Texas Instruments TLC7725QDR

Overview

TLC7725QDR from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.25 V sense threshold, designed for reset control in microcomputer systems. It features power-on reset generation, automatic reset after voltage drop, programmable delay via external capacitor (td = 2.1 × 10⁴ × CT), defined RESET output down to VDD ≥1 V, and operates across –40°C to 125°C in an 8-pin SOIC package.

For engineers reviewing the TLC7725QDR datasheet, TLC7725QDR pinout, TLC7725QDR application, or TLC7725QDR equivalent, this device supports critical power-monitoring tasks in automotive engine control units, industrial PLCs, and medical imaging equipment where low quiescent current (16 µA max) and extended temperature reliability are essential.

Technical Context

The TLC7725QDR integrates a precision temperature-compensated voltage reference and internal timer to assert RESET when SENSE voltage falls below 2.25 V (with 70 mV hysteresis), holding it active until both threshold recovery and programmable delay expiration occur. Its totem-pole outputs drive high-impedance loads directly without pull-up resistors.

It supports power-down control for static RAM with battery backup via CONTROL pin logic: tying CONTROL to GND enables active-high RESET, enabling automatic chip-select disable during brownout. The device draws only 9–16 µA supply current at VDD = 5 V and maintains functional RESET assertion even as VDD drops to 1 V.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (D), 3.91 mm × 4.9 mm, 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+T, the TLC7725QDR uniquely delivers dual active-high/active-low reset outputs, manual reset input, and dedicated CONTROL logic for SRAM power-down - making it the only option among the three that fully implements TI's documented battery-backup retention architecture.

Availability

TLC7725QDR is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical imaging power modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC7725QDR 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 automotive-grade qualification.

The TLC77xx family was engineered specifically for robust power-supply monitoring in safety-critical embedded systems, emphasizing low IQ, wide temperature operation, and integrated power-down control for battery-backed memory.

FAQ

What is the exact sense threshold voltage of the TLC7725QDR?

The TLC7725QDR has a fixed negative-going input threshold voltage (VIT–) of 2.25 V, with a typical tolerance of ±0.07 V (2.18 V to 2.32 V) over the full operating temperature range of –40°C to 125°C. This value is internally trimmed and does not require external resistor programming like the TLC7701.

How is the reset delay time set on the TLC7725QDR?

The reset delay time (td) on the TLC7725QDR is set externally using a capacitor connected between the CT pin (pin 8) and GND. The relationship is td = 2.1 × 10⁴ × CT, where CT is in farads and td is in seconds - for example, a 100 nF capacitor yields ~2.1 ms delay. No resistor is required.

Does the TLC7725QDR support active-high reset output?

Yes, the TLC7725QDR provides both active-low RESET (pin 4) and active-high RESET (pin 7) outputs simultaneously. The polarity is fixed and complementary - when RESET is low, RESET is high, enabling direct interfacing with MCUs or FPGAs requiring either reset logic level without inverters.

Can the TLC7725QDR be used to protect battery-backed SRAM during power loss?

Yes, the TLC7725QDR supports SRAM power-down control via its CONTROL pin (pin 3). When CONTROL is tied to GND, RESET becomes active-high - allowing it to directly drive the chip select (CS) line of static RAM. During main power failure, the device disables memory access automatically while powered by the backup battery.

What is the minimum supply voltage at which the TLC7725QDR asserts RESET during power-up?

The TLC7725QDR asserts RESET during power-up when VDD reaches 1 V - this is its power-up reset voltage (Vres). This ensures early, deterministic reset assertion before the monitored rail or host microcontroller reaches functional voltage levels, preventing erratic startup behavior.