Texas Instruments TLV809K33DBVT

Overview

TLV809K33DBVT from Texas Instruments is a 3-pin push-pull supply voltage supervisor IC designed for undervoltage monitoring of 3.3-V systems. It features a fixed 2.93-V detection threshold (V_IT–), 200-ms reset delay, 9-µA typical supply current, and operates across –40°C to +85°C. It is used in DSP/FPGA power sequencing and microcontroller reset assertion during brownout conditions.

For engineers reviewing the TLV809K33DBVT datasheet, TLV809K33DBVT pinout, TLV809K33DBVT application, or TLV809K33DBVT equivalent, key selection criteria include precise 2.93-V threshold tolerance (±60 mV), push-pull RESET output drive capability (4 mA sink), SOT-23 (DBV) package compatibility, and immunity to fast VDD transients ≥10 µs duration.

Technical Context

The TLV809K33DBVT integrates an internal 1.137-V reference, comparator, oscillator-based timer, and push-pull output stage. Its detection circuitry asserts RESET low when VDD falls below 2.93 V and holds it active for ≥120 ms after VDD rises above threshold - ensuring reliable system initialization.

It requires no external components beyond a 0.1-µF VDD bypass capacitor and supports operation from 2 V to 6 V supply. The device enters high-impedance state below 1.1 V VDD and exhibits built-in transient rejection for pulses ≥10 µs at VDD.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 3-pin surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV809K33DBVT, TLV809K33DBVR provides identical performance in a larger reel format for manufacturing efficiency, while MAX809TRD33+T requires external biasing and delivers less precise timing - making TLV809K33DBVT the preferred choice for new designs demanding push-pull reliability and tight threshold control.

Availability

TLV809K33DBVT is available at Aetrix Electronics and suitable for factory automation, portable equipment, and set-top box designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for TLV809K33DBVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision voltage monitoring and supervisory ICs.

The TLV809 family was engineered specifically for cost-sensitive, space-constrained applications needing reliable power-on reset and brownout protection in DSP, FPGA, and microcontroller systems - emphasizing low quiescent current, fixed thresholds, and minimal external components.

FAQ

What is the exact reset threshold voltage of the TLV809K33DBVT?

The TLV809K33DBVT has a nominal negative-going input threshold voltage (V_IT–) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V over –40°C to +85°C. This value is factory-trimmed and fixed - not adjustable - and corresponds to approximately 13.6% below the nominal 3.3-V supply, ensuring early detection of brownout conditions before system instability occurs. The TLV809K33DBVT maintains this accuracy without external calibration.

Does the TLV809K33DBVT require an external pull-up resistor on the RESET pin?

No, the TLV809K33DBVT features a push-pull RESET output stage capable of actively driving both high and low logic states. It can source up to 500 µA and sink up to 4 mA, eliminating the need for an external pull-up resistor. This simplifies PCB layout, reduces BOM count, and improves noise immunity compared to open-drain alternatives like the MAX809. The TLV809K33DBVT's VOH exceeds VDD – 0.4 V at 2 mA, ensuring solid CMOS-high compatibility.

What is the minimum VDD voltage required for the TLV809K33DBVT to assert a valid RESET signal?

The TLV809K33DBVT begins asserting a valid RESET signal when VDD rises above 1.1 V. Below this voltage, the internal circuitry is inactive and the RESET pin enters high-impedance state - allowing external pull-up networks to define its level. Once VDD exceeds 1.1 V, the device monitors for threshold crossing and applies the 200-ms delay before deassertion. This behavior is explicitly defined in the TLV809K33DBVT datasheet Section 7.5 and Figure 7-1.

Can the TLV809K33DBVT be used to monitor supplies other than 3.3 V?

Yes - while the TLV809K33DBVT is optimized for 3.3-V systems with its 2.93-V threshold, it operates across a 2-V to 6-V VDD range and can supervise any supply within that window, provided the threshold aligns with the target undervoltage condition. For example, it may monitor a 5-V rail where a 2.93-V fault indicates catastrophic failure, or serve as secondary supervision in multi-rail systems. Its TLV809K33DBVT specification does not restrict usage to 3.3-V-only applications.

How does the TLV809K33DBVT handle fast voltage transients on the VDD pin?

The TLV809K33DBVT incorporates built-in transient rejection: it ignores VDD glitches shorter than 10 µs (minimum pulse width t_w), regardless of amplitude, per Section 7.6 of its datasheet. This prevents spurious resets caused by switching noise, ESD coupling, or load-step artifacts. Transients meeting or exceeding 10 µs duration - especially those dipping below V_IT– - will trigger reset assertion. This behavior is intrinsic to the TLV809K33DBVT's internal timing architecture and requires no external filtering.