Texas Instruments TPS3898ADRYT

Overview

TPS3898ADRYT from Texas Instruments is an ultra-small, active-low enable, open-drain voltage supervisor IC designed for precision power-rail monitoring in space-constrained embedded systems. It features a 0.5 V adjustable threshold (±1% over –40°C to 125°C), capacitor-programmable delay (40 µs to 190 ms), 6 µA typical quiescent current, and operates from 1.7 V to 6.5 V supply. It is used to assert reset or enable signals to FPGAs, microcontrollers, and ASICs during power-up or brownout events.

For engineers reviewing the TPS3898ADRYT datasheet, TPS3898ADRYT pinout, TPS3898ADRYT application, or TPS3898ADRYT equivalent, key selection criteria include its active-low ENABLE logic, open-drain SENSE_OUT rated to 18 V, USON-6 (1.45 mm × 1.00 mm) package, temperature-stable 1% threshold accuracy, and compatibility with low-voltage system rails down to 1.7 V.

Technical Context

The TPS3898ADRYT implements a precision comparator with built-in 5 mV hysteresis to reject noise-induced false triggers during voltage transitions. Its internal 310 nA CT pin current source charges an external capacitor to set delay time per t_pd(r) = [C_CT (µF) × 4] + 40 µs, enabling accurate timing control without internal RC variation.

It uses an active-low ENABLE input that forces SENSE_OUT low immediately upon assertion, independent of SENSE voltage - critical for synchronized system shutdown. The open-drain output supports level-shifting up to 18 V, decoupling monitored rail voltage (e.g., 3.3 V) from host logic voltage (e.g., 5 V or 12 V).

Key Specifications

Pinout & Package

TPS3898ADRYT is housed in a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for ultra-dense PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3898PDRYT and MAX6898ATT+T, the TPS3898ADRYT uniquely delivers capacitor-adjustable delay with 1% threshold accuracy and 6 µA quiescent current in the same USON-6 footprint - making it optimal for precision, low-power, thermally demanding applications where timing flexibility is essential.

Availability

TPS3898ADRYT is available at Aetrix Electronics and suitable for FPGA configuration sequencing, automotive ADAS modules, battery-powered sensor nodes, and industrial PLC I/O conditioning requiring stable component supply across extended temperature ranges.

Supply support for TPS3898ADRYT 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS389x product line was engineered specifically for ultra-compact, high-accuracy voltage supervision in space-constrained, thermally aggressive environments - targeting next-generation portable electronics, automotive ECUs, and industrial edge controllers.

FAQ

What is the minimum detectable voltage threshold for the TPS3898ADRYT?

The TPS3898ADRYT has a fixed internal reference of 0.5 V at its SENSE pin. Using an external resistor divider, it can monitor any system voltage ≥0.5 V - for example, a 1.8 V rail is detected by setting R1/R2 = 2.6 to scale 1.8 V down to 0.5 V. The device guarantees ±1% threshold accuracy from –40°C to 125°C, making it suitable for low-voltage core rail supervision.

How does the CT pin set the delay time in the TPS3898ADRYT?

The CT pin on the TPS3898ADRYT connects to a ground-referenced capacitor. An internal 310 nA current source charges this capacitor until it reaches 1.24 V, triggering output assertion. Delay time follows t_pd(r) = [C_CT (µF) × 4] + 40 µs - e.g., a 47 nF capacitor yields ~190 ms delay. Leaving CT open gives a guaranteed 40 µs minimum delay.

Can the TPS3898ADRYT output drive a 12 V logic input directly?

Yes. The TPS3898ADRYT features an open-drain SENSE_OUT rated to 18 V. When used with an external pullup resistor to 12 V, it can directly assert a 12 V logic-low reset signal - no level shifter required. This decouples the supervisor's 1.7–6.5 V V_CC supply from the target logic voltage, simplifying multi-rail system design.

What is the propagation delay from SENSE falling below threshold to SENSE_OUT deassertion in the TPS3898ADRYT?

The TPS3898ADRYT deasserts SENSE_OUT within 16 µs (typical) after the SENSE voltage falls below V_IT+ – V_hys (i.e., 0.495 V). This fast turn-off response ensures immediate system reset release when supply recovers, critical for applications like dynamic voltage scaling or adaptive power management.

Is the TPS3898ADRYT compatible with the MAX6898 pinout and function?

Yes - the TPS3898ADRYT is explicitly documented as pin-for-pin compatible with the MAX6898 family. Both share identical USON-6 packaging, active-low ENABLE, open-drain SENSE_OUT, and 0.5 V threshold architecture. However, TPS3898ADRYT improves on threshold accuracy (1% vs. 2%) and quiescent current (6 µA vs. 10 µA), offering a drop-in performance upgrade.