MAX809R
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Mfr | UMW |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C |
| Type | Voltage Detector |
| Output | Push-Pull, Totem Pole |
| Number of Voltages Monitored | 1 |
| Supplier Device Package | SOT-23 |
| Voltage - Threshold | 2.63V |
| Reset | Active Low |
| Reset Timeout | 150ms Minimum |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | MAX809 |
| Standard Package | 3,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
MAX809 Supervisor Push-Pull, Totem Pole 1 Channel SOT-23
The MAX809 is a low-cost, microprocessor supervisory circuit designed to monitor power supplies in digital systems. It asserts a reset signal whenever the supply voltage drops below a preset threshold, holding the reset state for a fixed delay after the voltage returns to a valid operating level to ensure stable startup for MCUs and logic chips. This 3-pin compact device operates over a wide temperature range, requires minimal external components, and delivers reliable power fault detection for embedded hardware, eliminating the need for discrete resistor-capacitor reset circuits.
Key features
● Fixed reset threshold options cover common supply rails including 2.5V, 3.0V, 3.3V, and 5.0V
● Built-in 140ms typical reset timeout delay
● Open-drain active-low reset output
● Low supply current of only 17µA typical
● Guaranteed reset valid down to VCC=1V
● Small SOT-23 and TO-92 package choices
● Industrial operating temperature range from -40°C to +85°C
FAQ
Q: What is the difference between MAX809 and MAX810?
A: MAX809 has open-drain active-low reset output while MAX810 uses push-pull output.
Q: Can MAX809 work without an external capacitor?
A: Yes, the reset delay is integrated, no external capacitor is required.
Q: How to select the correct threshold variant?
A: Match the reset threshold to your system supply voltage to trigger reset before the MCU enters undefined operating states.
Alternative supervisory circuit parts
1. MAX810: Pin-compatible supervisory IC with push-pull active-low reset output instead of open-drain for simplified circuit connection.
2. MCP809: Drop-in compatible microprocessor reset monitor with similar timing specs and low quiescent current for cost-sensitive designs.
3. IMP809: Supervisory circuit matching MAX809 thresholds and delay, offering alternative sourcing for supply chain redundancy.
4. STM809: STMicroelectronics power reset IC with comparable reset timeout and wide temperature range for industrial embedded systems.
