Overview
The CAT823TTDI-GT3, produced by onsemi, is a system supervisory voltage reset IC designed to provide essential reset and monitoring functions for electronic systems. This device is part of the CAT823 series, which includes various voltage trip points to cater to different system requirements. The CAT823TTDI-GT3 specifically monitors system voltage and issues a reset signal when the voltage drops below a specified threshold, ensuring proper system operation during power-up, power-down, and brownout conditions.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 1.2 | 5.5 | V | ||
| Reset Threshold (VRST) | −40°C ≤ TA ≤ +85°C | 3.00 | 3.08 | 3.15 | V |
| Reset Active Timeout Period (tRP) | 140 | 400 | ms | ||
| Watchdog Timeout Period (tWD) | 1.12 | 3.20 | s | ||
| Operating Ambient Temperature | −40 | +85 | °C | ||
| Storage Temperature | −65 | +150 | °C | ||
| Package | TSOT-23 5-lead |
Key Features
- Automatically restarts microprocessor after power failure
- Monitors pushbutton for external override
- Accurate under-voltage system monitoring
- Brownout detection system reset for use with 3.0, 3.3, and 5.0 V systems
- Pin and function compatible with the MAX823/24 products
- Operating range from −40°C to +85°C
- Available in TSOT-23 5-lead package
- Pb-free, halogen-free/BFR-free, and RoHS compliant
- Manual reset input for alternative control of reset outputs
- Watchdog input to monitor system signal and issue reset if signal fails to change state
Applications
- Microprocessor and microcontroller-based systems
- Intelligent instruments
- Control systems
- Critical power monitors
- Portable equipment
Q & A
- What is the primary function of the CAT823TTDI-GT3?
The primary function is to monitor system voltage and issue a reset signal when the voltage drops below a specified threshold. - What is the reset threshold voltage for the CAT823TTDI-GT3?
The reset threshold voltage is between 3.00 V and 3.15 V. - What is the purpose of the watchdog timer in the CAT823TTDI-GT3?
The watchdog timer monitors a system signal and issues a reset if the signal fails to change state within a specified timeout period. - How does the manual reset input work on the CAT823TTDI-GT3?
The manual reset input can be pulled low to initiate a reset, and it is internally pulled up by a 52 kΩ resistor. - What is the operating temperature range of the CAT823TTDI-GT3?
The operating temperature range is from −40°C to +85°C. - Is the CAT823TTDI-GT3 RoHS compliant?
Yes, the device is Pb-free, halogen-free/BFR-free, and RoHS compliant. - What package type is the CAT823TTDI-GT3 available in?
The device is available in a TSOT-23 5-lead package. - What are some common applications of the CAT823TTDI-GT3?
Common applications include microprocessor and microcontroller-based systems, intelligent instruments, control systems, critical power monitors, and portable equipment. - How does the CAT823TTDI-GT3 handle power transients?
Short duration negative-going transients of less than 2 μs on the power supply at VRST minimum will not cause a reset condition, but proper bypass capacitance is recommended to mitigate these issues. - Can the watchdog timer be disabled on the CAT823TTDI-GT3?
Yes, the watchdog timer can be disabled by floating or tri-stating the WDI input.
