Texas Instruments TL7705BCP

Overview

TL7705BCP from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for 5-V microprocessor systems. It features a 4.55-V nominal undervoltage detection threshold (V_IT–), true/complement active-high and active-low RESET outputs, and externally adjustable reset pulse duration via the CT pin. It operates from 3.6 V to 18 V and guarantees defined RESET behavior down to V_CC ≥ 1 V - critical for reliable power-on initialization in industrial control units.

For engineers reviewing the TL7705BCP datasheet, TL7705BCP pinout, TL7705BCP application, or TL7705BCP equivalent, this page delivers verified functional identity, confirmed PDIP-8 package mapping, validated 8-pin terminal roles, exact threshold and timing specifications, and two rigorously cross-checked alternative parts - all extracted from TI's official SLVS037O datasheet and orderable addendum.

Technical Context

The TL7705BCP implements a precision bandgap-based voltage reference (2.53 V typ) with temperature compensation to stabilize its 4.55-V sensing threshold across 0°C to 70°C. Its dual-reset architecture provides simultaneous active-high (RESET) and active-low (RESET) signals, both open-collector, enabling direct interface with diverse microcontroller reset inputs without level-shifting.

Reset assertion is triggered when SENSE voltage falls below V_IT–; deassertion occurs after a user-defined delay set by an external capacitor on CT, governed by t_d ≈ 2.6 × 10⁴ × C_T. The RESIN pin allows external override of reset state, forcing RESET high and RESET low independently of supply conditions.

Key Specifications

Pinout & Package

TL7705BCP uses an 8-pin PDIP (Plastic Dual In-line Package) with body size 9.81 mm × 6.35 mm, RoHS-compliant NIPDAU lead finish, and through-hole mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7705BID and TPS3808G33DBVR, TL7705BCP uniquely combines PDIP-8 through-hole compatibility, 4.55-V threshold matched to 5-V systems, user-adjustable reset timing, and true/complement outputs - making it irreplaceable in legacy commercial-grade 5-V microcontroller reset applications requiring mechanical robustness and design flexibility.

Availability

TL7705BCP is available at Aetrix Electronics and suitable for industrial control systems, desktop computing platforms, set-top boxes, and factory automation terminals requiring stable component supply with long-term manufacturability assurance.

Supply support for TL7705BCP 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 connectivity technologies, with decades of expertise in power management and system supervision ICs.

The TL77xxB family - including TL7705BCP - was engineered specifically for robust, cost-effective reset control in commercial-grade microprocessor systems, emphasizing precision threshold accuracy, noise immunity, and flexible timing configuration.

FAQ

What is the exact undervoltage detection threshold voltage for TL7705BCP?

The TL7705BCP has a nominal negative-going input threshold voltage (V_IT–) of 4.55 V at 25°C, with a guaranteed range of 4.45 V to 4.65 V across its full 0°C to 70°C operating temperature range. This threshold is optimized for reliable supervision of standard 5-V power rails and is derived from an internal temperature-compensated voltage reference.

Does TL7705BCP support both active-high and active-low reset outputs simultaneously?

Yes, TL7705BCP provides true and complement reset outputs: pin 6 (RESET) is active-high and pin 5 (RESET) is active-low. Both are open-collector outputs, allowing independent pull-up or pull-down configuration to match host processor requirements - a key differentiator from single-output supervisors.

How is the reset pulse duration configured on TL7705BCP?

The reset pulse duration on TL7705BCP is set externally using a capacitor connected to the CT pin (pin 3). The delay follows t_d ≈ 2.6 × 10⁴ × C_T, where C_T is in farads. For example, a 0.1-µF capacitor yields approximately 2.6 ms. TI recommends a 10-kΩ pullup on RESET and matching termination on RESET to prevent waveform plateauing.

What package type and mounting style does TL7705BCP use?

TL7705BCP uses an 8-pin PDIP (Plastic Dual In-line Package) with through-hole mounting. Its body dimensions are 9.81 mm × 6.35 mm, and it features RoHS-compliant NIPDAU lead finish. This package is ideal for prototyping, legacy board designs, and applications requiring mechanical robustness and hand-soldering compatibility.

Can TL7705BCP operate with supply voltages below 5 V?

Yes, TL7705BCP operates from 3.6 V to 18 V and guarantees defined RESET output behavior down to V_CC ≥ 1 V. While its 4.55-V threshold targets 5-V systems, the wide supply range allows use in 3.3-V or mixed-rail designs where V_CC powers the IC and SENSE monitors a separate higher rail - provided V_CC stays within spec.