Texas Instruments TL7709AIP

Overview

TL7709AIP 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 reference (2.48–2.58 V), externally adjustable reset pulse duration via CT pin, open-collector RESET/RESET outputs, and operates across 3.5–18 V supply range. Used in TMS1XXXNLL-based embedded controllers requiring reliable power-on and undervoltage reset.

For engineers reviewing the TL7709AIP datasheet, TL7709AIP pinout, TL7709AIP application, or TL7709AIP equivalent, key selection criteria include its precise 7.6 V trip point, hysteresis of 20 mV, −40°C to +85°C industrial temperature grade, PDIP-8 package, and compatibility with 5–12 V system rails where stable reset timing and noise-immune sensing are critical.

Technical Context

The TL7709AIP integrates a precision voltage comparator with hysteresis, a temperature-stable bandgap reference, and an RC-based delay timer triggered upon SENSE input crossing V_IT−. Its dual active-high/active-low reset outputs (RESET and RESET) support both TTL and CMOS logic interfaces without external inverters.

During power-up, RESET remains low until V_CC exceeds ~3.6 V and SENSE rises above V_IT+, then initiates a programmable delay (e.g., 1.3 ms with 0.1 µF CT) before deasserting. On undervoltage, both outputs assert immediately and remain active until V_CC falls below 2 V, ensuring full system reset integrity.

Key Specifications

Pinout & Package

TL7709AIP uses an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. Pin spacing is 2.54 mm, compatible with standard 0.3-inch DIP sockets and PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7709ACD and TPS3808G33, the TL7709AIP uniquely combines through-hole PDIP packaging, precise 7.6 V threshold, and user-programmable reset delay-making it irreplaceable in legacy industrial designs where mechanical robustness and exact voltage matching are mandatory.

Availability

TL7709AIP is available at Aetrix Electronics and suitable for industrial automation, legacy embedded controller upgrades, and test equipment requiring stable component supply with long-lifecycle support and traceable sourcing.

Supply support for TL7709AIP 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 founded in 1930, specializing in analog, embedded processing, and power management ICs with broad industrial and automotive qualification.

The TL77xxA family was developed specifically as cost-effective, precision voltage supervisors for microcomputer reset control-emphasizing reliability, wide supply tolerance, and ease of integration in resource-constrained embedded systems.

FAQ

What is the exact undervoltage threshold voltage of the TL7709AIP?

The TL7709AIP has a guaranteed negative-going input threshold voltage (V_IT−) of 7.5 V minimum to 7.7 V maximum at 25°C, with typical value 7.6 V. This threshold applies to the SENSE pin and is used to detect supply droop. The device also provides 20 mV hysteresis to prevent oscillation near the trip point, and the threshold remains stable across the full −40°C to +85°C operating temperature range.

Can the TL7709AIP be used with a 12 V supply rail?

Yes, the TL7709AIP supports supply voltages from 3.5 V to 18 V, making it fully compatible with 12 V rails. Its SENSE input accepts up to 20 V, so a direct 12 V connection is permissible. For accurate 12 V monitoring, use a resistor divider to scale the input to match the 7.6 V threshold-e.g., 10 kΩ top / 6.8 kΩ bottom yields ~7.6 V at SENSE when V_IN = 12 V. The internal reference and comparator maintain accuracy across this range.

How is the reset pulse duration set on the TL7709AIP?

The reset pulse duration on the TL7709AIP is set by an external capacitor connected to the CT pin (Pin 3). The relationship is t_d ≈ 13,000 × C_T, where C_T is in farads and t_d is in seconds. A 0.1 µF capacitor yields approximately 1.3 ms delay. The capacitor must be low-leakage (e.g., ceramic or film) and placed close to the CT pin with short traces to minimize noise coupling and ensure timing accuracy.

Does the TL7709AIP provide both active-high and active-low reset outputs?

Yes, the TL7709AIP provides two complementary open-collector reset outputs: RESET (Pin 6, active-high) and RESET (Pin 5, active-low). Both outputs assert simultaneously during power-up or undervoltage events. Each requires an external pull-up resistor to the appropriate logic rail (e.g., 10 kΩ to 5 V or 3.3 V). This dual-output architecture eliminates the need for external inverters in mixed-logic systems.

Is the TL7709AIP RoHS compliant and lead-free?

Yes, the TL7709AIP is RoHS compliant and features lead-free terminations with NiPdAu (nickel-palladium-gold) or NIPDAU (nickel-palladium-gold) finish, as confirmed in Texas Instruments' official packaging addendum. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for through-hole packages (N/A for PDIP), and its Pb-free status is verified under TI's product change notifications dated 2016 and later.