1 Features

• Factory programmed or user-programmable

watchdog timeout

– ±10% Accurate timer (maximum)

– Factory programmed: 1 msec to 100 sec

• Factory programmed or user-programmable reset

delay

– ±10% Accurate timer (maximum)

– Factory programmed option: 2 msec to 10 sec

• Input voltage range: VDD = 1.04 V to 6.0 V

• Fixed threshold voltage (VIT-): 1.05 V to 5.4 V

– Threshold voltage available in 50 mV steps

– 1.2% Voltage threshold accuracy (maximum)

– Built-in hysteresis (VHYS): 5% (typical)

• Ultra low supply current: IDD = 250 nA (typical)

• Open-drain, push-pull; active-low outputs

• Various programmability options:

– Watchdog enable-disable

– Watchdog startup delay: no delay to 10 sec

– On the fly timer extension: 1X to 256X

– Latched output option

• MR functionality support

2 Applications

• Robot servo drive

• Mixed module (AI, AO, DI, DO)

• HVAC controller

• Electricity meter

• Infusion pump

• Surgical equipment

3 Description

The TPS35 is an ultra-low power consumption

(250 nA typical) device offering a precision voltage

supervisor with a programmable timeout watchdog

timer. The TPS35 supports wide threshold levels for

undervoltage supervision with 1.2% accuracy across

the specified temperature range.

The TPS35 offers a high accuracy timeout watchdog

timer with a host of features for a wide variety of

applications. The timeout watchdog timer can be

factory programmed or user programmed using an

external capacitor. The timer value can be changed

on-the-fly using a combination of logic pins. The

watchdog also offers unique features such as enabledisable,

start-up delay, independent WDO pin option.

The RESET or WDO delay can be set by factoryprogrammed

default delay settings or programmed by

an external capacitor. The device also offers a latched

output operation where the output is latched until the

supervisor or watchdog fault is cleared.

The TPS35 provides a performance upgrade

alternative to TPS3851 device family. The TPS35 is

available in a small 6-pin WSON and 8-pin SOT-23

package.