For all new designs with TPS3820-xx-Q1, use the TPS3820-xxQPDBVRQ1 part number. The TPS3820-xxQP is
functionally equivalent and a replacement to the TPS3820xxQ. The TPS3820-xxQDBVRQ1 is not
recommended for new designs (NRND).
The TPS382x-xx-Q1 family of supervisors provide circuit
initialization and timing supervision, primarily for DSP and processor-based systems. During power
on, RESET asserts when the supply voltage VDD becomes
greater than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD
and keeps RESET active low as long as VDD remains
below the threshold voltage, VIT−. An internal timer delays the return of
the output to the inactive state (high) to ensure proper system reset. The delay time,
td, starts after VDD has risen above the threshold
voltage VIT−. When the supply voltage drops below the threshold voltage
VIT−, the output becomes active (low) again. No external components are
required. All the devices of this family have a fixed-sense threshold voltage,
VIT–, set by an internal voltage divider. The TPS382x-xx-Q1 family also
offers watchdog time out options of 200 ms (TPS3820-xx-Q1) and 1.6 s (TPS3823/4/8-xx-Q1).