Texas Instruments LM809M3-2.93/NOPB Simple Reset/Power-On Reset, Active Low, Push-Pull Output, 2.93V Threshold, 140ms Minimum Reset Timeout, SOT-23-3, -40°C to 105°C.
| Parameter | Value |
|---|---|
| Type | Simple Reset/Power-On Reset |
| Mounting | Surface Mount |
| Voltage - threshold | 2.93V |
| Number of voltages monitored | 1 |
| Operating temperature | -40°C ~ 105°C (TA) |
| Reset | Active Low |
| Output | Push-Pull, Totem Pole |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Reset timeout | 140ms Minimum |
| Case | TO-236-3, SC-59, SOT-23-3 |
The LM809M3-2.93/NOPB: The 140ms minimum reset timeout gives downstream logic time to stabilize after the supply rail crosses the 2.93V threshold — the processor's oscillator and PLL lock within this window before the reset de-asserts. Push-pull output eliminates the external pull-up resistor required by open-drain supervisors, saving one component per rail and keeping the BOM count low in space-constrained SOT-23-3 layouts.
The reset timeout is a minimum of 140ms. This is the guaranteed duration the reset output stays asserted after the monitored supply recovers above the 2.93V threshold.
When the monitored voltage falls below the 2.93V threshold, the output goes low and remains low for the 140ms timeout period after recovery.
For a drop-in push-pull replacement with the same timeout and threshold, stick with the LM809M3-2.93/NOPB.