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    • 1. 发明授权
    • Arrangement for parallel programming of in-system programmable IC
logical devices
    • 系统可编程IC逻辑器件的并行编程布置
    • US5329179A
    • 1994-07-12
    • US957311
    • 1992-10-05
    • Howard TangCyrus Tsui
    • Howard TangCyrus Tsui
    • G06F17/50H03K19/177
    • G06F17/5054
    • A plurality of programmable logic devices are connected in parallel to a programming command generator. A device selector connects individual devices with the programming command generator, thereby permitting the individual devices to be programmed without routing the programming data through other devices. In an alternative embodiment, an identification code is used to place the individual device in a condition to receive programming data. Using the teachings of this invention, programming data may initially be entered into a plurality of devices, and then the data entered in all the devices may be used to program the devices simultaneously. This procedure requires less time than entering data and giving each device the execute command in sequence.
    • 多个可编程逻辑器件并行连接到编程命令发生器。 设备选择器将各个设备与编程命令发生器连接,从而允许编程各个设备,而不通过其他设备路由编程数据。 在替代实施例中,使用识别码将单个设备置于接收节目数据的状态。 使用本发明的教导,编程数据可以最初被输入到多个设备中,然后可以使用在所有设备中输入的数据来同时对设备进行编程。 该过程比输入数据需要更少的时间,并且每个设备按顺序给出执行命令。
    • 5. 发明授权
    • TTL buffer circuit incorporating active pull-down transistor
    • 包含有源下拉晶体管的TTL缓冲电路
    • US4634898A
    • 1987-01-06
    • US554474
    • 1983-11-22
    • Gary GouldsberryAlbert ChanCyrus TsuiMark Fitzpatrick
    • Gary GouldsberryAlbert ChanCyrus TsuiMark Fitzpatrick
    • H03K19/013H03K19/088H03K17/04H03K17/60
    • H03K19/013H03K19/0136H03K19/088
    • A unique double inversion buffer has a first means to invert and isolate the digital input signal, a second means to reinvert and further isolate the input signal, and an output means including an output transistor 94. The double inversion buffer is configured with active pull-down means on the output transistor 92. The high-to-low propagation delay time and the low-to-high propagation delay times through the double inversion buffer and reduced by use of the active pull-down means. Rapid turnoff of the output transistor is accomplished by coupling a transistor to its base to instantaneously turn it off. In a preferred embodiment, a clamping circuit 201 is used to hold the output voltage at a maximum predetermined level to further reduce the time it takes to reduce the output voltage to the logical "0" state.
    • 独特的双反相缓冲器具有第一装置,用于反转和隔离数字输入信号,第二装置重新转换并进一步隔离输入信号,以及包括输出晶体管94的输出装置。双反相缓冲器配置有主动上拉电阻, 输出晶体管92的下降装置。通过双重反转缓冲器的高到低的传播延迟时间和低到高的传播延迟时间通过使用有源下拉装置而减少。 输出晶体管的快速关断是通过将晶体管耦合到其基极来实时地将其截止的。 在优选实施例中,钳位电路201用于将输出电压保持在最大预定电平,以进一步减少将输出电压降低到逻辑“0”状态所花费的时间。