ZHCSGY8B October 2017 – July 2018 UCC21520-Q1
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
Setting the DISABLE pin high shuts down both outputs simultaneously. Grounding (or left open) the DISABLE pin allows the UCC21520-Q1 to operate normally. The DISABLE response time is in the range of 20ns and quite responsive , which is as fast as propagation delay. The DISABLE pin is only functional (and necessary) when VCCI stays above the UVLO threshold. It is recommended to tie this pin to ground if the DISABLE pin is not used to achieve better noise immunity, and it is recommended to bypass using a ≈1nF low ESR/ESL capacitor close to DIS pin when connecting DIS pin to a micro controller with distance.