Texas Instruments TPS3897PDRYR

Overview

TPS3897PDRYR from Texas Instruments is a single-channel, adjustable-voltage supervisor IC with open-drain output, designed for system reset and power monitoring in space-constrained applications. It features 0.5 V adjustable threshold (±1% over –40°C to 125°C), capacitor-adjustable 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 monitor core or I/O rails in FPGAs, microcontrollers, and portable electronics.

For engineers reviewing the TPS3897PDRYR datasheet, TPS3897PDRYR pinout, TPS3897PDRYR application, or TPS3897PDRYR equivalent, key selection considerations include its ultra-small USON-6 (1.45 mm × 1.00 mm) package, 18 V open-drain output compatibility, active-high ENABLE logic, and precise 0.5 V reference-based threshold programming via external resistor divider.

Technical Context

The TPS3897PDRYR implements a precision voltage comparator with 5 mV hysteresis and a 310 nA CT-pin current source to charge an external capacitor for timing control. Its internal 0.5 V reference enables user-defined thresholds down to 500 mV using a two-resistor divider on the SENSE pin.

It supports dual functional modes: immediate output deassertion (<16 µs propagation delay) when SENSE falls below V_IT+ – V_HYS or ENABLE is deasserted, and fixed 0.2 µs ENABLE-to-SENSE_OUT assertion delay - distinguishing it from the A-version's capacitor-timed enable path.

Key Specifications

Pinout & Package

TPS3897PDRYR is housed in a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3897PDRYR, TPS3897ADRVR offers flexible ENABLE timing at the cost of added complexity, while MAX6897TTA+T trades accuracy, power, and voltage headroom for second-source availability - making TPS3897PDRYR optimal for new designs prioritizing precision, low IQ, and 18 V interoperability.

Availability

TPS3897PDRYR is available at Aetrix Electronics and suitable for FPGA configuration monitoring, battery-powered MCU wake-up, processor power-on reset, and multi-rail sequencing control requiring stable component supply and guaranteed long-term manufacturability.

Supply support for TPS3897PDRYR 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 with over 90 years of engineering excellence and broad manufacturing scale.

The TPS389x family was developed to address demand for ultra-miniature, low-power voltage supervisors in portable, automotive, and industrial systems - emphasizing precision thresholding, flexible timing, and robust packaging.

FAQ

What is the minimum detectable voltage threshold for TPS3897PDRYR?

The TPS3897PDRYR has a fixed 0.5 V internal reference, enabling user-programmable thresholds starting at 0.5 V using an external resistor divider on the SENSE pin. With standard 1% resistors, thresholds as low as 0.5 V can be set with ±1% accuracy across –40°C to 125°C - making TPS3897PDRYR suitable for monitoring modern sub-1 V rails like 0.8 V FPGA cores or 0.9 V microcontroller I/O banks.

Does TPS3897PDRYR require an external pull-up resistor on SENSE_OUT?

Yes, TPS3897PDRYR features an open-drain SENSE_OUT pin rated for up to 18 V, which requires an external pull-up resistor to define the high logic level. The resistor value must be selected based on sink current limits (≤1 mA) and target pull-up voltage - e.g., ≥18 kΩ for 18 V pull-up. This design enables voltage-level translation and wired-OR reset bus configurations not possible with push-pull outputs.

How is the reset delay time configured on TPS3897PDRYR?

The reset delay time on TPS3897PDRYR is set by connecting an external capacitor between the CT pin and GND. The delay follows t_pd(r) = [C_CT(µF) × 4] + 40 µs, yielding ranges from 40 µs (CT open) to 190 ms (47 nF). A 100 nF ceramic capacitor achieves ~440 µs delay. Stray capacitance must be minimized, and low-leakage dielectrics (X7R, C0G) are recommended to maintain timing accuracy.

What is the ENABLE pin behavior during power-up of TPS3897PDRYR?

During power-up, the ENABLE pin of TPS3897PDRYR remains inactive until VCC exceeds 1.7 V. Once powered, a high ENABLE signal initiates SENSE_OUT assertion after the CT-configured delay (or 0.2 µs if SENSE is already above threshold), while a low ENABLE forces immediate SENSE_OUT low - enabling precise external control of reset timing independent of supply ramp rate. This behavior is documented in the TPS3897PDRYR truth table and timing diagrams.

Can TPS3897PDRYR monitor voltages above its VCC supply?

No - the SENSE pin voltage must remain within 0 V to 6.5 V and cannot exceed VCC by more than 0.3 V per absolute maximum ratings. However, TPS3897PDRYR can monitor higher-voltage rails (e.g., 12 V) indirectly using a resistor divider that scales the input to ≤6.5 V and ≥0.5 V at the SENSE pin. The 18 V-rated open-drain SENSE_OUT output does support pull-up to voltages exceeding VCC, but the monitored input itself must comply with the SENSE pin voltage limits.