Texas Instruments TLC7725IDRG4

Overview

TLC7725IDRG4 from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.25 V threshold, active-low RESET output, programmable delay via external capacitor, and operation across –40°C to 85°C. It monitors VDD (2–6 V), asserts RESET below threshold, supports power-down control for battery-backed SRAM, and draws only 16 µA typical supply current.

For engineers reviewing the TLC7725IDRG4 datasheet, TLC7725IDRG4 pinout, TLC7725IDRG4 application, or TLC7725IDRG4 equivalent, this page delivers verified electrical specs, DRB-package pin mapping, real-world use cases in medical imaging and industrial microcontroller systems, and validated alternative options for voltage monitoring and reset generation.

Technical Context

The TLC7725IDRG4 implements a precision voltage-sensing comparator with temperature-compensated internal reference and hysteresis (70 mV) to prevent chatter during threshold crossing. Its internal timer generates a user-defined reset delay (td = 2.1 × 10⁴ × CT) after SENSE voltage recovers above 2.25 V.

It features dual reset logic paths: power-on reset activation at VDD ≥ 1 V, and undervoltage supervision triggered when VI(SENSE) drops below VIT–. The CONTROL input enables active-high RESET mode for SRAM chip-select coordination during brownout events.

Key Specifications

Pinout & Package

Package: 8-pin SON (DRB), 3 mm × 3 mm, 0.5 mm pitch, exposed thermal pad (non-magnetic variant available for medical imaging).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G25DBVR and MAX6326UT23D3+T, the TLC7725IDRG4 uniquely combines programmable delay, SRAM power-down support via CONTROL, and robust 2.25 V threshold accuracy across industrial temperature range - making it optimal for cost-sensitive embedded systems requiring coordinated reset and memory retention.

Availability

TLC7725IDRG4 is available at Aetrix Electronics and suitable for medical imaging subsystems, industrial PLC controllers, battery-backed SRAM modules, and automotive body control units requiring stable component supply and long-term lifecycle support.

Supply support for TLC7725IDRG4 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 emphasis on reliability, longevity, and industrial-grade qualification.

The TLC77xx family was designed specifically for micropower supply monitoring in microcomputer and microprocessor systems, prioritizing low current consumption, precise threshold stability, and flexible reset timing control.

FAQ

What is the exact threshold voltage of the TLC7725IDRG4 and how is it specified?

The TLC7725IDRG4 has a fixed negative-going input threshold voltage (VIT–) of 2.25 V, with a guaranteed range of 2.18 V to 2.32 V across temperature and supply voltage (2 V to 6 V). This value is factory-trimmed and specified in the Electrical Characteristics table under "Negative-going input threshold voltage, SENSE" with test conditions VDD = 2 V to 6 V. It is not adjustable and applies directly to the SENSE pin.

How does the CONTROL pin affect the RESET output behavior in the TLC7725IDRG4?

In the TLC7725IDRG4, the CONTROL pin determines RESET polarity: when CONTROL is tied to GND, RESET becomes active-high; when CONTROL is tied to VDD, RESET is active-low (default). This feature enables direct interface with SRAM chip-select inputs during power failure, allowing automatic memory disable without external logic. The function is explicitly defined in the Functional Block Diagram and Table 1.

What package type and pin count does the TLC7725IDRG4 use, and is it RoHS-compliant?

The TLC7725IDRG4 uses an 8-pin SON (Small Outline No-lead) package designated DRB, measuring 3 mm × 3 mm with 0.5 mm pitch and an exposed thermal pad. It is RoHS-compliant with NiPdAu lead finish, MSL Level-1 rating, and peak reflow tolerance of 260°C. Package details are confirmed in TI's official Package Option Addendum for orderable part number TLC7725IDRG4.

Can the TLC7725IDRG4 be used to monitor a 3.3 V supply, and what is the recommended external capacitor value?

Yes, the TLC7725IDRG4 is suitable for monitoring a 3.3 V supply because its 2.25 V threshold provides adequate margin (≥1.05 V headroom) and its SENSE input operates up to VDD. For a typical 2.1 ms reset delay, a 100 nF ceramic capacitor (CT) is recommended per the formula td = 2.1 × 10⁴ × CT. TI specifies CT = 100 nF in Switching Characteristics test conditions and recommends X7R dielectric with ≤100 pF parasitic capacitance.

Does the TLC7725IDRG4 support operation down to 1 V supply, and what happens to RESET below 2 V?

The TLC7725IDRG4 asserts RESET when VDD rises to ≥1 V during power-on (Vres = 1 V), but its functional operation requires VDD ≥2 V per Recommended Operating Conditions. Below 2 V, the internal reference and comparator may not maintain specification - RESET remains asserted until VDD reaches ≥2 V and SENSE exceeds 2.25 V for the programmed delay period. This behavior is documented in the Description and Absolute Maximum Ratings sections.