Overview
The TL7757CPK, produced by Texas Instruments, is a supply-voltage supervisor designed for use in microcomputer and microprocessor systems. This component monitors the supply voltage for undervoltage conditions, ensuring that the system operates within defined voltage limits. It features a precision voltage detector and a power-on reset generator, making it essential for maintaining system stability and preventing undefined operation during power-up or voltage drops.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | -0.3 | 20 | V | |
| Operating Free-Air Temperature (TL7757C) | 0 | 70 | °C | |
| Operating Free-Air Temperature (TL7757I) | -40 | 85 | °C | |
| Negative-Going Input Threshold Voltage (VIT-) | 4.43 | 4.55 | 4.67 | V |
| Low Standby Current | 20 | µA | ||
| High Output Sink Capability | 20 | mA | ||
| Propagation Delay Time (Low to High) | 3.4 | 5 | µs | |
| Propagation Delay Time (High to Low) | 2 | 5 | µs | |
| Rise Time | 0.4 | 1 | µs | |
| Fall Time | 0.05 | 1 | µs |
Key Features
- Power-On Reset Generator: Ensures the system resets properly during power-up.
- Automatic Reset Generation After Voltage Drop: Resets the system if the supply voltage drops below the threshold voltage.
- Low Standby Current: Consumes only 20 µA in standby mode.
- Precision Threshold Voltage: 4.55 V ±120 mV, ensuring accurate voltage monitoring.
- High Output Sink Capability: Can sink up to 20 mA, making it suitable for driving various loads.
- Comparator Hysteresis: Prevents erratic resets by providing a stable threshold voltage.
Applications
The TL7757CPK is widely used in microcomputer and microprocessor systems to ensure reliable operation by monitoring the supply voltage. It is particularly useful in:
- Embedded systems requiring precise voltage monitoring.
- Industrial control systems where stable operation is critical.
- Automotive electronics that need robust voltage supervision.
- Medical devices requiring reliable power management.
Q & A
- What is the primary function of the TL7757CPK?
The primary function of the TL7757CPK is to monitor the supply voltage and generate a reset signal if the voltage drops below a specified threshold.
- What is the operating temperature range for the TL7757C and TL7757I versions?
The TL7757C operates from 0°C to 70°C, while the TL7757I operates from -40°C to 85°C.
- What is the precision threshold voltage of the TL7757CPK?
The precision threshold voltage is 4.55 V ±120 mV.
- How much current does the TL7757CPK consume in standby mode?
The TL7757CPK consumes 20 µA in standby mode.
- What is the maximum output sink capability of the TL7757CPK?
The TL7757CPK can sink up to 20 mA.
- What prevents erratic resets in the TL7757CPK?
Comparator hysteresis prevents erratic resets by providing a stable threshold voltage.
- What is the propagation delay time for the low-to-high-level output?
The propagation delay time for the low-to-high-level output is typically 5 µs.
- What is the rise time of the TL7757CPK?
The rise time is typically 1 µs.
- What is the fall time of the TL7757CPK?
The fall time is typically 1 µs.
- In which types of systems is the TL7757CPK commonly used?
The TL7757CPK is commonly used in microcomputer and microprocessor systems, as well as in industrial, automotive, and medical devices.
