The MAX709 is an integrated circuit used in +5V, +3.3V, and +3V powered systems to provide system reset during power-up, power-down, and brownout conditions.
The MAX709 provides system reset during power‑up, power‑down, and brown‑out conditions. When the supply voltage (Voc) falls below a selectable reset threshold, the RESET output goes low and holds the processor in reset for at least 140 ms after Voc rises above the threshold. The device operates down to 1 V and is immune to short negative‑going transients, making it suitable for low‑component‑count processor systems.
The monitor is offered in 8‑pin DIP, uMAX and SO packages and supports a wide temperature range (‑40 °C to +85 °C). Electrical specifications include ultra‑low supply currents (35 pA to 65 pA) and selectable reset thresholds (2.55 V to 4.65 V). Typical application circuits add a bypass capacitor on the supply pin and optional pull‑down resistors to ensure a valid RESET output at low voltages.
| Operating Temperature Range | -40 °C to +85 °C |
|---|---|
| Supply Current (MAX709R/S/T) | 35 pA |
| Minimum Power‑On Reset Delay | 140 ms |
| Available Packages | 8‑Pin DIP, uMAX, SO |
The device guarantees a minimum power‑on reset delay of 140 ms.
The RESET output is guaranteed to be in the correct state down to 1 V.
The MAX709 is offered in 8‑pin DIP, uMAX and SO packages.
Typical supply current is 35 pA for the R/S/T versions and 65 pA for the L/M versions.