Overview
The LP3470M5X-4.63/NOPB is a micropower voltage supervisory circuit produced by Texas Instruments. This device is designed to monitor voltages within 1% of the reset threshold over temperature, providing maximum adjustability for power-on-reset (POR) and supervisory functions. It is particularly useful in battery-powered microprocessor and other digital systems due to its small size and low quiescent current.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 5-Pin SOT-23 |
| Reset Output | Open-Drain |
| Reset Threshold Accuracy | ±1% over temperature |
| Quiescent Current | 16 µA typical |
| Reset Valid Down to VCC | 0.5 V |
| Reset Time-Out Period | Programmable using an external capacitor |
| Immunity to VCC Transients | Immune to short VCC transients |
| Reset Threshold Voltage Options | 2.63 V, 2.93 V, 3.08 V, 3.65 V, 4 V, 4.38 V, 4.63 V |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Programmable reset time-out period using an external capacitor
- Open-drain reset output
- ±1% reset threshold accuracy over temperature
- Low quiescent current (16 µA typical)
- Reset valid down to VCC = 0.5 V
- Immune to short VCC transients
- Available in six standard reset threshold voltage options
Applications
- Critical microprocessor and microcontroller power monitoring
- Intelligent instruments
- Computers
- Portable and battery-powered equipment
- Battery-powered microprocessor and digital systems
Q & A
- What is the primary function of the LP3470M5X-4.63/NOPB?
The primary function is to monitor the supply voltage and assert a reset signal if the voltage falls below a specified threshold.
- What is the package type of the LP3470M5X-4.63/NOPB?
The package type is 5-Pin SOT-23.
- How is the reset time-out period adjusted?
The reset time-out period is adjustable using an external capacitor.
- What is the quiescent current of the LP3470M5X-4.63/NOPB?
The quiescent current is 16 µA typical.
- Is the LP3470M5X-4.63/NOPB immune to VCC transients?
Yes, it is immune to short VCC transients.
- What are the available reset threshold voltage options for the LP3470M5X-4.63/NOPB?
The options are 2.63 V, 2.93 V, 3.08 V, 3.65 V, 4 V, 4.38 V, and 4.63 V.
- What is the operating temperature range of the LP3470M5X-4.63/NOPB?
The operating temperature range is -40°C to 85°C.
- How does the LP3470M5X-4.63/NOPB handle brownout conditions?
During a brownout condition, the reset signal goes low and remains low for a time period programmed by the external capacitor after VCC returns above the threshold voltage.
- What type of reset output does the LP3470M5X-4.63/NOPB have?
The reset output is open-drain.
- Why is a pullup resistor required for the reset output?
A pullup resistor is required to ensure the reset output goes to a logic high state when the reset signal is deasserted.
