Texas Instruments TPS3897PDRYT

Overview

TPS3897PDRYT from Texas Instruments is a single-channel, adjustable-voltage supervisor IC with open-drain output, 0.5 V threshold, ±1% over temperature accuracy, 6 µA typical quiescent current, and 0.2 µs enable-to-output propagation delay-used for precise power-on reset and supply monitoring in low-voltage microcontroller and FPGA systems.

For engineers reviewing the TPS3897PDRYT datasheet, TPS3897PDRYT pinout, TPS3897PDRYT application, or TPS3897PDRYT equivalent, key selection criteria include its ultra-small USON-6 package (1.45 mm × 1.00 mm), 18 V open-drain output rating, capacitor-adjustable delay via CT pin, active-high ENABLE logic, and operation across –40°C to 125°C.

Technical Context

The TPS3897PDRYT implements a precision comparator with 0.5 V internal reference and 5 mV hysteresis to detect SENSE voltage exceeding V_IT+, triggering an open-drain output assertion after either a fixed 0.2 µs delay (ENABLE-driven) or user-defined capacitor-adjustable delay (SENSE-driven). Its CT pin integrates a 310 nA current source charging an external capacitor to 1.24 V for timing control.

It supports dual-input supervision logic: SENSE monitors system rail voltage via external resistor divider, while ENABLE provides synchronous system-level control; both must be valid before output assertion. The device deasserts within 16 µs when either input fails, ensuring fast fault response without latch-up.

Key Specifications

Pinout & Package

TPS3897PDRYT is housed in a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for space-constrained PCB layouts in portable and high-density electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3897PDBVR, the TPS3897PDRYT offers identical functionality in a smaller reel size ideal for evaluation and small-batch builds; versus MAX6897TTA+T, it delivers tighter threshold accuracy, half the quiescent current, and programmable delay - making it preferable for next-generation low-power, high-precision systems.

Availability

TPS3897PDRYT is available at Aetrix Electronics and suitable for microcontroller reset, FPGA configuration monitoring, battery-powered system supervision, and industrial PLC I/O module supply monitoring requiring stable component supply and long-term design-in support.

Supply support for TPS3897PDRYT 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 designed specifically for space-constrained, low-power systems requiring highly accurate, adjustable-voltage supervision with minimal board area - targeting next-generation portable, automotive, and industrial electronics.

FAQ

What is the minimum detectable voltage threshold for the TPS3897PDRYT?

The TPS3897PDRYT has a fixed internal threshold of 0.5 V ±1% over temperature. It can monitor any supply ≥0.5 V using an external resistor divider on the SENSE pin - for example, a 3.3 V rail is monitored by setting R1/R2 = 5.6 to achieve VTARGET = 3.3 V per VTARGET = (1 + R1/R2) × 0.5 V. The TPS3897PDRYT itself does not require adjustment to change threshold.

Does the TPS3897PDRYT support both push-pull and open-drain outputs?

No - the TPS3897PDRYT exclusively features an open-drain output (SENSE_OUT) rated to 18 V, requiring an external pull-up resistor. Push-pull variants exist in the same family (e.g., TPS3895PDRYT), but the '7' suffix denotes open-drain configuration. This allows level translation and wired-OR reset bus implementation not possible with push-pull outputs.

How is the reset delay time configured on the TPS3897PDRYT?

The TPS3897PDRYT supports two delay modes: (1) 0.2 µs fixed delay from ENABLE assertion to SENSE_OUT transition (when SENSE > V_IT+), and (2) capacitor-adjustable delay from SENSE rising above V_IT+, set by connecting a capacitor between CT and GND. Delay follows t_pd(r) = [C_CT(µF) × 4] + 40 µs - e.g., 0.047 µF yields ~230 ms.

Can the TPS3897PDRYT monitor a 12 V supply directly?

No - the SENSE pin maximum voltage is 6.5 V per recommended operating conditions. To monitor a 12 V supply, use an external resistor divider to scale it down to ≤6.5 V at the SENSE pin. For example, R1 = 1.4 MΩ and R2 = 100 kΩ yields 0.5 V at SENSE when VIN = 7.5 V, satisfying the 0.5 V threshold requirement while staying within absolute max ratings.

What is the purpose of the CT pin on the TPS3897PDRYT?

The CT pin on the TPS3897PDRYT connects to an internal 310 nA current source that charges an external capacitor to 1.24 V; the time required determines the SENSE-triggered reset delay. Leaving CT open yields 40 µs delay; adding 0.047 µF extends it to ~230 ms. This eliminates need for external timers or firmware delays in power sequencing circuits.