7.3.1 All Interfaces

Table 7-4. AC Timing Characteristics – All InterfacesApplicable over the recommended operating range from T_A = -40°C to +125°C, V_CC = +2.7V to +5.5V.
Parameters	Symbol	Min.	Typ.	Max.	Units	Type⁽⁴⁾
Wake-up Time from Sleep State. V_CC > 2.7V	t_PU.SLEEP⁽¹⁾	—	3	6.0	ms	A
Power-up Time from V_CC < 2.7V	t_PU.POWERON⁽¹⁾	—	4	6.0	ms	A
Idle Tmer	t_IDLE⁽²⁾	0.85	1	1.15	s	B
Rate at which the Nonvolatile Portion of Monotonic Counter Increments	t_MONOTONIC	42	51	60	s	B
Noise Suppression on RESET Input Pin	t_{RESET_NOISE}⁽³⁾	0	—	0.150	µs	A
Minimum Allowed Reset Pulse	t_{RESET_MIN}⁽³⁾	1.0	—	—	µs	A
GPIO_3 Transition Ignored, Measured Starting with the Last Bit of Power (Sleep)	t_{SLEEP_WAKE}	—	—	250	µs	A
Low-Pulse Width for GPIO_3 High to Wake TA101	t_{WAKE_GPIO_LOW}	40	—	—	µs	A
Watchdog Time-out Value	t_WATCHDOG	900	1000	1100	ms	B

Note:

Various situations can cause the power-up delays to exceed these parameters as follows:
- If the power-on or the wake self-test functions are enabled in the configuration area, the execution of those self-test operations will increase the delay.
- If an internal failure occurs to cause a boot event, then, there may be an additional delay during the boot to write the internal failure log in the nonvolatile memory within the chip.
- If a device update is started but does not complete due to a power interruption, on the next power-up, some clean-up may be required and may take additional time.
- If the 1-minute timer is enabled and is being updated in the nonvolatile memory concurrent with the wake event, the device will accept an Input command after t_{PU_SLEEP}/t_{PU_POWERON} but will not start the execution of that command until the nonvolatile update is complete.
The idle timer specifications here assume that the idle timer is enabled and configured for 1 second. It is recommended that these times be multiplied by the delay time value set in the idle timer configuration field if that is not 1.
All noise pulses ≤ t_{RESET_NOISE} are assured to be suppressed. All pulse widths ≥ t_{RESET_MIN} are assured to pass to the device. Pulses in between these values may or may not be suppressed.
Type Means: A = 100% Tested, B = Characterized