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    • 5. 发明授权
    • ECL programmable logic array with direct testing means for verification
of programmed state
    • ECL可编程逻辑阵列,具有用于验证编程状态的直接测试手段
    • US4864165A
    • 1989-09-05
    • US141239
    • 1988-01-05
    • Barry A. HobermanWilliam E. Moss
    • Barry A. HobermanWilliam E. Moss
    • H03K19/173G06F7/00H03K19/00H03K19/018H03K19/177
    • H03K19/0016H03K19/01806H03K19/17708
    • A novel ECL Programmable Logic Array (PLA) is provided which operates as an ECL PLA, having ECL voltage level compatible input and output leads, thereby providing a high-speed PLA. A unique programming means is provided which allows the ECL PLA to be programmed using TTL-compatible programming voltage levels, such as are provided by common and inexpensive prior art TTL PLA programmers. In another embodiment higher speed is achieved by the design of each sense amplifier using emitter function logic such that the sense transistor and load functions a cascode amplifier. In another embodiment a lower power PLA device is achieved by utilizing a switched current source pull down means for pulling down the rows of the PLA array. In another embodiment low power and user convenience is achieved by allowing each pair of output terminals to share a predefined set of product terms. In another embodiment of this invention, each output terminal is capable of having its output polarity programmed, in order to provide either a desired product term, or the inverse of that product term.
    • 提供了一种新型的ECL可编程逻辑阵列(PLA),其作为ECL PLA工作,具有ECL电压电平兼容的输入和输出引线,从而提供高速PLA。 提供了一种独特的编程手段,使得ECL PLA可以使用TTL兼容的编程电压电平进行编程,例如由普通和便宜的现有技术TTL PLA编程器提供。 在另一个实施例中,通过使用发射器功能逻辑的每个读出放大器的设计实现更高的速度,使得感测晶体管和负载对共源共栅放大器起作用。 在另一个实施例中,通过利用用于下拉PLA阵列的行的开关电流源下拉装置来实现较低功率的PLA装置。 在另一个实施例中,通过允许每对输出终端共享预定义的一组产品项来实现低功率和用户便利性。 在本发明的另一个实施例中,每个输出端子能够对其输出极性进行编程,以便提供期望的乘积项或该乘积项的倒数。