Texas Instruments TLC7725ID

Overview

TLC7725ID from Texas Instruments is a micropower supply voltage supervisor IC designed for reset control in microcomputer and microprocessor systems. It features a fixed 2.25 V sense threshold, programmable delay via external capacitor (td = 2.1 × 10⁴ × CT), defined RESET output down to VDD ≥1 V, 16 µA max supply current, and operates across –40°C to 85°C in an 8-pin SOIC (D) package.

For engineers reviewing the TLC7725ID datasheet, TLC7725ID pinout, TLC7725ID application, or TLC7725ID equivalent, this device delivers precision undervoltage monitoring with power-on reset generation, automatic reset after voltage drop, and power-down control support for static RAM with battery backup - critical for reliable system initialization and data retention.

Technical Context

The TLC7725ID implements a precision voltage sensor with temperature-compensated internal reference and 70 mV hysteresis to prevent chatter near threshold. Its SENSE input monitors supply rail voltage relative to the fixed 2.25 V threshold, asserting active-low RESET when VI(SENSE) falls below VIT– and holding it active until both threshold recovery and programmable delay td expire.

It supports dual-mode operation: when CONTROL is grounded, RESET becomes active-high; when CONTROL is tied to VDD, RESET remains active-low. This enables flexible integration with memory bank select signals (e.g., CSH1) to disable SRAM during power failure while maintaining battery-backed operation.

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 TLC7725QD, the TLC7725ID offers identical electrical behavior at lower cost and smaller thermal footprint for ambient-limited applications; versus TPS3808G25DBVR, it trades ultra-low IQ for design flexibility in delay configuration and SRAM power-down control - making it superior for systems requiring adaptive reset timing and memory management.

Availability

TLC7725ID is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for TLC7725ID 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 systems, emphasizing precision threshold stability, programmable reset timing, and integrated power-down control for battery-backed memory - targeting medical, industrial, and automotive edge nodes.

FAQ

What is the exact sense threshold voltage of the TLC7725ID?

The TLC7725ID has a fixed negative-going input threshold voltage (VIT–) of 2.25 V, with a tolerance of ±0.07 V over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS087M datasheet. The TLC7725ID does not require external resistors to set this threshold, distinguishing it from the adjustable TLC7701 variant.

How do I calculate the reset delay time for the TLC7725ID?

The reset delay time (td) for the TLC7725ID is calculated using the formula td = 2.1 × 10⁴ × CT, where CT is the external capacitor value in farads. For example, a 100 nF capacitor yields td ≈ 2.1 ms. This delay begins after the SENSE voltage recovers above threshold and ensures the system remains held in reset long enough for stable power and clock settling. The TLC7725ID datasheet confirms this relationship applies across its full operating voltage and temperature range.

Does the TLC7725ID support active-high and active-low reset outputs simultaneously?

Yes, the TLC7725ID provides both active-low RESET (Pin 3) and active-high RESET (Pin 8) outputs simultaneously. Their logic states are complementary: when RESET (Pin 3) is low, RESET (Pin 8) is high, and vice versa. This dual-output capability eliminates the need for external inverters in systems requiring either polarity, and both outputs are fully buffered to drive standard CMOS loads without additional buffering.

Can the TLC7725ID be used to control static RAM during power failure?

Yes, the TLC7725ID supports power-down control for static RAM with battery backup via its CONTROL pin. When CONTROL is driven low (e.g., by microprocessor bank select signal CSH1), the RESET output becomes active-high and can directly drive the SRAM chip select (CS) input. This automatically disables the memory during power loss while the TLC7725ID itself remains powered by the backup battery - a documented application shown in Figure 10 of the SLVS087M datasheet.

What is the maximum supply current of the TLC7725ID under normal operation?

The maximum supply current (IDD) of the TLC7725ID is 16 µA under recommended operating conditions (VDD = 5 V, TA = 25°C, outputs open). This value is guaranteed across the full temperature range (–40°C to +85°C) and supply range (2 V to 6 V), making the TLC7725ID suitable for battery-powered and energy-harvesting applications where ultra-low quiescent current is essential for extended operational life.