Texas Instruments TL7712ACDRE4

Overview

TL7712ACDRE4 from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in 12-V microprocessor and CMOS systems. It features a nominal 10.8-V threshold voltage (V_IT−), ±35-mV hysteresis, 0.65–2.6-ms externally adjustable reset pulse duration via CT capacitor, 2.5-V temperature-compensated reference output, and operates across 3.5–18-V supply range.

For engineers reviewing the TL7712ACDRE4 datasheet, TL7712ACDRE4 pinout, TL7712ACDRE4 application, or TL7712ACDRE4 equivalent, this device serves as a critical undervoltage detection and power-on reset generator in industrial embedded controllers, telecom power management, and legacy 12-V logic systems requiring stable, temperature-invariant reset timing.

Technical Context

The TL7712ACDRE4 implements a dual-threshold comparator with internal temperature-compensated bandgap reference to monitor SENSE input voltage against a fixed 10.8-V trip point (V_IT−). Its delay timer uses an external CT capacitor (e.g., 0.1 µF) to generate a precise reset pulse governed by t_d = 1.3 × 10⁴ × C_T.

It delivers complementary open-collector RESET and RESET outputs, supports RESIN override, and maintains defined behavior down to V_CC = 2 V before entering undefined state. The REF pin provides a stable 2.5-V reference usable for external circuitry, varying ≤16 mV over –40°C to +85°C.

Key Specifications

Pinout & Package

TL7712ACDRE4 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 peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7712ACP and TPS3808G12, TL7712ACDRE4 offers unique value in legacy 12-V systems requiring SOIC packaging, manual reset override, and a buffered 2.5-V reference - capabilities absent in both alternatives.

Availability

TL7712ACDRE4 is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom power sequencing, legacy instrumentation systems, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for TL7712ACDRE4 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability industrial and automotive components.

The TL77xxA family was engineered for robust reset control in microcomputer and microprocessor systems, targeting applications where precise undervoltage detection, temperature stability, and external timing flexibility are essential.

FAQ

What is the exact threshold voltage of TL7712ACDRE4 and how does it vary with temperature?

The TL7712ACDRE4 has a guaranteed negative-going input threshold voltage (V_IT−) of 10.6 V (min) to 11.0 V (max) at 25°C, with nominal 10.8 V. Over the full operating temperature range of 0°C to +70°C, the threshold drift is bounded by the 35-mV hysteresis specification and remains within datasheet limits; TI does not specify additional temperature coefficient beyond the hysteresis band. This ensures reliable 12-V rail monitoring without recalibration.

Can TL7712ACDRE4 be used to monitor a 5-V supply instead of 12 V?

No - TL7712ACDRE4 is factory-trimmed for a 10.8-V threshold and is not configurable for lower voltages. For 5-V supervision, TI specifies the TL7705A (4.55-V threshold). Using TL7712ACDRE4 on a 5-V rail would prevent reset assertion entirely, as the SENSE input never reaches its 10.6–11.0-V activation window. Select TL7705ACDRE4 or equivalent for 5-V applications.

Does TL7712ACDRE4 require external pull-up resistors on its RESET outputs?

Yes - both RESET (Pin 6) and RESET (Pin 5) are open-collector outputs and require external pull-up resistors to V_CC or another logic rail. Typical values are 4.7 kΩ to 10 kΩ. Without pull-ups, the outputs cannot drive a valid HIGH logic level, compromising reset signal integrity to the target microcontroller or FPGA.

What is the purpose of the REF pin on TL7712ACDRE4 and can it be left unconnected?

The REF pin delivers a precision 2.5-V temperature-compensated reference voltage usable for external circuitry such as ADC references or comparator biasing. It must not be left floating: a 0.1-µF ceramic capacitor to GND is mandatory per datasheet to suppress noise and prevent false triggering. Leaving REF unconnected or unterminated risks unstable operation and invalid reset behavior.

How does the CT capacitor affect reset timing in TL7712ACDRE4, and what value gives a 1-ms pulse?

The CT capacitor sets the reset pulse duration via t_d = 1.3 × 10⁴ × C_T (seconds). For a 1-ms pulse, solve: C_T = 1×10⁻³ / 1.3×10⁴ ≈ 77 nF. A standard 0.1-µF (100 nF) capacitor yields ~1.3 ms - the value used in TI's typical application. Use NP0/C0G ceramic capacitors for stability; avoid high-ESR or temperature-sensitive types.