50.4.5 Reset, WDT, Oscillator Start-Up Timer, Power-Up Timer, Brown-Out Reset and Low-Power Brown-Out Reset Specifications

Figure 50-7. Reset, Watchdog Timer, Oscillator Start-Up Timer and Power-Up Timer Timing

Figure 50-8. Brown-out Reset Timing and Characteristics


Standard Operating Conditions (unless otherwise stated)
Param No.	Sym.	Characteristic	Min.	Typ. †	Max.	Units	Conditions
RST01*	T_MCLR	MCLR Pulse Width Low to ensure Reset	2.0	0.4	—	μs
RST02*	T_IOZ	I/O high-impedance from Reset detection	—	—	2.0	μs
RST03*	T_WDT	Watchdog Timer Time-out Period	—	2.0	—	ms	WDTCPS = `'b00001`
RST04*	T_PWRT	Power-up Timer Period	—	65.0	—	ms	PWRTS = `'b10`
RST05*	T_OST	Oscillator Start-up Timer Period^(1,2)	—	1024	—	T_OSC
RST06	V_BOR	Brown-out Reset Voltage	2.7	2.85	3.0	V	BORV = `'b00`
RST06A			2.55	2.7	2.85	V	BORV = `'b01`
RST06B			2.3	2.45	2.6	V	BORV = `'b10`
RST06C			1.8	1.9	2.1	V	BORV = `'b11`
RST07	V_BORHYS	Brown-out Reset Hysteresis	—	60.0	—	mV	BORV = `'b00`
RST08*	T_BORDC	Brown-out Reset Response Time	—	3.0	—	μs
RST09	V_LPBOR	Low-Power Brown-out Reset Voltage	1.6	1.9	2.4	V
RST09A*	V_LPBORHYS	Low-Power Brown-out Reset Hysteresis	—	30.0	—	mV
* These parameters are characterized but not tested. † Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested. Note: By design, the Oscillator Start-up Timer (OST) counts the first 1024 cycles, independent of frequency. To ensure these voltage tolerances, V_DD and V_SS must be capacitively decoupled as close to the device as possible. 0.1 μF and 0.01 μF values in parallel are recommended.