Overview
The TL7705AID is a 5-V single-supply voltage supervisor integrated circuit designed by Texas Instruments. It is part of the TL77xxA family, which is specifically tailored for use as reset controllers in microcomputer and microprocessor systems. The device monitors the supply voltage for undervoltage conditions and generates a reset signal when the voltage drops below a predefined threshold. This component is crucial for ensuring proper system initialization and preventing data corruption during power-up or power-down sequences.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package Type | SOIC (D) - 8 pins |
| Operating Temperature Range | -40°C to 85°C |
| Threshold Voltage (Typical) | 4.55 V |
| Supply Voltage Range | 3.5 V to 18 V |
| Time Delay | Programmable (td = 1.3 × 10^4 × CT, where CT is in farads) |
| 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 |
| Supply Current | 1.8 mA to 3 mA (all inputs and outputs open) |
Key Features
- Power-On Reset Generator: Generates a reset signal during power-up when the supply voltage reaches a predefined threshold.
- Automatic Reset Generation After Voltage Drop: Activates the reset outputs when an undervoltage condition occurs during normal operation.
- Wide Supply-Voltage Range: Operates over a supply voltage range of 3.5 V to 18 V.
- Precision Voltage Sensor: Monitors the supply voltage with high precision.
- Temperature-Compensated Voltage Reference: Provides a stable reference voltage that is less affected by temperature changes.
- Externally Adjustable Pulse Duration: Allows the time delay to be adjusted using an external capacitor.
Applications
The TL7705AID is particularly useful in microcomputer and microprocessor systems that require a 5-volt supply, such as TTL systems and various microcomputer architectures. It is also applicable in systems where precise voltage monitoring and reset generation are critical, including:
- Microcomputer systems
- Microprocessor systems
- Embedded systems
- Industrial control systems
- Automotive electronics
Q & A
- What is the primary function of the TL7705AID?
The primary function of the TL7705AID is to monitor the supply voltage and generate a reset signal when the voltage drops below a predefined threshold or during power-up sequences.
- What is the typical threshold voltage for the TL7705AID?
The typical threshold voltage for the TL7705AID is 4.55 V.
- What is the operating temperature range of the TL7705AID?
The operating temperature range of the TL7705AID is -40°C to 85°C.
- How is the time delay for the reset signal adjusted?
The time delay for the reset signal is adjusted using an external capacitor (CT), with the delay time calculated as td = 1.3 × 10^4 × CT.
- What is the supply voltage range for the TL7705AID?
The supply voltage range for the TL7705AID is 3.5 V to 18 V.
- What type of package does the TL7705AID come in?
The TL7705AID comes in an SOIC (D) package with 8 pins.
- What are some common applications of the TL7705AID?
The TL7705AID is commonly used in microcomputer and microprocessor systems, embedded systems, industrial control systems, and automotive electronics.
- How does the TL7705AID handle power-up and power-down sequences?
During power-up, the TL7705AID generates a reset signal when the supply voltage reaches a predefined threshold. During power-down, the reset outputs remain active until the supply voltage falls below 2 V.
- What is the purpose of the temperature-compensated voltage reference in the TL7705AID?
The temperature-compensated voltage reference provides a stable voltage source that is less affected by temperature changes, ensuring consistent operation across various environmental conditions.
- Can the TL7705AID be used in systems with different supply voltages?
Yes, the TL7705AID can be used in systems with different supply voltages, but it is specifically designed for systems requiring a 5-volt supply.
