ZHCSRI6D August 1997 – April 2021 CD54HC27 , CD74HC27
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
In this application, two 3-input NOR gates are used to create an SR latch as shown in GUID-A2642082-4A2C-4A3A-8EFD-F018709790EC.html#APP1_SCHEM. The additional gate can be used for another application, or the inputs can be grounded and the channel left unused.
This device is used to drive the tamper indicator LED and provide one bit of data to the system controller. When the tamper switch outputs HIGH, the output Q becomes HIGH. This output remains HIGH until the system controller addresses the event and sends a HIGH signal to the R input which returns the Q output back to LOW.