CAT1641LI-45-G

The CAT1641LI-45-G, is an integrated circuit (IC) specifically produced by ON Semiconductor Corporation. It is part of the microprocessor supervisory products line and is categorized as a power management integrated circuit (PMIC) supervisor. It is used in general purpose reset/watchdog timer applications requiring microprocessor reset/watchdog functions and a precision power-on reset device for microprocessors, DSPs, FPGAs and ASICs.

The CAT1641LI-45-G uses industry leading, low quiescent current, precision reset/watchdog control circuit to manage microprocessor resets/watchdog timers and generate system reset signals for a variety of processor/DSP systems. It is designed to safely detect and react to system faults and preserve valid application data from corrupting memories. The CAT1641LI-45-G utilizes an advanced watchdog timer system (WDT) to generate an output that reports the status of certain activities within the system. It also includes a selectable 0.1, 10 or 100 millisecond timer that operates independently of the main reset/watchdog timer function.

The CAT1641LI-45-G is a power-on reset generator that provides a reset signal upon power-up, and it can be used to ensure proper initialization of a wide range of microprocessor/DSP systems. It includes a low quiescent current, precision voltage monitor and reset generator circuit with a wide range of reset threshold voltages and hysteresis levels dependent on device selection. An integrated LP140 Schmitt Trigger is used to shape the reset output signal and reduce the effect of background noise. Internal pull-up or pull-down circuitry can be used to configure the reset output for either active high or active low systems.

The CAT1641LI-45-G is a small size chip and packages with standard pin spacing are available to reduce board space. It features an open drain N-type MOSFET switch, which consists of a single P-type total power MOSFET and its associated circuitry. This combination allows the chip to operate with a low current draw when it is turned on, meaning that it increases system efficiency as well as reducing power consumption. The device is available in a 5-pin SOT-323 and 5-pinTSOT-23 packages.

The CAT1641LI-45-G utilizes an advanced built-in delay circuit and an external time-delay selector for the reset pulse length. The delay time is selected by a resistor network to provide a wide selection of reset delay times from 0.5 to 300 mS. The CAT1641LI-45-G also provides protection against false or sudden power ramp-up. It includes an active supply voltage monitoring with adjustable reset thresholds and hysteresis levels. The reset output is generated when the monitored supply voltage falls BELOW the preset threshold, typically clamping the reset output to a low level until the voltage rises ABOVE the reset threshold.

In addition to providing reset and watchdog timer functions, the CAT1641LI-45-G also includes selectable interrupt and battery back-up features. The on-chip circuitry provides the user with the option of the microprocessor detecting system events using an on-chip bus interrupt indicator. The chip also provides an input for connection of a battery or supercap back-up, allowing for system recovery after a power interruption.

The CAT1641LI-45-G is well suited for battery-powered systems, offering superior performance combined with a low quiescent current, making it an ideal choice for applications requiring reliable reset/watchdog functions and low-power operation. The device allows for a clean shutdown and is easily incorporated into a wide range of system designs.

The CAT1641LI-45-G is designed to be linked to a low power processor applications such as DSP, FPGA and ASIC systems. The ability to select and monitor multiple system supply voltages, minimize downtime in the event of power failure, is a key feature of the CAT1641LI-45-G identity it as an ideal PMIC supervisor.