66.11 POR Characteristics
The figure below provides a general presentation of Power-On-Reset (POR) characteristics.
When a very slow (versus tRST) supply rising slope is applied on the POR VDD pin, the reset time becomes negligible and the reset signal is released when VDD raises higher than VT+.
When a very fast (versus tRST) supply rising slope is applied on the POR VDD pin, the voltage threshold becomes negligible and the reset signal is released after tRST. It is the smallest possible reset time.
| Symbol | Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| VT+ | Threshold Voltage Rising | – | 1.3 | – | 1.5 | V |
| VT- | Threshold Voltage Falling | – | 1.22 | – | 1.4 | V |
| Vhys | Hysteresis Voltage | – | 50 | – | 160 | mV |
| tRST | Reset Timeout Period | – | 890 | – | 5100 | µs |
| Symbol | Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| VT+ | Threshold Voltage Rising | – | 0.927 | – | 1.075 | V |
| VT- | Threshold Voltage Falling | – | 0.848 | – | 1.025 | V |
| Vhys | Hysteresis Voltage | – | 38 | – | 109 | mV |
| tRST | Reset Timeout Period | – | 150 | – | 650 | µs |
| Symbol | Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| VT+ | Threshold Voltage Rising | – | 1.3 | – | 1.5 | V |
| VT- | Threshold Voltage Falling | – | 1.22 | – | 1.4 | V |
| Vhys | Hysteresis Voltage | – | 50 | – | 160 | mV |
| tRST | Reset Timeout Period | – | 130 | – | 650 | µs |