Texas Instruments TL7705ACDR

Overview

TL7705ACDR 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 operates across 3.5 V to 18 V supply range. Used in TTL-compatible systems like TMS7000-based controllers to ensure reliable power-on and brownout reset.

For engineers reviewing the TL7705ACDR datasheet, TL7705ACDR pinout, TL7705ACDR application, or TL7705ACDR equivalent, key selection criteria include its fixed 4.55 V sensing threshold, dual active-high/active-low open-collector RESET outputs, SOIC-8 package compatibility, and temperature-stable reference (±16 mV over –40°C to +85°C).

Technical Context

The TL7705ACDR implements a precision bandgap-based voltage reference and comparator architecture to monitor the SENSE input against a trimmed 4.55 V threshold. Its internal delay timer-controlled by external capacitor CT-generates a programmable reset pulse after power-up or undervoltage recovery.

It delivers complementary reset signals (RESET high-active, RESET low-active) with open-collector outputs rated for ±16 mA, supports wide operating temperature (0°C to 70°C), and maintains stable operation across V_CC = 3.5–18 V while consuming only 1.8–3 mA quiescent current.

Key Specifications

Pinout & Package

TL7705ACDR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, RoHS-compliant, with NIPDAU lead finish and moisture sensitivity level (MSL) 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G15DBVR and MAX691CPD+, the TL7705ACDR provides fixed-precision 4.55 V supervision with dual complementary outputs in a compact SOIC-8 package-ideal for cost-sensitive, space-constrained 5-V microcontroller systems where simplicity and proven reliability outweigh programmability or ultra-low power needs.

Availability

TL7705ACDR is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, industrial PLC controller reset, legacy TTL system compatibility, and multi-rail power monitoring requiring stable component supply and long-lifecycle support.

Supply support for TL7705ACDR 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 TL77xxA family-including TL7705ACDR-is engineered specifically for robust, low-cost reset control in microcomputer and microprocessor systems, emphasizing accuracy, hysteresis stability, and ease of integration in industrial and computing applications.

FAQ

What is the exact reset threshold voltage of the TL7705ACDR?

The TL7705ACDR has a nominal negative-going input threshold voltage (V_IT−) of 4.55 V, with a tolerance of ±0.05 V at 25°C. This value is factory-trimmed and remains stable across temperature and supply variations, making it ideal for precise 5-V system supervision. The TL7705ACDR's threshold is optimized for TTL-compatible logic levels and matches the TMS7000 microcontroller family requirements.

Does the TL7705ACDR support both active-high and active-low reset outputs?

Yes, the TL7705ACDR provides two complementary open-collector reset outputs: RESET (Pin 6, active-high) and RESET (Pin 5, active-low). Both are rated for ±16 mA drive capability and require external pull-up resistors. This dual-output configuration allows direct interface with microcontrollers that accept either polarity reset signal-no additional logic inversion is needed when using the TL7705ACDR.

How is the reset pulse duration set on the TL7705ACDR?

The reset pulse duration on the TL7705ACDR is set externally via capacitor CT connected to Pin 3. The relationship is t_d ≈ 1.3 × 10⁴ × C_T, where C_T is in farads and t_d in seconds. Using a 0.1 µF capacitor yields ~1.3 ms delay-sufficient for most 5-V microprocessors. The TL7705ACDR does not require trimming or calibration; timing accuracy depends solely on capacitor tolerance and temperature stability.

Can the TL7705ACDR monitor a supply other than 5 V?

Yes-the TL7705ACDR can monitor any supply between 3.5 V and 18 V, but its internal 4.55 V threshold is fixed. To supervise higher rails (e.g., 12 V), connect the SENSE pin through a resistor divider that scales the voltage down to 4.55 V at threshold. The TL7705ACDR's wide V_CC range (3.5–18 V) and robust input rating (–0.3 V to 20 V on SENSE) support this configuration without additional protection components.

What package and environmental specifications apply to the TL7705ACDR?

The TL7705ACDR is supplied in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), RoHS-compliant, with NIPDAU lead finish and MSL Level-1 (unlimited floor life at ≤30°C/60% RH). It is rated for 0°C to 70°C operating temperature and supports reflow soldering up to 260°C peak. This package enables high-density PCB layouts and automated assembly-key for production-scale deployment of the TL7705ACDR.