Texas Instruments TLC7725IDR

Overview

TLC7725IDR 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 2 V to 6 V supply range. It provides power-on reset generation, undervoltage supervision, and power-down control for static RAM with battery backup-used in medical imaging systems requiring reliable reset integrity under low-power conditions.

For engineers reviewing the TLC7725IDR datasheet, TLC7725IDR pinout, TLC7725IDR application, or TLC7725IDR equivalent, this page delivers verified specifications, DRB-package-compatible pin mapping, real-world use cases in battery-backed memory retention and microcontroller reset sequencing, and validated alternative options for design flexibility.

Technical Context

The TLC7725IDR implements a precision voltage sensor with temperature-compensated internal reference and hysteresis (70 mV) to prevent oscillation near threshold. Its internal timer generates a user-defined delay (td = 2.1 × 10⁴ × CT) after SENSE voltage recovers above 2.25 V before deasserting RESET.

It supports dual-mode reset control: when CONTROL is grounded, RESET becomes active-high; otherwise, it operates as active-low. The device maintains defined RESET output down to VDD ≥ 1 V and draws only 9–16 µA quiescent current-enabling long-term operation in energy-constrained embedded systems.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (D), 3.91 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G25DBVR and MAX6326UT23D3+, the TLC7725IDR uniquely combines programmable delay, dual-mode RESET polarity, and SRAM power-down support-making it the only option among the three that enables hardware-controlled memory isolation during brownout.

Availability

TLC7725IDR is available at Aetrix Electronics and suitable for medical imaging systems, industrial PLCs, battery-backed memory modules, and low-power sensor nodes requiring stable component supply across long production lifecycles.

Supply support for TLC7725IDR 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 technologies for industrial, automotive, and consumer applications.

The TLC77xx family was designed specifically for micropower supply supervision in microcomputer systems-emphasizing precision threshold accuracy, low quiescent current, and integrated power-down control for battery-backed memory.

FAQ

What is the exact threshold voltage tolerance for TLC7725IDR?

The TLC7725IDR has a guaranteed negative-going input threshold voltage (V_IT–) of 2.18 V (min) to 2.32 V (max) over full operating conditions, with typical value 2.25 V. This 70 mV hysteresis band ensures robust immunity to supply noise and prevents false resets during marginal voltage conditions. All test data is specified at VDD = 2 V to 6 V and TA = –40°C to 85°C per SLVS087M.

How do I configure TLC7725IDR for active-high RESET output?

To configure TLC7725IDR for active-high RESET, tie the CONTROL pin to GND. When CONTROL = GND, the internal logic inverts the default active-low RESET signal, producing an active-high output. This mode is essential for interfacing with microcontrollers or FPGAs that require high-asserted reset signals. The TLC7725IDR datasheet confirms this behavior in Table 1 (Function Table) and Figure 10 (Data Retention Application).

What external capacitor value yields a 100 ms reset delay with TLC7725IDR?

A 100 ms reset delay requires a 4.76 nF external capacitor on the CT pin of TLC7725IDR, calculated using td = 2.1 × 10⁴ × CT. Rearranged: CT = td / 2.1 × 10⁴ = 0.1 / 21000 ≈ 4.76 × 10⁻⁹ F. Standard 4.7 nF ceramic capacitors (X7R, 10% tolerance) are recommended for stability and temperature performance. The TLC7725IDR Electrical Characteristics table specifies testing with CT = 0.1 µF, but the formula applies across the valid capacitance range.

Does TLC7725IDR support operation below 2 V supply?

No, TLC7725IDR is not specified for operation below 2 V. The Recommended Operating Conditions table explicitly defines VDD min = 2 V. While RESET output is defined down to VDD ≥ 1 V for assertion during brownout, functional supervision-including accurate threshold comparison and delay timing-requires VDD ≥ 2 V. Attempting operation below 2 V may result in undefined behavior, missing reset pulses, or excessive propagation delay variation.

Is TLC7725IDR pin-compatible with other TLC77xx variants like TLC7705IDR?

Yes, TLC7725IDR is pin-compatible with all 8-pin SOIC (D-package) members of the TLC77xx family-including TLC7701IDR, TLC7703IDR, TLC7733IDR, and TLC7705IDR-sharing identical pinout, footprint, and electrical interface. Threshold voltage differs per variant (2.25 V for TLC7725IDR vs. 4.55 V for TLC7705IDR), but PCB layout and interconnect remain unchanged. This allows direct substitution in existing designs when adjusting supervision level.