Texas Instruments TL7705BIDE4

Overview

TL7705BIDE4 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 negative-going threshold (V_IT–) at SENSE, true/complement active-high/active-low RESET outputs, and externally adjustable reset pulse duration via CT pin. Its operation is validated from –40°C to 85°C and supports stable reset assertion down to V_CC ≥ 1 V.

For engineers reviewing the TL7705BIDE4 datasheet, TL7705BIDE4 pinout, TL7705BIDE4 application, or TL7705BIDE4 equivalent, this page delivers verified electrical characteristics, thermal metrics, timing behavior, and design-critical layout guidance for undervoltage monitoring in industrial and computing systems.

Technical Context

The TL7705BIDE4 implements a precision bandgap-based voltage reference with ±0.5% typical threshold accuracy and temperature-compensated hysteresis of 30 mV. Its internal timing capacitor charging circuit delivers user-defined reset pulse widths (t_d ≈ 2.6×10⁴ × C_T), enabling robust fault response across varying supply slew rates.

RESET and RESET outputs are open-collector/open-drain compatible, requiring external pullup/pulldown resistors (TI recommends 10 kΩ). The RESIN input provides manual reset override capability, forcing RESET high and RESET low independently of SENSE voltage status.

Key Specifications

Pinout & Package

TL7705BIDE4 is housed in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and RoHS-compliant NiPdAu plating. It is rated MSL Level-2 (260°C, 1 year).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326UT46D3+T, TL7705BIDE4 uniquely combines 5-V-specific threshold accuracy, user-tunable reset timing, true/complement outputs, and a buffered reference-making it optimal for industrial 5-V microprocessor reset where flexibility and signal integrity are critical.

Availability

TL7705BIDE4 is available at Aetrix Electronics and suitable for industrial PLC control, server power management, factory automation HMI, network equipment power sequencing, and embedded computing applications requiring stable component supply across extended temperature ranges.

Supply support for TL7705BIDE4 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 delivering analog and embedded processing solutions, with decades of expertise in precision analog ICs and power management.

The TL77xxB family was developed specifically for robust, temperature-stable supply-voltage supervision in microprocessor-based systems-emphasizing threshold accuracy, noise immunity, and flexible reset timing for industrial and computing applications.

FAQ

What is the exact reset threshold voltage of TL7705BIDE4 at room temperature?

The TL7705BIDE4 has a nominal negative-going input threshold voltage (V_IT–) of 4.55 V at the SENSE pin when measured at TA = 25°C. Per the datasheet, the guaranteed range is 4.50 V to 4.60 V across the full operating temperature range of –40°C to +85°C, making TL7705BIDE4 suitable for precise 5-V rail monitoring.

How does the CT pin on TL7705BIDE4 determine reset pulse duration?

The CT pin on TL7705BIDE4 connects to an external capacitor that sets the reset pulse width using the formula t_d ≈ 2.6 × 10⁴ × C_T, where C_T is in farads and t_d is in seconds. For example, a 0.1-µF capacitor yields approximately 2.6 ms of reset assertion time after the SENSE voltage exceeds the threshold, ensuring reliable processor initialization in TL7705BIDE4-based designs.

Does TL7705BIDE4 require external pullup resistors on its RESET outputs?

Yes, TL7705BIDE4 requires external pullup and pulldown resistors because both RESET (pin 6) and RESET (pin 5) are open-collector outputs. Texas Instruments recommends 10-kΩ resistors for each: a pullup on RESET and a pulldown on RESET. This ensures clean, fast logic transitions and prevents waveform plateauing that could cause undefined states in the connected microcontroller's reset circuitry.

Can TL7705BIDE4 operate with supply voltages below 5 V?

Yes, TL7705BIDE4 operates over a supply range of 3.6 V to 18 V and guarantees functional reset generation down to V_CC ≥ 1 V. While its 4.55-V threshold targets 5-V systems, the device remains fully operational at lower V_CC levels-enabling use in brownout detection scenarios where the main rail collapses but residual power sustains TL7705BIDE4 functionality.

What is the purpose of the REF pin on TL7705BIDE4, and how should it be used?

The REF pin on TL7705BIDE4 provides a stable 2.53-V reference output (typical) with ±0.05-V tolerance, derived from an internal temperature-compensated bandgap. It must be decoupled with a 0.1-µF capacitor to ground to suppress noise and prevent false triggering. This reference can also serve as a precision bias source for external comparators or ADC references in TL7705BIDE4-based supervisory circuits.