1 Features
1• Wide operating voltage: 1.5 V to 10 V
• Nano supply current: 300 nA (Typ), 700 nA (Max)
• Fixed threshold voltage (VIT-)
– Threshold from 1.6 V to 4.9 V in 0.1-V steps
– High accuracy: 1% (Typ), 1.5% (Max)
– Built-in hysteresis (VIT+)
– 1.6 V < VIT- ≤ 3.0 V = 100 mV (Typical)
– 3.1 V ≤ VIT- < 4.9 V = 200 mV (Typical)
• Start-up delay (tSTRT): 220 μs (Typ), 350 μs (Max)
• Programmable reset time delay (tD):
– 50 μs (no capacitor) to 6.2 s (10-μF)
• Active-low manual reset (MR)
• Three output topologies:
– TPS3840DL: open-drain, active-low (RESET),
requires pull-up resistor
– TPS3840PL: push-pull, active-low (RESET)
– TPS3840PH: push-pull, active-high (RESET)
• Wide temperature range: –40°C to +125°C
• Package: SOT23-5 (DBV)

2 Applications
• Grid infrastructure: circuit breaker, smart meter,
other monitoring and protection equipment
• Factory automation: field transmitter, PLC.
• Building automation: fire safety, smoke detector,
and HVAC
• Electronic point of sale
• Portable, battery-powered systems

3 Description
Wide Vin allows monitoring 9V rails or batteries
without external components and 24V rails with
external resistors. Nano-Iq extends battery life for low
power applications and minimizes current
consumption when using external resistors. Fast
start-up delay allows the detection of a voltage fault
before the rest of the system powers up providing
maximum safety in hazardous start-up fault
conditions. Low Power-on-Reset (VPOR) prevents
false resets, premature enable or turn-on of next
device, and proper transistor control during power-up
and power-down.
Reset output signal is asserted when the voltage at
VDD drops below the negative voltage threshold (VIT-)
or when manual reset (MR) is pulled to a low logic
(VMR_L). Reset signal is cleared when VDD rise above
VIT- plus hysteresis (VIT+) and manual reset is floating
or above VMR_H and the reset time delay (tD) expires.
Reset time delay can be programmed by connecting
a capacitor between CT pin and ground. For a fast
reset CT pin can be left floating.
Additional features: Built-in glitch immunity protection
for MR and VDD, built-in hysteresis, low open-drain
output leakage current (ILKG(OD)).