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
• 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 TPS3435 is an ultra-low power consumption (250
nA typical) device offering a programmable timeout
watchdog timer.
The TPS3435 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 feature can be enabled or
disabled using a dedicated pin or combination of timer
extension pins. The device also offers start-up delay
options to disable watchdog monitoring for fixed time
immediately after host power up.
The WDO delay can be set by factory-programmed
default delay settings or programmed by an external
capacitor. The device also offers a latched output
operation where the output is latched until the
watchdog fault is cleared.
The TPS3435 provide performance upgrade
alternative to TPS3431 device family. The TPS3435
is available in a small 6-pin WSON and 8-pin SOT23
package.