The CAT809 and CAT810 are µP supervisory circuits that monitor power supplies in digital systems. They are direct replacements for the MAX809 and MAX810 in applications operating over the industrial temperature range. These devices generate a reset signal, which is asserted while the power supply voltage is below a preset threshold level and for at least 140 ms after the power supply level has risen above that level.
The CAT809 and CAT810 are microprocessor supervisory circuits that monitor power‑supply voltages and generate a reset signal when the voltage falls below a selectable threshold. They are direct replacements for the MAX809/MAX810 and are offered in compact 3‑pin SOT23 and SC70 packages.
These devices operate over an industrial temperature range of –40 °C to +85 °C and provide precision monitoring of +5 V, +3.3 V, +3.0 V and +2.5 V supplies with various tolerance options. The CAT809 provides an active‑LOW reset output, while the CAT810 provides an active‑HIGH reset output, both with a minimum reset active timeout of 140 ms.
| Operating temperature range | -40 °C to +85 °C |
|---|---|
| Reset polarity (CAT809) | Active LOW |
| Reset polarity (CAT810) | Active HIGH |
| Package types | 3‑pin SOT23 and SC70 |
| Lead soldering temperature (10 s) | 300 °C |
The CAT809 provides an active‑LOW reset output.
The CAT810 provides an active‑HIGH reset output.
They operate from –40 °C to +85 °C.