Overview
The TL7705BIDR, produced by Texas Instruments, is an integrated-circuit supply-voltage supervisor designed for use as a reset controller in microcomputer and microprocessor systems. This component is specifically tailored for 5-V systems and features a programmable delay time, making it versatile for various applications. The TL7705BIDR monitors the supply voltage for undervoltage conditions and generates reset signals accordingly, ensuring system stability and reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 3.6 to 18 | V |
| Reference Voltage (REF) | 2.48 to 2.58 | V |
| Negative-Going Input Threshold Voltage at SENSE Input | 4.45 to 4.65 | V |
| Hysteresis, SENSE (VIT+ – VIT–) | 30 | mV |
| Power-Up Reset Voltage | 1 | V |
| High-Level Output Voltage, RESET | VCC - 1.5 | V |
| Low-Level Output Voltage, RESET | 0.4 | V |
| Propagation Delay Time from Low-Level to High-Level Output | 270 to 500 | ns |
| Effective Pulse Duration | 150 | ns |
Key Features
- Power-On Reset Generator: Generates a reset signal during power-up when the supply voltage reaches a certain threshold.
- Automatic Reset Generation After Voltage Drop: Automatically generates a reset signal if the supply voltage drops below the threshold voltage.
- RESET Output Defined From VCC ≥ 1 V: Ensures the reset output is active only when the supply voltage is above 1 V.
- Precision Voltage Sensor: Monitors the supply voltage with high precision.
- Temperature-Compensated Voltage Reference: Provides a stable reference voltage across a range of temperatures.
- True and Complement Reset Outputs: Offers both active high and active low reset outputs.
- Externally Adjustable Pulse Duration: Allows the pulse duration of the reset signal to be adjusted using external components.
Applications
- Wireless Communication Systems: Used in wireless devices to ensure stable operation under varying voltage conditions.
- Factory Automation: Employed in industrial automation systems to monitor and control supply voltages.
- Building Automation: Utilized in building control systems for reliable voltage monitoring.
- Servers: Used in server systems to prevent data loss and system crashes due to voltage drops.
- Notebooks and Desktop Computers: Implemented in personal computers to ensure stable operation and prevent data loss.
- Set-Top Boxes (STB) and Digital Video Recorders (DVR): Used in consumer electronics to maintain system reliability.
Q & A
- What is the primary function of the TL7705BIDR?
The primary function of the TL7705BIDR is to monitor the supply voltage and generate reset signals in case of undervoltage conditions, ensuring system stability and reliability.
- What is the operating temperature range of the TL7705BIDR?
The TL7705BIDR operates within a temperature range of -40°C to 85°C.
- What is the supply voltage range for the TL7705BIDR?
The TL7705BIDR can operate with a supply voltage ranging from 3.6 V to 18 V.
- How is the pulse duration of the reset signal adjusted?
The pulse duration of the reset signal can be adjusted using an external timing capacitor connected to the CT pin.
- What types of reset outputs does the TL7705BIDR provide?
The TL7705BIDR provides both active high and active low reset outputs.
- What is the purpose of the reference voltage output (REF) in the TL7705BIDR?
The reference voltage output (REF) provides a stable voltage reference for the system, which is temperature-compensated.
- How does the TL7705BIDR handle power-up reset conditions?
During power-up, the TL7705BIDR generates a reset signal when the supply voltage reaches a value approaching 1 V, ensuring a stable system startup.
- What are some common applications of the TL7705BIDR?
The TL7705BIDR is commonly used in wireless communication systems, factory automation, building automation, servers, notebooks, desktop computers, set-top boxes, and digital video recorders.
- What external components are required for the TL7705BIDR to function properly?
External components required include a decoupling capacitor for the REF pin, a timing capacitor for the CT pin, and pullup resistors for the RESET and RESET pins.
- How do you ensure the correct HIGH level for the microcontroller RESET pin in a TL7705BIDR circuit?
A pullup resistor is required to ensure the correct HIGH level for the microcontroller RESET pin, as the RESET output is open collector.
