Texas Instruments TL7702ACDR

Overview

TL7702ACDR from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in microprocessor and embedded systems. It features a 2.53 V ±5 mV threshold voltage (V_IT−), operates from 3.5 V to 18 V supply, delivers dual active-high/active-low reset outputs (RESET and RESET), and supports externally adjustable reset pulse duration via CT capacitor. It is used in industrial controllers requiring reliable power-on and brownout reset sequencing.

For engineers reviewing the TL7702ACDR datasheet, TL7702ACDR pinout, TL7702ACDR application, or TL7702ACDR equivalent, key selection criteria include its 2.53 V undervoltage detection threshold, SOIC-8 package compatibility, dual complementary reset outputs, and temperature-compensated reference stability over 0°C to 70°C.

Technical Context

The TL7702ACDR integrates a precision bandgap reference, comparator with hysteresis (10 mV), delay timer controlled by external CT capacitor, and dual open-collector reset drivers. Its SENSE input monitors system supply voltage, triggering RESET/RESET when V_SENSE falls below 2.53 V (typical) and holding reset for ≥0.65 ms after recovery.

It functions as a standalone reset controller without external logic: internal thyristor-based timing ensures deterministic reset assertion during power-up (V_CC ≥ 3.6 V) and power-down (outputs remain active until V_CC < 2 V), with REF output usable as a stable 2.53 V reference source.

Key Specifications

Pinout & Package

TL7702ACDR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, RoHS-compliant, with NiPdAu lead finish and Level-1 moisture sensitivity rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01QDBVRQ1 and MAX6816EUT+T, TL7702ACDR uniquely combines 2.53 V precision threshold, externally adjustable reset timing, dual complementary outputs, and usable reference voltage-making it irreplaceable for commercial embedded systems requiring flexible, accurate power-supply supervision.

Availability

TL7702ACDR is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, point-of-sale terminals, and smart metering applications requiring stable component supply and long-term production continuity.

Supply support for TL7702ACDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The TL77xxA family was engineered specifically as cost-effective, precision supply-voltage supervisors for microcomputer reset control-emphasizing robustness, wide supply range, and minimal external components.

FAQ

What is the exact undervoltage detection threshold of TL7702ACDR?

The TL7702ACDR has a guaranteed negative-going input threshold voltage (V_IT−) of 2.48 V to 2.58 V at 25°C, with typical value 2.53 V. This threshold is factory-trimmed and temperature-compensated, enabling precise supervision of 2.5 V system rails without external resistor dividers.

Does TL7702ACDR require external components to operate?

Yes, TL7702ACDR requires three external components for basic operation: a 0.1 µF capacitor on CT to set reset pulse duration, a 0.1 µF capacitor on REF for reference stability, and pull-up resistors on RESET and RESET outputs (open-collector). No external resistors are needed for threshold setting, as V_IT− is internal and fixed at 2.53 V.

Can TL7702ACDR monitor voltages higher than its own VCC supply?

No. For TL7702ACDR, the SENSE input voltage must not exceed min(V_CC − 1 V, 6 V). So if V_CC = 5 V, SENSE must stay ≤ 4 V; if V_CC = 12 V, SENSE must stay ≤ 6 V. To supervise higher rails, use a resistor divider to scale the voltage into this safe range before connecting to SENSE.

What is the function of the REF pin on TL7702ACDR?

The REF pin on TL7702ACDR provides a stable, temperature-compensated 2.53 V output derived from the internal bandgap reference. It can serve as an accurate analog reference for ADCs, DACs, or comparators in the same system-reducing BOM count and improving supply-monitoring consistency across subsystems.

How does TL7702ACDR behave during power-down?

During power-down, TL7702ACDR keeps RESET and RESET active (RESET = high, RESET = low) as long as SENSE remains below 2.53 V or V_CC stays above 2 V. When V_CC falls below 2 V, outputs become undefined. This behavior ensures sustained reset assertion through brownout, preventing partial or unstable MCU operation.