STMicroelectronics TL7702AIP/A

Overview

TL7702AIP/A from STMicroelectronics is a precision supply voltage supervisor IC designed for power-on and brown-out reset generation in microcontroller systems. It features a fixed 2.5 V threshold (±2%), true/complement RESET outputs, externally adjustable reset pulse width via CT pin (1.3×10⁴×C_T), and operates across 3.6–18 V supply range with –25°C to 85°C temperature rating.

For engineers reviewing the TL7702AIP/A datasheet, TL7702AIP/A pinout, TL7702AIP/A application, or TL7702AIP/A equivalent, key selection considerations include its fixed 2.5 V sensing threshold, dual active-high/active-low reset outputs, external capacitor-controlled delay timing, and compatibility with 5 V and 12 V embedded power rails requiring reliable cold-start and undervoltage recovery.

Technical Context

The TL7702AIP/A integrates a temperature-compensated 2.5 V bandgap reference and precision comparator to monitor the SENSE input against a fixed threshold. Its internal state machine asserts RESET (high) and RESET (low) simultaneously during power-up or supply dip until voltage stabilizes above VT+ and the CT-timed delay expires.

Reset pulse width is fully determined by an external capacitor on pin 3 (CT), enabling design flexibility from ~0.65 ms to >1 s. The REF pin (pin 1) supplies a stable 2.53 V reference and requires a 0.1 µF bypass capacitor to suppress fast transients affecting threshold accuracy.

Key Specifications

Pinout & Package

TL7702AIP/A is housed in an 8-pin plastic DIP (Minidip) package with 2.54 mm lead pitch, suitable for through-hole prototyping and legacy industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVR and MAX691CPD+, the TL7702AIP/A uniquely delivers fixed 2.5 V sensing, dual true/complement outputs, and a REF pin in a through-hole DIP package-making it optimal for legacy industrial designs needing simplicity, reliability, and no external divider.

Availability

TL7702AIP/A is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, medical infusion devices, and smart energy metering systems requiring stable component supply and long-term obsolescence management.

Supply support for TL7702AIP/A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The TL7700A series belongs to ST's analog power-supervision product line, engineered specifically for robust, low-cost reset control in microprocessor-based systems operating under variable or noisy supply conditions.

FAQ

What is the exact sense threshold voltage for TL7702AIP/A, and how does it vary with temperature?

The TL7702AIP/A has a nominal sense threshold of 2.5 V, specified from 2.48 V to 2.58 V at 25°C. Over the full –25°C to +85°C operating range, the threshold remains within ±2% of nominal due to integrated temperature compensation. Hysteresis is maintained at ≥10 mV across temperature, preventing oscillation during slow supply ramps.

Can TL7702AIP/A monitor a 3.3 V supply directly without external resistors?

Yes. With its fixed 2.5 V threshold and 10 mV hysteresis, the TL7702AIP/A directly monitors standard 3.3 V rails. The SENSE pin accepts up to Vs − 1 V (or 6 V, whichever is lower), so at 3.3 V supply, it safely reads the rail without attenuation. No resistor divider is needed-reducing component count and improving accuracy.

How is the reset pulse width calculated, and what capacitor value yields a 100 ms delay?

Pulse width tpo = 1.3 × 10⁴ × C_T seconds. To achieve 100 ms (0.1 s), solve C_T = 0.1 / 1.3×10⁴ = 7.69 nF. A standard 8.2 nF capacitor yields tpo ≈ 107 ms. Layout best practice: place CT close to pin 3 with short traces and avoid noisy routing near this node.

Does TL7702AIP/A provide both active-high and active-low reset outputs simultaneously?

Yes. Pin 4 (RESET) is open-collector active-high (requires external pull-up), and pin 7 (RESET) is push-pull active-low. Both outputs assert concurrently during power-up or brown-out events and release together after the CT-timed delay. This eliminates need for external inverters in systems requiring dual-polarity reset signaling.