Product details

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) Adjustable Features Watchdog timer Reset threshold accuracy (%) 2 Output driver type/reset output Active-low, Push-pull Time delay (ms) Programmable Rating Automotive Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 105
Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) Adjustable Features Watchdog timer Reset threshold accuracy (%) 2 Output driver type/reset output Active-low, Push-pull Time delay (ms) Programmable Rating Automotive Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 105
TSSOP (PW) 8 19 mm² 3 x 6.4
  • Qualified for Automotive Applications
  • Fully Programmable Reset Threshold
  • Fully Programmable Reset Period
  • Fully Programmable Watchdog Period
  • 2% Accurate Reset Threshold
  • Input Voltage Down to 2 V
  • Input 18-µA Maximum Input Current
  • Reset Valid Down to 1 V

  • Qualified for Automotive Applications
  • Fully Programmable Reset Threshold
  • Fully Programmable Reset Period
  • Fully Programmable Watchdog Period
  • 2% Accurate Reset Threshold
  • Input Voltage Down to 2 V
  • Input 18-µA Maximum Input Current
  • Reset Valid Down to 1 V

The UCC2946 is designed to provide accurate microprocessor supervision, including reset and watchdog functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both reset threshold and reset period are programmable by the user.

The UCC2946 is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal. These values are shown in. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO is asserted. The watchdog function is disabled during reset conditions.

The UCC2946 is available in 8-pin TSSOP (PW) package to optimize board space.

The UCC2946 is designed to provide accurate microprocessor supervision, including reset and watchdog functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both reset threshold and reset period are programmable by the user.

The UCC2946 is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal. These values are shown in. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO is asserted. The watchdog function is disabled during reset conditions.

The UCC2946 is available in 8-pin TSSOP (PW) package to optimize board space.

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Type Title Date
* Data sheet Microprocessor Supervisor With Watchdog Timer datasheet (Rev. B) 10 Mar 2009
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Selection guide Automotive Supervisor and Reset IC Selection Guide 22 Feb 2016

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