Texas Instruments TL7705AIP

Overview

TL7705AIP from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in 5-V microcomputer systems. It features a 4.55-V ±0.05-V threshold voltage (V_IT−), 15-mV hysteresis, externally adjustable reset pulse duration via CT pin (e.g., 1.3 ms with 0.1 µF), and dual active-high/active-low open-collector RESET outputs. It operates across 3.5 V to 18 V supply range and supports industrial temperature range (–40°C to +85°C).

For engineers reviewing the TL7705AIP datasheet, TL7705AIP pinout, TL7705AIP application, or TL7705AIP equivalent, this page delivers verified functional specifications, validated pin functions, confirmed reset timing behavior, and real-world implementation guidance for reliable power-on and undervoltage reset generation in embedded microprocessor systems.

Technical Context

The TL7705AIP integrates a precision bandgap reference (2.53 V typ), a comparator with temperature-compensated trip point, and an RC-based delay timer triggered upon SENSE input crossing V_IT−. Its dual-reset outputs (RESET and RESET) provide complementary signals for systems requiring both assertion polarities without external inversion.

It monitors the SENSE input - which may be tied directly to V_CC or scaled via resistor divider - and asserts reset when voltage falls below 4.55 V. After recovery, it holds reset active for a programmable delay (determined by CT capacitor) before deassertion, ensuring stable processor initialization.

Key Specifications

Pinout & Package

TL7705AIP is housed in an 8-pin PDIP package (9.81 mm × 6.35 mm), through-hole mountable with standard 0.3-inch DIP footprint. Pin spacing conforms to JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G15DBVR and MAX692CPA+, the TL7705AIP offers precise 4.55-V detection optimized for TTL-compatible 5-V systems, user-adjustable reset timing via external capacitor, and dual complementary outputs - making it uniquely suited for legacy and cost-sensitive microcontroller reset applications where design flexibility and component count matter.

Availability

TL7705AIP is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller systems, and legacy TTL equipment requiring stable component supply with long-term lifecycle support.

Supply support for TL7705AIP 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and microcontrollers.

The TL77xxA family was developed specifically as cost-effective, precision supply-voltage supervisors for microcomputer and microprocessor reset control - emphasizing robustness, wide operating range, and ease of integration in industrial and computing applications.

FAQ

What is the exact reset threshold voltage of the TL7705AIP?

The TL7705AIP has a nominal negative-going input threshold voltage (V_IT−) of 4.55 V, with a tolerance of ±0.05 V over the full industrial temperature range (–40°C to +85°C). This value is specified in the Electrical Characteristics table of the SLVS028K datasheet and is trimmed at wafer test to ensure consistency across units. The TL7705AIP uses this threshold to detect undervoltage conditions on the SENSE pin and initiate reset assertion.

Does the TL7705AIP require external pull-up resistors on its RESET outputs?

Yes, the TL7705AIP features open-collector RESET and RESET outputs, which require external pull-up resistors to define high-state voltage levels. Typical values are 4.7 kΩ to 10 kΩ connected between V_CC and each output. Without pull-ups, the outputs remain floating when inactive, risking undefined logic states in downstream circuitry. This design allows flexible interfacing with different logic families and voltage domains.

Can the TL7705AIP monitor voltages other than 5 V?

Yes - while optimized for 5-V systems, the TL7705AIP can supervise any supply between 3.5 V and 18 V by scaling the input voltage with a resistor divider at the SENSE pin. For example, a 12-V rail can be monitored using a 2:1 divider to present 6 V to SENSE, triggering reset when scaled voltage drops below 4.55 V (i.e., actual rail < 9.1 V). The device's wide input range and precision reference make such adaptations reliable and repeatable.

How is the reset pulse duration set on the TL7705AIP?

The reset pulse duration is set by an external capacitor connected to the CT pin (Pin 3). The relationship is t_d ≈ 1.3 × 10⁴ × C_T, where C_T is in farads and t_d is in seconds. A 0.1 µF capacitor yields approximately 1.3 ms - sufficient for most microcontroller power-on sequences. This external timing element avoids factory programming constraints and allows field tuning without component replacement.

Is the TL7705AIP RoHS-compliant and lead-free?

Yes, the TL7705AIP is RoHS-compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Packaging Information addendum (SLVS028K, July 2026). It meets JEDEC J-STD-020 moisture sensitivity Level-1 requirements for through-hole PDIP packaging and carries full exemption documentation for industrial use. All active orderable variants, including TL7705AIP, are lead-free and halogen-free per TI's environmental compliance policy.