TLC7705 Micropower Supply Voltage Monitor

Overview

The TLC7705 is part of the TLC77xx family of micropower supply voltage monitors designed to provide reliable power-on reset signals for microprocessors (µPs), microcontrollers (µCs), and other digital systems. This device ensures proper system initialization by monitoring the supply voltage and generating a reset signal when the voltage falls below a predefined threshold. The TLC7705 is optimized for low-power applications, making it ideal for battery-operated and portable electronics.

With its precision voltage monitoring and ultra-low quiescent current, the TLC7705 is well-suited for critical applications where power efficiency and reliability are paramount. The device operates over a wide voltage range and includes adjustable hysteresis to prevent erratic reset behavior during noisy or unstable power conditions.

Features

• Ultra-Low Power Consumption: Quiescent current as low as 5 µA (typical), making it ideal for battery-powered applications.
• Precision Voltage Monitoring: Accurate threshold detection with ±1.5% tolerance over temperature.
• Adjustable Hysteresis: External resistor allows customization of hysteresis to prevent false resets.
• Wide Operating Voltage Range: Operates from 1.8 V to 6.0 V, supporting a variety of digital systems.
• Manual Reset Input: Includes an active-low manual reset pin for forced system initialization.
• Power-On Reset Delay: Built-in delay ensures stable voltage before releasing reset.
• Temperature Stability: Performance remains consistent across industrial temperature ranges (-40°C to +85°C).
• Small Footprint: Available in compact packages (SOT-23, SOIC) for space-constrained designs.

Applications

The TLC7705 is widely used in systems requiring reliable power monitoring and reset functionality. Key applications include:

• Microprocessor and Microcontroller Systems: Ensures proper boot-up and recovery during power fluctuations.
• Battery-Powered Devices: Portable electronics, medical devices, and IoT sensors benefit from its low power consumption.
• Embedded Systems: Industrial controllers, automotive electronics, and consumer appliances.
• Data Loggers and Memory Backup Systems: Prevents data corruption during power loss.
• Automotive Electronics: Supports stable operation in harsh environments.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.3 V to 7 V
• Input Voltage (Manual Reset Pin): -0.3 V to V_CC + 0.3 V
• Output Voltage (Reset Pin): -0.3 V to V_CC + 0.3 V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 1.8 V to 6.0 V
• Threshold Voltage (V_TH): Factory-set or adjustable via external resistors
• Hysteresis (V_HYS): Adjustable via external resistor (typical range: 20 mV to 200 mV)
• Quiescent Current (I_Q): 5 µA (typical) at 3.3 V

Performance Specifications

• Reset Threshold Accuracy: ±1.5% over temperature
• Reset Timeout Period: Adjustable via external capacitor (default: 200 ms typical)
• Output Drive Capability: 5 mA (sink/source)
• Propagation Delay: 1 µs (typical) for manual reset

Package Information

The TLC7705 is available in multiple package options to accommodate different design requirements:

• SOT-23-5: Small-outline transistor package (2.9 mm x 1.6 mm) for space-constrained applications.
• SOIC-8: Standard small-outline integrated circuit package (4.9 mm x 3.9 mm) for ease of prototyping.

Pin Configuration

• Pin 1 (MR): Manual reset input (active low).
• Pin 2 (GND): Ground reference.
• Pin 3 (RESET): Reset output (active low).
• Pin 4 (V_CC): Supply voltage input.
• Pin 5 (HYST): Hysteresis adjustment (connect resistor to GND).

Conclusion

The TLC7705 is a versatile and reliable voltage monitor designed for low-power digital systems. Its precision monitoring, ultra-low quiescent current, and flexible configuration options make it an excellent choice for applications requiring robust power management. Whether used in portable electronics, industrial controls, or automotive systems, the TLC7705 ensures stable operation and prevents data corruption during power anomalies.