Texas Instruments TLV809I50DBZR

Overview

TLV809I50DBZR from Texas Instruments is a 3-pin push-pull supply voltage supervisor IC designed for undervoltage monitoring of 5-V systems. It features a fixed 4.55-V detection threshold (V_IT–), 200-ms reset delay, 9-µA typical supply current, and operates across –40°C to +85°C. It ensures reliable power-on reset for DSPs, microcontrollers, and FPGAs in industrial and embedded applications.

For engineers reviewing the TLV809I50DBZR datasheet, TLV809I50DBZR pinout, TLV809I50DBZR application, or TLV809I50DBZR equivalent, key selection criteria include its precise 4.55-V threshold, push-pull RESET output, SOT-23 (DBZ) package compatibility, low quiescent current, and immunity to fast VDD transients per tw ≥ 10 µs specification.

Technical Context

The TLV809I50DBZR implements a precision bandgap reference and comparator-based sensing architecture with internal hysteresis (60 mV) to prevent chatter during threshold crossing. Its active-low push-pull RESET output drives directly without external pull-up, supporting logic-level interfacing with standard CMOS inputs.

During power-up, RESET asserts when VDD exceeds 1.1 V and remains active until VDD rises above 4.45 V (min), then holds for 120–280 ms before deassertion. On power-down or brownout, RESET reasserts immediately when VDD falls below 4.65 V (max), ensuring deterministic system initialization and fault recovery.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809I50DBZR, TLV809I50DBVR offers identical performance in a slightly larger SOT-23 variant, while MAX809TRD3+T provides legacy drop-in capability at the cost of higher threshold tolerance, open-drain limitations, and reduced timing precision-making TLV809I50DBZR preferable for new designs demanding low power, push-pull simplicity, and tight 4.55-V accuracy.

Availability

TLV809I50DBZR is available at Aetrix Electronics and suitable for factory automation, electricity meters, and building automation systems requiring stable component supply, long-term lifecycle support, and industrial-temperature qualification.

Supply support for TLV809I50DBZR 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 over 90 years of innovation in power management, signal chain, and microcontroller technologies.

The TLV809 family belongs to TI's precision voltage supervisor product line, engineered specifically for reliable power sequencing and reset generation in industrial, metering, and infrastructure applications where accuracy, low power, and small size are critical.

FAQ

What is the exact reset threshold voltage of the TLV809I50DBZR?

The TLV809I50DBZR has a nominal undervoltage detection threshold of 4.55 V, with a guaranteed range of 4.45 V (min) to 4.65 V (max) across –40°C to +85°C. This value is factory-trimmed and specified in Table 5-1 of the datasheet; it is optimized for monitoring standard 5-V power rails with appropriate headroom for LDO dropout and line regulation.

Does the TLV809I50DBZR require an external pull-up resistor on the RESET pin?

No, the TLV809I50DBZR does not require an external pull-up resistor because it features a push-pull RESET output stage. The device actively drives high (VOH ≥ VDD – 0.2 V) and low (VOL ≤ 0.3 V at 500 µA), enabling direct interface with CMOS inputs. This eliminates BOM components and improves noise immunity compared to open-drain supervisors like the TLV803 series.

What is the purpose of the 200-ms reset delay in the TLV809I50DBZR?

The 200-ms reset delay (t_d) in the TLV809I50DBZR ensures that the RESET signal remains asserted long enough for downstream processors, FPGAs, or ASICs to complete internal power-up initialization. With a typical value of 200 ms and guaranteed range of 120–280 ms, this delay meets common boot timing requirements for ARM Cortex-M, TI C2000, and Xilinx Zynq devices, preventing premature release from reset.

Can the TLV809I50DBZR be used to monitor a 3.3-V supply?

No, the TLV809I50DBZR is not suitable for monitoring a 3.3-V supply because its fixed 4.55-V threshold exceeds the nominal rail voltage. For 3.3-V systems, TI recommends the TLV809K33 (2.93-V threshold) or TLV809L30 (2.64-V threshold). Using TLV809I50DBZR on 3.3 V would cause continuous RESET assertion, rendering the system non-operational.

What package type and marking does the TLV809I50DBZR use?

The TLV809I50DBZR uses the SOT-23 (DBZ) package with dimensions 2.92 mm × 1.30 mm and is marked "BCMV" on the top surface. It is supplied in 3000-piece large tape-and-reel format (RoHS-compliant, NIPDAU/SN lead finish, MSL Level-1), and is distinct from the DBV variant (marked VTBI) which uses a slightly wider 2.90 mm × 1.60 mm outline.