Overview
The MAX803SQ438T1G, produced by ON Semiconductor, is a cost-effective system supervisor circuit designed to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary. This 3-pin microprocessor reset monitor is optimized for low supply current and high accuracy in voltage monitoring, making it suitable for a variety of applications including computers, embedded systems, and battery-powered equipment.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Range | - | 1.2 | - | 5.5 | V |
| Supply Current (VCC = 3.3 V) | ICC | - | 0.5 | 1.2 | μA |
| Reset Threshold (Vin Decreasing) | - | - | - | - | V |
| Reset Active TimeOut Period | tRP | 1.0 | - | 140 | msec |
| RESET Output Voltage Low | VOL | - | - | 0.3 | V |
| RESET Leakage Current | ILEAK | - | - | 1 | μA |
| Operating Temperature | - | -40 | - | 105 | °C |
Key Features
- Precision VCC monitoring for voltages from 1.2 V to 4.9 V in 100 mV steps
- Four guaranteed minimum power-on reset pulse widths available (1 ms, 20 ms, 100 ms, and 140 ms)
- RESET output guaranteed to VCC = 1.0 V
- Low supply current (0.5 μA at VCC = 3.3 V)
- VCC transient immunity to reject negative-going transients (glitches) on the power supply line
- No external components required
- Wide operating temperature range: −40°C to 105°C
- Pb-free packages available and RoHS compliant
Applications
- Computers
- Embedded Systems
- Battery Powered Equipment
- Critical Microprocessor Power Supply Monitoring
Q & A
- What is the primary function of the MAX803SQ438T1G?
The primary function of the MAX803SQ438T1G is to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary.
- What are the available reset pulse widths for the MAX803SQ438T1G?
The available reset pulse widths are 1 ms, 20 ms, 100 ms, and 140 ms.
- What is the typical supply current of the MAX803SQ438T1G at VCC = 3.3 V?
The typical supply current is 0.5 μA at VCC = 3.3 V.
- How does the MAX803SQ438T1G handle VCC transients?
The MAX803SQ438T1G is designed to reject negative-going transients (glitches) on the power supply line, improving transient immunity.
- What is the operating temperature range of the MAX803SQ438T1G?
The operating temperature range is −40°C to 105°C.
- Are the MAX803SQ438T1G packages Pb-free and RoHS compliant?
- What types of applications is the MAX803SQ438T1G suitable for?
The MAX803SQ438T1G is suitable for computers, embedded systems, battery-powered equipment, and critical microprocessor power supply monitoring.
- Does the MAX803SQ438T1G require any external components?
No, the MAX803SQ438T1G does not require any external components.
- How does the RESET output behave when VCC falls below 1.0 V?
Below VCC = 1.0 V, the RESET output becomes an open circuit and does not sink current.
- Can the transient immunity of the MAX803SQ438T1G be improved?
