Overview
The LM3704XCMM-308/NOPB is a microprocessor supervisory circuit produced by Texas Instruments. This device is designed to monitor power supplies and battery-controlled functions, ensuring that the system operates within safe voltage ranges. It offers a high degree of flexibility and reliability, making it suitable for various applications, including embedded controllers, intelligent instruments, and automotive systems. The LM3704 does not require external components, simplifying the design and implementation process.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Operating Voltage | 1 | 5.5 | V | |
| VCC Supply Current | 28 | 50 | µA | |
| Reset Threshold (VRST) | 3.08 - 0.5% | 3.08 | 3.08 + 0.5% | V |
| Reset Threshold Accuracy Over Temperature | -2% | +2% | % | |
| Reset Time-Out Period (tRP) | 140 | 200 | 280 | ms |
| Low-Line Output Threshold (VLLOT) | 1.01 × VRST | 1.02 × VRST | 1.03 × VRST | V |
| Power-Fail Comparator Input Threshold (VPFT) | 1.225 V | V | ||
| Package Type | VSSOP-10 | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- No external components required for operation.
- Manual-reset input with internal 56-kΩ pullup.
- Available in both open-drain and push-pull configurations.
- Reset time-out delay of 200 ms.
- Separate power-fail comparator with adjustable threshold.
- Low-line output for early power-fail warning.
- ±0.5% reset threshold accuracy at room temperature and ±2% over temperature.
- Low VCC supply current of 28 µA at room temperature.
Applications
- Embedded controllers and processors.
- Intelligent instruments.
- Automotive systems.
- Critical microprocessor power monitoring.
Q & A
- What is the primary function of the LM3704?
The LM3704 is a microprocessor supervisory circuit designed to monitor power supplies and battery-controlled functions, ensuring the system operates within safe voltage ranges.
- What are the available reset threshold voltages for the LM3704?
The standard reset threshold voltage is 3.08 V, but custom thresholds between 2.2 V and 5 V in 10-mV increments are available upon request.
- Does the LM3704 require external components for operation?
No, the LM3704 does not require external components for operation.
- What is the purpose of the manual-reset input (MR)?
The manual-reset input allows the operator to initiate a reset manually. It is fully debounced and has an internal 56-kΩ pullup.
- What is the reset time-out period of the LM3704?
The reset time-out period is typically 200 ms, with a range of 140 ms to 280 ms over the operating temperature range.
- How does the low-line output function?
The low-line output provides an early power-fail warning by going low when VCC falls below a specified threshold (1.02 × VRST).
- What is the power-fail comparator input threshold?
The power-fail comparator input threshold is 1.225 V, but it can be adjusted using a resistor divider.
- What is the typical VCC supply current of the LM3704?
The typical VCC supply current is 28 µA at room temperature.
- In what package types is the LM3704 available?
The LM3704 is available in a 10-pin VSSOP package.
- What is the operating temperature range of the LM3704?
The operating temperature range is -40°C to 85°C.
