Overview
The CAT872-30ULGT3 is a dual input reset generator produced by onsemi, designed to restart microprocessor and microcontroller-based systems when the watchdog timer or other resetting mechanisms have failed. This device monitors two inputs and outputs an active-low reset pulse after both inputs have been active (logic low) for a factory preset minimum time. The CAT872-30ULGT3 is part of the CAT872 series, which offers various delay times and reset pulse widths, making it versatile for different system requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range (VDD) | 1.65 to 5.5 | V |
| Input Voltage Range (VIN) | -0.3 to 6 or (VDD + 0.3), whichever is lower | V |
| Maximum Junction Temperature (TJ(max)) | 150 | °C |
| Output Current (IOUT) | 0 to 3 | mA |
| Ambient Temperature (TA) | -40 to 85 | °C |
| Reset Pulse Width (tR) | 57 to 83 | ms |
| Delay Time (tLOW_DELAY) | 2.46 to 3.54 | s (for CAT872-30) |
| Quiescent Current (IDD) | 10 | nA (typical) |
| Package Type | ULLGA-6 | |
| Package Dimensions | 1.45 x 1.0 x 0.4 mm |
Key Features
- Operates on 1.65 V to 5.5 V power supplies.
- Ultra-low quiescent current: 10 nA (typical).
- Schmitt Trigger inputs for noise immunity.
- Eight factory preset delay times from 0.5 s to 5 s.
- Small ULLGA-6 package: 1.45 x 1.0 x 0.4 mm.
- Pb-free, halogen-free/BFR-free, and RoHS compliant.
- Active-low open drain output capable of sinking up to 3 mA of current.
- Internal 200 kΩ pull-up resistor on MR2 input.
Applications
- Mobile phones.
- PDAs.
- MP3 players.
- Personal navigation devices.
- Systems requiring manual reset capabilities for microprocessors and microcontrollers.
- Systems with dual power supply voltages.
- Applications requiring low power consumption and small form factor.
Q & A
- What is the purpose of the CAT872-30ULGT3?
The CAT872-30ULGT3 is designed to restart microprocessor and microcontroller-based systems when the watchdog timer or other resetting mechanisms have failed. - What is the input voltage range for the CAT872-30ULGT3?
The input voltage range is from 1.65 V to 5.5 V. - How long is the reset pulse width for the CAT872-30ULGT3?
The reset pulse width is typically between 57 ms and 83 ms. - What are the delay times available for the CAT872 series?
The CAT872 series offers eight factory preset delay times ranging from 0.5 s to 5 s. - Is the CAT872-30ULGT3 RoHS compliant?
Yes, the CAT872-30ULGT3 is Pb-free, halogen-free/BFR-free, and RoHS compliant. - What is the quiescent current of the CAT872-30ULGT3?
The quiescent current is typically 10 nA. - Can the CAT872-30ULGT3 be used in systems with dual power supply voltages?
Yes, it can be used in systems where the supply VDD is different from the MR1 and MR2 input logic. - How does the test mode function in the CAT872-30ULGT3?
The test mode allows the delay timer to clock at an accelerated rate. It is initiated by setting MR1 to 0 V and applying a fast external clock on MR2. - What is the package type and dimensions of the CAT872-30ULGT3?
The package type is ULLGA-6, with dimensions of 1.45 x 1.0 x 0.4 mm. - Can the reset output be wire-OR’d with other open drain devices?
Yes, the active-low open drain output can be wire-OR’d with other open drain reset devices.
