Texas Instruments TL7705BIP

Overview

TL7705BIP from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for 5-V microprocessor systems. It monitors the SENSE input for undervoltage conditions, provides true and complement active-high/active-low RESET outputs, features a temperature-compensated 4.55-V threshold (±50 mV), supports adjustable reset pulse duration via external CT capacitor, and operates across –40°C to +85°C.

For engineers reviewing the TL7705BIP datasheet, TL7705BIP pinout, TL7705BIP application, or TL7705BIP equivalent, this page delivers verified functional identity, confirmed SOIC/PDIP package mapping, validated 8-pin terminal roles, exact electrical thresholds, timing behavior under VCC slew, and real-world implementation constraints including CT resistor mitigation for false triggering.

Technical Context

The TL7705BIP implements a dual-comparator architecture with precision bandgap reference and hysteresis (30 mV typical) to detect SENSE voltage drops below 4.55 V. Its internal current source charges the external CT capacitor to generate a user-defined reset pulse duration (td ≈ 26 × CT in µF → ms), while RESIN enables manual reset override independent of supply monitoring.

RESET and RESET outputs are open-collector/open-drain compatible, requiring external pullup/pulldown resistors (TI recommends 10 kΩ). The REF pin supplies a stable 2.53 V ±50 mV reference for decoupling and noise immunity, and the device remains functional down to VCC ≥ 1 V for reliable power-on reset assertion.

Key Specifications

Pinout & Package

TL7705BIP is available in PDIP-8 (plastic dual in-line package), 9.81 mm × 6.35 mm body size, through-hole mountable with 2.54 mm lead pitch. Pin 1 is bottom-left corner when notch faces up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7705BID and TPS3808G33, the TL7705BIP uniquely combines 5-V precision supervision, true/complement outputs, CT-based pulse tuning, and industrial-temperature PDIP packaging-making it non-substitutable in legacy through-hole or dual-signal reset architectures.

Availability

TL7705BIP is available at Aetrix Electronics and suitable for industrial automation, factory control systems, and embedded computing applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TL7705BIP 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 heritage in precision analog IC design.

The TL77xxB series was developed specifically for robust, hardware-based reset control in microprocessor systems-emphasizing threshold accuracy, noise immunity, and flexible timing without software overhead.

FAQ

What is the exact undervoltage threshold voltage for TL7705BIP?

The TL7705BIP has a nominal negative-going input threshold voltage (V_IT–) of 4.55 V, with guaranteed limits of 4.45 V (min) and 4.65 V (max) across its full operating temperature range of –40°C to +85°C. This threshold is internally trimmed and temperature-compensated using a precision bandgap reference, ensuring consistent 5-V rail supervision performance in industrial environments.

Does TL7705BIP require external components to function correctly?

Yes, TL7705BIP requires three external components for reliable operation: a 0.1 µF capacitor from REF to GND for reference stabilization, a timing capacitor (e.g., 0.1 µF) from CT to GND to set reset pulse duration, and pullup/pulldown resistors (TI recommends 10 kΩ) on RESET and RESET outputs respectively. Omitting the REF capacitor risks false triggering due to supply noise.

Can TL7705BIP monitor a 12-V supply directly?

Yes, TL7705BIP can monitor a 12-V supply directly at the SENSE pin, as its absolute maximum SENSE input voltage is 20 V and recommended operating range extends to 18 V. However, the 4.55-V threshold means it will only detect undervoltage relative to that level-not 12-V-specific faults. For 12-V supervision, use a resistor divider to scale the input to match the 4.55-V threshold.

What is the purpose of the RESIN pin on TL7705BIP?

The RESIN pin on TL7705BIP is an active-low manual reset input. When pulled low, it forces RESET high and RESET low immediately-overriding the SENSE-based voltage monitoring. This allows external controllers (e.g., FPGA, watchdog timer, or front-panel button) to initiate a system reset independently of supply conditions, providing critical debug and recovery capability.

How does the CT capacitor affect reset timing in TL7705BIP?

The CT capacitor on TL7705BIP sets the reset pulse duration using an internal current source: t_d ≈ 26 × C_T (with C_T in µF yielding t_d in ms). For example, a 0.1 µF capacitor produces ~2.6 ms of reset assertion after VSENSE recovers above threshold. TI warns that fast VCC slew rates may cause false triggering unless a series resistor (≥560 Ω) is added between CT and VCC.