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.