Texas Instruments TLV809ED29DBZR

Overview

TLV809ED29DBZR from Texas Instruments is a low-power voltage supervisor IC with push-pull active-low reset output, 2.93 V threshold voltage (±0.5% typical accuracy), 50 ms fixed reset delay, and 250 nA typical supply current. It monitors VDD in battery-powered microcontroller systems and asserts RESET when supply drops below VIT–, holding it for tD after recovery. Designed for use in portable electronics requiring reliable power-on reset at ultra-low quiescent current.

For engineers reviewing the TLV809ED29DBZR datasheet, TLV809ED29DBZR pinout, TLV809ED29DBZR application, or TLV809ED29DBZR equivalent, key selection criteria include its guaranteed operation down to 0.7 V VPOR, SOT-23-3 (DBZ) package with pin 1 = GND, ±0.5% threshold accuracy over –40°C to +125°C, and immunity to sub-10 µs VDD transients.

Technical Context

The TLV809ED29DBZR implements a precision bandgap-referenced comparator with built-in hysteresis (VHYS ≈ 1.2%) to prevent chatter near VIT–. Its internal timer enforces a fixed 50 ms reset timeout (variant D) after VDD rises above VIT+, independent of external components.

It features integrated glitch immunity (tGI = 10 µs typical) that rejects fast VDD excursions - only sustained dips below VIT– for ≥10 µs trigger reset assertion. The push-pull output drives RESET low without requiring an external pull-up resistor, simplifying PCB layout versus open-drain variants.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, with pin 1 = GND (confirmed per Device Naming Nomenclature and Figure 6-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EC29DBZR and MAX809TRD29+T, TLV809ED29DBZR delivers optimal balance of timing margin (50 ms), ultra-low power (250 nA), and robustness against VDD transients - making it preferred for new designs prioritizing battery life and reliability in noisy environments.

Availability

TLV809ED29DBZR is available at Aetrix Electronics and suitable for electricity meters, portable medical devices, and industrial PLC modules requiring stable component supply with guaranteed long-term availability.

Supply support for TLV809ED29DBZR 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 delivering analog and embedded processing solutions, with broad portfolio coverage in power management, signal chain, and microcontrollers.

The TLV809E series belongs to TI's low-power voltage supervisor product line, engineered specifically for battery-operated and energy-sensitive systems where precision, ultra-low IQ, and small footprint are critical design constraints.

FAQ

What is the exact reset threshold voltage of TLV809ED29DBZR?

The TLV809ED29DBZR has a factory-programmed falling threshold voltage (VIT–) of 2.93 V with ±0.5% typical accuracy over –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The rising threshold (VIT+) equals VIT– plus hysteresis (≈1.2% of VIT–), ensuring stable reset release without oscillation near the trip point. TLV809ED29DBZR maintains this specification across its full operating voltage range (1.7 V to 6 V).

Does TLV809ED29DBZR require an external pull-up resistor on the RESET pin?

No, TLV809ED29DBZR does not require an external pull-up resistor because it features a push-pull active-low output topology. The internal driver actively pulls RESET low during fault conditions and drives it high (to VDD) when deasserted. This eliminates board space and BOM cost associated with external resistors and ensures predictable rise/fall times. TLV809ED29DBZR can sink up to 2 mA while maintaining VOL ≤ 300 mV, supporting direct interface with most MCU reset inputs.

What is the reset delay time for TLV809ED29DBZR and how is it implemented?

The TLV809ED29DBZR has a fixed 50 ms reset delay time (tD), corresponding to variant "D" in TI's device nomenclature. This delay is generated by an internal precision timer and is independent of external components or supply voltage. After VDD rises above VIT+, TLV809ED29DBZR holds RESET low for exactly 50 ms (with ±10% variation over temperature) before releasing it. This ensures consistent reset hold time across all operating conditions, eliminating variability introduced by RC-based delays.

Can TLV809ED29DBZR operate reliably at very low supply voltages?

Yes, TLV809ED29DBZR guarantees defined output behavior down to a power-on-reset voltage (VPOR) of 700 mV. Below this level, the output state is undefined, but above it - including during brownout recovery from 0.7 V - TLV809ED29DBZR correctly asserts RESET when VDD falls below 2.93 V and holds it for 50 ms after crossing VIT+. This capability is critical for applications like energy-harvesting systems or deeply discharged batteries where supply may ramp slowly from sub-1 V.

Is TLV809ED29DBZR pin-compatible with legacy supervisors like MAX809?

Yes, TLV809ED29DBZR is pin-to-pin compatible with MAX809/803/810 and APX803/809/810 in the SOT-23-3 (DBZ) package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = VDD matches the industry-standard footprint. However, TLV809ED29DBZR improves upon MAX809 with lower IQ (250 nA vs ~1.2 µA), tighter threshold accuracy (±0.5% vs ±2.5%), and specified glitch immunity (10 µs). No PCB changes are required for migration, but firmware timing margins should be verified due to differences in tD (50 ms vs 240 ms).