TPS3813J25, TPS3813L30 TPS3813K33, TPS3813I50

PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG

FEATURES

• Window-Watchdog With Programmable Delay and Window Ratio

• 6-Pin SOT-23 Package

• Supply Current of 9 µA (Typ)

• Power On Reset Generator With a Fixed Delay Time of 25 ms

• Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, 5 V

• Open-Drain Reset Output

• Temperature Range –40°C to 85°C

APPLICATIONS

• Applications Using DSPs, Microcontrollers, or Microprocessors

• Safety Critical Systems

• Automotive Systems

• Healing Systems

DESCRIPTION

The TPS3813 family of supervisory circuits provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems.

During power on, RESET is asserted when supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, t d = 25 ms typical, starts after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider.

For safety critical applications the TPS3813 family incorporates a so-called window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting WDT to GND, VDD, or using an external capacitor. The lower limit and thus the window ratio is set by connecting WDR to GND or VDD. The supervised processor now needs to trigger the TPS3813 within this window not to assert a RESET.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 6-pin SOT-23 package.

The TPS3813 devices are characterized for operation over a temperature range of –40°C to 85°C.

TYPICAL OPERATING CIRCUIT

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range (unless otherwise noted) ⁽¹⁾

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltage values are with respect to GND. For reliable operation the device should not be operated at 7 V for more than t = 1000h continuously.

Stock Offer (Hot Sell)

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