JAJSIV8B March 2004 – April 2020 SN74HC00-Q1
PRODUCTION DATA.
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In this application, two 2-input NAND gates are used to create an active-low SR latch as shown in Figure 7. The two additional gates can be used for a second SR latch, or the inputs can be grounded and both channels left unused.
The SN74HC00-Q1 is used to drive the tamper indicator LED and provide one bit of data to the system controller. When the tamper switch outputs LOW, the output Q becomes HIGH. This output remains HIGH until the system controller addresses the event and sends a LOW signal to the R input which returns the Q output back to LOW.