Texas Instruments TL7702BCDRE4

Overview

TL7702BCDRE4 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, 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 TL7702BCDRE4 datasheet, TL7702BCDRE4 pinout, TL7702BCDRE4 application, or TL7702BCDRE4 equivalent, key selection considerations include its adjustable reset pulse duration via external CT capacitor, dual active-high/active-low reset outputs, precise 2.53 V threshold with 10 mV hysteresis, SOIC-8 package compatibility, and operation across 0°C to 70°C ambient.

Technical Context

The TL7702BCDRE4 implements a precision bandgap-based voltage reference and comparator architecture to detect undervoltage at the SENSE pin. Its internal timing capacitor (CT) interface enables user-defined reset pulse width (td ≈ 2.6 × 10⁴ × CT), while RESIN allows external reset assertion independent of supply monitoring.

It delivers complementary open-collector outputs: RESET (active-high) and RESET (active-low), both specified for ±16 mA drive strength. The device operates over 3.6 V–18 V VCC and maintains valid reset output states even when VCC drops to 1 V, ensuring robust power-on and brownout detection in microcontroller-based systems.

Key Specifications

Pinout & Package

TL7702BCDRE4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1 (260°C, unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7702BCDRE4, TPS3808G12DBVR offers superior power efficiency but sacrifices design flexibility in timing and output configuration, while MAX6816EUT+T provides higher ESD immunity at the expense of missing key features like reference output and external reset override.

Availability

TL7702BCDRE4 is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, smart building control, and point-of-sale terminal designs requiring stable component supply across extended production lifecycles.

Supply support for TL7702BCDRE4 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 and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontroller technologies.

The TL77xxB family was engineered specifically for robust, precision supply-voltage supervision in microprocessor and microcontroller systems - emphasizing threshold accuracy, temperature stability, and flexible reset signaling for mission-critical embedded applications.

FAQ

What is the exact undervoltage threshold voltage of the TL7702BCDRE4?

The TL7702BCDRE4 has a nominal negative-going input threshold voltage (V_IT−) of 2.53 V at 25°C, with a tolerance of ±25 mV over temperature. This value is specified in the Electrical Characteristics table of the SLVS037O datasheet and applies directly to the TL7702BCDRE4 variant, enabling precise supervision of 3.3 V power rails with adequate margin.

Does the TL7702BCDRE4 support adjustable reset pulse duration, and how is it configured?

Yes, the TL7702BCDRE4 supports user-adjustable reset pulse duration via the external capacitor connected to the CT pin. The delay time follows td ≈ 2.6 × 10⁴ × CT (seconds), where CT is in farads. For example, a 0.1 µF capacitor yields ~2.6 ms delay. This configuration is confirmed in Section 8.3.2 and Figure 9-1 of the official TI datasheet for TL7702BCDRE4.

What are the output types and drive capabilities of TL7702BCDRE4's RESET and RESET pins?

Both RESET and RESET pins on the TL7702BCDRE4 are open-collector outputs, each rated for ±16 mA sink/source current. RESET is active-high and RESET is active-low, providing complementary reset signaling. External pullup (for RESET) and pulldown (for RESET) resistors are required - TI recommends 10 kΩ values per Section 9.2.1 of the TL7702BCDRE4 datasheet.

Can the TL7702BCDRE4 operate with supply voltages below 3.3 V?

Yes, the TL7702BCDRE4 guarantees defined reset output behavior down to V_CC ≥ 1 V, though its recommended operating range is 3.6 V to 18 V. Below 3.6 V, internal circuitry remains functional for brownout detection, but performance parameters such as propagation delay and reference accuracy are not characterized - this behavior is explicitly stated in the Features and Description sections of the TL7702BCDRE4 datasheet.

Is the REF pin on TL7702BCDRE4 intended for external circuit use, and what is its output specification?

Yes, the REF pin on TL7702BCDRE4 provides a buffered 2.53 V ±50 mV reference voltage over the full 0°C to 70°C operating range, with ±500 µA load capability. It is designed for external use - e.g., as ADC reference or comparator input - and requires a 0.1 µF bypass capacitor to ground per TI layout guidelines in Section 11.1 of the TL7702BCDRE4 datasheet.