Overview
The TL7705ACDRE4 is a supply-voltage supervisor integrated circuit designed by Texas Instruments. It is part of the TL77xxA family, which is specifically intended for use as reset controllers in microcomputer systems. This device ensures that the system resets properly during power-up and power-down sequences, and it monitors the supply voltage to prevent the system from operating under undervoltage conditions.
The TL7705ACDRE4 is particularly suited for TTL-systems and microcomputer systems that require a 5-volt supply, such as those using the TMS7000 microprocessor. It features a built-in delay timer and hysteresis to provide stable reset signals.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reset Threshold Voltage | 4.5 to 4.6 | V |
| Supply Voltage Range | 3.6 to 18 | V |
| Supply Current | 1.8 to 3.5 | mA |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | SOIC (8-pin) | |
| Package Dimensions | 4.90 mm x 3.91 mm | |
| Low-level Output Voltage (RESET) | 0.4 V at IOL = 16 mA | |
| High-level Output Current (RESET) | 50 µA at VO = 18 V | |
| Low-level Output Current (RESET) | -50 µA at VO = 0 V | |
| Hysteresis (SENS) | 15 mV |
Key Features
- Reset Functionality: The TL7705ACDRE4 provides active high and active low reset outputs to ensure proper system reset during power-up and power-down sequences.
- Supply Voltage Monitoring: It monitors the supply voltage and activates the reset outputs if an undervoltage condition occurs.
- Delay Timer: Includes a built-in delay timer to ensure stable reset signals after the supply voltage exceeds the positive-going threshold value.
- Hysteresis: Features hysteresis to prevent oscillations and ensure stable operation.
- Low Supply Current: Operates with a low supply current, making it energy-efficient.
- RoHS Compliant: The device is RoHS compliant, making it suitable for use in environmentally friendly designs.
Applications
- TTL-Systems and Microcomputers: Ideal for systems requiring a 5-volt supply, such as those using the TMS7000 microprocessor.
- Embedded Systems: Suitable for use in various embedded systems where reliable power-up and power-down reset signals are crucial.
- Industrial Control Systems: Can be used in industrial control systems to ensure that the system operates within specified voltage ranges.
- Analog and Digital Circuits: Applicable in both analog and digital circuits where supply voltage monitoring is essential.
Q & A
- What is the primary function of the TL7705ACDRE4?
The primary function of the TL7705ACDRE4 is to monitor the supply voltage and provide reset signals to ensure proper system operation during power-up and power-down sequences.
- What is the reset threshold voltage for the TL7705ACDRE4?
The reset threshold voltage for the TL7705ACDRE4 is between 4.5 V and 4.6 V.
- What type of package is the TL7705ACDRE4 available in?
The TL7705ACDRE4 is available in an 8-pin SOIC package.
- What is the operating temperature range for the TL7705ACDRE4?
The operating temperature range for the TL7705ACDRE4 is -40°C to 85°C.
- Does the TL7705ACDRE4 have built-in hysteresis?
Yes, the TL7705ACDRE4 features built-in hysteresis to prevent oscillations and ensure stable operation.
- What is the typical supply current for the TL7705ACDRE4?
The typical supply current for the TL7705ACDRE4 is between 1.8 mA and 3.5 mA.
- Is the TL7705ACDRE4 RoHS compliant?
Yes, the TL7705ACDRE4 is RoHS compliant.
- What is the purpose of the delay timer in the TL7705ACDRE4?
The delay timer ensures that the reset outputs remain active for a specified time after the supply voltage exceeds the positive-going threshold value, providing stable reset signals.
- How does the TL7705ACDRE4 handle undervoltage conditions?
During an undervoltage condition, the TL7705ACDRE4 activates the reset outputs to prevent the system from operating under unsafe voltage levels.
- What is the recommended external capacitor value for the REF pin?
A typical external capacitor value of 0.1 μF is recommended for the REF pin to reduce the influence of fast transients in the supply voltage.
