The DS1233 EconoReset is a microprocessor power monitor and external reset controller that uses a precision temperature-compensated reference and voltage sensor to monitor the status of a 5V power supply. When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350ms to allow the power supply and processor to stabilize.
The DS1233 EconoReset monitors two critical conditions for a microprocessor: the supply voltage and an external push‑button override. It uses a precision temperature‑compensated reference to detect out‑of‑tolerance power conditions and holds the reset line active for about 350 ms after the supply returns to normal, allowing the processor to stabilize.
The device also debounces a push‑button and generates a 350 ms reset pulse on release. Recommended external components include a 100 pF‑0.01 µF capacitor between RST and ground and, when additional reset current is needed, a 1 kΩ pull‑up resistor. The IC is offered in low‑cost TO‑92 or surface‑mount SOT‑223 packages.
| Supply Voltage (VCC) | 1.2 V – 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Reset Active Time | 250 ms – 450 ms (typical 350 ms) |
| Internal Pull‑Up Resistor (R P) | 3.75 kΩ – 6.25 kΩ |
| Output Current @ 0.4 V | 8 mA |
The DS1233 holds the reset line active for about 350 ms after power returns to an in‑tolerance condition.