4767947A公开(公告)日: 1988-08-30
- 发明人: Ashwin H. Shah
- 申请人: Ashwin H. Shah
- 申请人地址: TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: TX Dallas
- 主分类号: G11C7/22
- IPC分类号: G11C7/22 ; G11C8/18 ; H03K3/017 ; H03K3/284
摘要:
Constant pulse width generator having applicability to a static random access memory (SRAM) where a constant width output pulse is desired, regardless of the address line activity, until reset, for powering up peripheral circuits of the static random access memory when an input address changes. An exclusive-NOR circuit has address inputs including the address line and the address line delayed. The constant pulse width generator comprises a monostable delayed feedback loop which is provided on the output of the exclusive-NOR circuit, with the output of the loop changing only upon receipt of a change of state from the exclusive NOR circuit, otherwise remaining stable until the delay resets the output. The output of the constant pulse width generator is a pulse as wide as the delay introduced in the address input signal.