Texas Instruments TL7709ACP

Overview

TL7709ACP from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in microprocessor systems operating at 7.6 V nominal supply. It features a fixed 7.6 V threshold (V_IT− = 7.5–7.7 V), temperature-compensated 2.53 V reference output, externally adjustable reset pulse duration via CT pin, and dual active-high/active-low open-collector RESET outputs. Used in industrial control units requiring reliable power-on and brownout reset.

For engineers reviewing the TL7709ACP datasheet, TL7709ACP pinout, TL7709ACP application, or TL7709ACP equivalent, this page delivers verified electrical specs, validated SOIC-8/PDIP-8 package mapping, confirmed timing behavior (1.2 ms typical pulse with 0.1 µF CT), and real-world implementation guidance for microcontroller reset circuitry.

Technical Context

The TL7709ACP integrates a precision voltage comparator with hysteresis (20 mV), a stable bandgap reference (±16 mV over –40°C to +85°C), and an RC-based delay timer whose output pulse width scales linearly with external capacitor CT (t_d = 1.3×10⁴ × C_T). Its SENSE input monitors system supply directly or via resistor divider.

It operates across 3.5 V to 18 V V_CC, asserts RESET when V_SENSE drops below 7.5 V (negative-going threshold), and holds reset active for ≥1.2 ms after recovery. Outputs remain defined down to V_CC = 2 V; below that, behavior is undefined.

Key Specifications

Pinout & Package

TL7709ACP uses an 8-pin PDIP package (9.81 mm × 6.35 mm) with through-hole mounting. Pin functions are electrically identical to SOIC-8 variants but differ mechanically in lead pitch and body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G12DBVR and MAX6805US29D3+T, the TL7709ACP provides fixed-accuracy 7.6 V supervision with integrated reference and dual-reset signaling-critical for 12 V industrial controllers where external component count and timing predictability are design priorities.

Availability

TL7709ACP is available at Aetrix Electronics and suitable for industrial automation, medical device manufacturing, and automotive electronics requiring stable component supply with long-term lifecycle assurance.

Supply support for TL7709ACP 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 specializing in analog and embedded processing technologies, with decades of leadership in power management and supervisory ICs.

The TL77xxA family was engineered for deterministic reset generation in microcomputer systems, emphasizing precision threshold accuracy, temperature stability, and flexible timing-targeting reliability-critical applications in computing and industrial control.

FAQ

What is the exact undervoltage threshold voltage of the TL7709ACP?

The TL7709ACP has a guaranteed negative-going input threshold voltage (V_IT−) of 7.5 V to 7.7 V at 25°C, with 20 mV hysteresis. This fixed 7.6 V nominal trip point is laser-trimmed during production and remains stable across temperature (±0.1 V from –40°C to +85°C). The TL7709ACP does not require external resistors to set this threshold-it is internally calibrated for direct 12 V rail monitoring.

How do I configure the reset pulse duration for the TL7709ACP?

Reset pulse duration on the TL7709ACP is set by connecting a capacitor between the CT pin (Pin 3) and GND. The relationship is t_d = 1.3 × 10⁴ × C_T, where C_T is in farads and t_d in seconds. For example, a 0.1 µF capacitor yields ~1.3 ms. The TL7709ACP datasheet specifies 0.65–2.6 ms typical range with 0.1 µF; always use a ceramic capacitor rated for ≥16 V.

Does the TL7709ACP provide both active-high and active-low reset outputs?

Yes, the TL7709ACP provides two complementary reset outputs: RESET (Pin 6, active-high open-collector) and RESET (Pin 5, active-low open-collector). Both are asserted simultaneously during undervoltage or manual reset. Each requires its own pull-up resistor-typically 4.7 kΩ to V_CC-to ensure proper logic levels for interfacing with microcontrollers or FPGAs.

Can the TL7709ACP monitor a supply voltage higher than its V_CC?

No-the TL7709ACP SENSE input must not exceed V_CC −1 V or 20 V, whichever is lower (per Absolute Maximum Ratings). To monitor a 24 V rail, use a resistor divider to scale the voltage to ≤17 V at SENSE while maintaining impedance compatibility. The TL7709ACP itself operates from 3.5–18 V V_CC; for 24 V systems, regulate V_CC to 12 V first.

Is the REF output on the TL7709ACP intended for external use?

Yes, the REF pin (Pin 1) delivers a precision 2.48–2.58 V temperature-compensated reference usable for external circuitry-such as ADC reference, sensor biasing, or comparator thresholds. A 0.1 µF ceramic capacitor to GND is mandatory per datasheet to suppress noise; the TL7709ACP REF output can source up to 100 µA with <10 mV load regulation error.