Texas Instruments TL7702BCPG4

Overview

TL7702BCPG4 from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microcomputer systems. It monitors the SENSE input for undervoltage conditions, provides true and complement reset outputs (RESET and RESET), features a 2.53 V ±25 mV temperature-compensated reference voltage at REF, supports 3.6 V to 18 V supply range, and delivers defined reset behavior down to VCC ≥ 1 V - used in industrial control and embedded computing power-up sequencing.

For engineers reviewing the TL7702BCPG4 datasheet, TL7702BCPG4 pinout, TL7702BCPG4 application, or TL7702BCPG4 equivalent, this page delivers verified electrical characteristics, thermal metrics, timing behavior, and real-world implementation guidance - including CT-based pulse duration adjustment, open-collector output termination requirements, and RESIN-controlled reset override functionality.

Technical Context

The TL7702BCPG4 implements a dual-threshold comparator architecture with hysteresis (10 mV typical) on the SENSE input, enabling reliable detection of supply droop without chatter. Its internal current source charges an external capacitor at CT to generate a programmable reset pulse duration (td ≈ 2.6 × 10⁴ × CT), while the REF output delivers a stable 2.53 V reference for external monitoring or biasing.

It operates across 0°C to 70°C (C-suffix), uses SOIC-8 packaging (4.90 mm × 3.91 mm), and integrates both power-on reset generation and automatic reset assertion during brownout events - with RESET active low and RESET active high outputs driven via open-collector stages requiring external pullup/pulldown resistors.

Key Specifications

Pinout & Package

TL7702BCPG4 is housed in an 8-pin PDIP package (9.81 mm × 6.35 mm), lead-free with NIPDAU finish, rated for 0°C to 70°C operation, and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7705BCP and TPS3808G33DBVR, TL7702BCPG4 uniquely combines 2.53 V threshold accuracy, true/complement reset outputs, and a buffered reference voltage - making it optimal for 3.3 V microcontroller systems requiring deterministic reset timing and external analog support.

Availability

TL7702BCPG4 is available at Aetrix Electronics and suitable for industrial PLC control, embedded communication modules, server management controllers, and building automation nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7702BCPG4 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 communications markets.

The TL77xxB series was developed specifically for robust, low-cost reset control in microprocessor-based systems - emphasizing precision threshold accuracy, temperature stability, and flexible reset timing through external capacitor configuration.

FAQ

What is the exact undervoltage threshold voltage of TL7702BCPG4?

The TL7702BCPG4 has a nominal negative-going input threshold voltage (V_IT–) of 2.53 V at 25°C, with a guaranteed range of 2.505 V to 2.555 V under standard test conditions. Over its full operating temperature range (0°C to 70°C), the threshold remains within 2.48 V to 2.58 V, ensuring consistent 3.3 V rail supervision across environmental conditions.

How does the CT pin function in TL7702BCPG4?

The CT pin on TL7702BCPG4 connects to an external capacitor that determines reset pulse duration via td ≈ 2.6 × 10⁴ × C_T. For example, a 0.1 µF capacitor yields ~2.6 ms of reset assertion. The internal current source charges CT until it reaches ~1.8 V, then discharges to ~0.6 V - enabling precise, user-adjustable timing without requiring additional timing ICs.

Why does TL7702BCPG4 require both pullup and pulldown resistors on its outputs?

TL7702BCPG4 features open-collector RESET (active low) and RESET (active high) outputs. TI mandates matching 10 kΩ pullup and pulldown resistors - even if only one output is used - to prevent waveform plateauing during switching. This avoids undefined logic states that could delay or corrupt system reset sequences in microcontroller interfaces.

Can TL7702BCPG4 monitor its own VCC supply directly?

Yes, TL7702BCPG4 can monitor VCC directly via the SENSE pin, but TI recommends adding a current-limiting resistor (RT > 560 Ω for 5 V systems) in series with CT to prevent false triggering during rapid VCC slew-down. Without RT, internal charge redistribution may cause premature reset assertion unrelated to actual SENSE voltage drop.

What is the purpose of the REF pin on TL7702BCPG4?

The REF pin on TL7702BCPG4 delivers a precision 2.53 V ±50 mV temperature-compensated reference voltage. It must be decoupled with a 0.1 µF capacitor to ground to suppress noise and prevent false resets. This reference can also bias external analog circuitry - such as ADC references or sensor signal conditioning - improving overall system accuracy and reducing component count.