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TPS3809K33DBVR

3.3V fixed voltage supervisor, 3.07V threshold, 1.5% accuracy, 200ms timeout, SOT-23-5

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Manufacturer Part：

TPS3809K33DBVR

Package：

SOT-23-5 (2.9 x 1.6 x 1.3 mm)

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Description

Product Overview

The TPS3809K33DBVR from Texas Instruments is a 3.3V fixed-threshold voltage supervisor with 200ms reset timeout in SOT-23-5. It provides precision monitoring with 1.5% threshold accuracy and 15uA supply current for MCU power-on reset.

Key Specifications

Function Fixed-Voltage Supervisor (Reset IC)
Threshold Voltage 3.07V (fixed, -1.5%/+1.5%)
Threshold Accuracy 1.5% (over temperature)
Reset Timeout 200ms (typ)
Supply Voltage 2.0V to 6.5V
Supply Current 15uA (typ)
Output Type Active-Low, Open-Drain
Reset Output Active low when VDD below threshold
MR Pin No (manual reset not available on K33)
Package SOT-23-5
Operating Temperature -40 to +125 C

Features

  • Precision 1.5% threshold accuracy over temperature
  • Factory-programmed 3.07V threshold for 3.3V rail monitoring
  • 200ms fixed reset timeout period
  • Ultra-low 15uA supply current
  • Open-drain active-low RESET output
  • Immune to short VDD transients (built-in filter)

Applications

  • 3.3V microcontroller power-on reset
  • FPGA/DSP reset generation
  • System voltage monitoring
  • Battery-powered equipment supervision

The TPS3809K33DBVR from Texas Instruments is a micro-power voltage supervisor (reset IC) specifically designed for monitoring 3.3V power rails in microcontroller, DSP, and FPGA applications. The device features a factory-programmed threshold voltage of 3.07V with +/-1.5% accuracy over the full -40 to +125C temperature range, providing reliable detection of brownout conditions on 3.3V supplies. When the supply voltage drops below the threshold, the open-drain RESET output asserts low, holding the system in reset. When the supply rises above the threshold plus hysteresis, an internal timer starts and holds RESET low for a fixed 200ms timeout period before releasing it high. This ensures the system has adequate time to stabilize before operation begins. The ultra-low supply current of 15uA typical makes the TPS3809 suitable for battery-powered applications where power consumption must be minimized. The open-drain output architecture allows the RESET line to be wire-ORed with other reset sources or connected to systems with different supply voltages. Built-in glitch immunity filters out short VDD transients that could cause false reset assertions. The TPS3809 is available in a compact SOT-23-5 package, making it ideal for space-constrained board designs. The K33 variant specifies a fixed 3.07V threshold for 3.3V rail monitoring; other variants provide thresholds from 1.2V to 5.0V.

The TPS3809K33DBVR operates as a precision voltage supervisor with fixed threshold and timeout. Key subsystems include: (1) Voltage Monitor – a precision bandgap reference and resistor divider set the threshold voltage to 3.07V; when VDD falls below this threshold, the comparator output changes state, asserting RESET low; a built-in hysteresis of approximately 30mV prevents chattering near the threshold; (2) Glitch Filter – an internal filter rejects short-duration VDD transients that fall below threshold for less than the filter time constant; this prevents false resets from supply noise spikes; (3) Reset Generator – when VDD is below threshold, the RESET output is actively pulled low (open-drain MOSFET on); when VDD rises above threshold, the reset generator starts the timeout counter; (4) Timeout Counter – an internal oscillator and counter generate a fixed 200ms delay from VDD crossing above threshold to RESET releasing high; this gives the monitored system time for oscillators to start and power rails to stabilize; the timeout is generated internally without external components; (5) Output Stage – an open-drain N-channel MOSFET pulls RESET low when asserted; an external pull-up resistor (typically 10k-100k) to the system logic supply sets the high-level voltage; this allows RESET to interface with logic at a different supply voltage than VDD.

Pin Name Function
1 RESET Active-low reset output (open-drain, requires external pull-up)
2 GND Ground
3 CT/MR Not connected (no manual reset or adjustable timeout on K33)
4 NC No connect
5 VDD Supply voltage and sense input (2.0V to 6.5V)
  • 3.3V MCU power-on reset: holds MCU in reset until 3.3V rail is stable for 200ms
  • Brownout detection: asserts reset when 3.3V rail drops below 3.07V during supply transients
  • FPGA configuration reset: holds FPGA in reset during power-up for clean configuration startup
  • Multi-voltage system: monitors 3.3V rail while RESET output pulled up to 1.8V logic supply
Manufacturer Part Number Package Notes
TI TPS3809J25DBVR SOT-23-5 2.25V threshold (2.5V rail)
TI TPS3823-33DBVR SOT-23-5 Similar with manual reset input
onsemi NCP303LSN30T1G TSOP-5 3.0V threshold, similar function
Maxim/ADI MAX809TR30+T SOT-23-3 3.0V threshold, 3-pin version
Microchip TCM809MENB713 SOT-23-3 3.08V threshold, low IQ
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