Texas Instruments TL7705ACPSR

Overview

TL7705ACPSR 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. It delivers dual active-high/active-low reset outputs (RESET and RESET) with open-collector configuration for TTL-compatible interfacing.

For engineers reviewing the TL7705ACPSR datasheet, TL7705ACPSR pinout, TL7705ACPSR application, or TL7705ACPSR equivalent, this device serves as a critical power-on and undervoltage reset controller in embedded microprocessor systems requiring stable 5-V supply monitoring, precise threshold triggering, and configurable reset timing without external logic.

Technical Context

The TL7705ACPSR integrates a temperature-compensated bandgap reference (2.53 V typ), a high-precision comparator with hysteresis, and an RC-based delay timer triggered upon SENSE input crossing V_IT−. Its dual open-collector outputs support flexible reset signaling-RESET asserts low during undervoltage, while RESET asserts high-enabling direct interface with both active-low and active-high reset inputs.

It functions within 0°C to 70°C ambient range and requires only three external components: 0.1 µF capacitor on REF for noise immunity, 0.1 µF capacitor on CT for timing, and pull-up resistors on RESET/RESET outputs. The SENSE input accepts up to 10 V, allowing direct connection to 5-V rails or scaled higher supplies.

Key Specifications

Pinout & Package

TL7705ACPSR uses an 8-pin SO (Small Outline) package with 6.20 mm × 5.30 mm body size, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating for unlimited reflow exposure at 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01QDBVRQ1 and MAX691CPD+, the TL7705ACPSR offers field-adjustable reset timing via CT, dual complementary outputs in a compact SO-8 package, and optimized cost/performance for commercial 5-V microcontroller systems-making it ideal where flexibility, simplicity, and footprint efficiency are prioritized.

Availability

TL7705ACPSR is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, 5-V embedded controller monitoring, multi-rail system coordination, and TTL-compatible reset distribution requiring stable component supply and long-term production continuity.

Supply support for TL7705ACPSR 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and broad application support.

The TL77xxA family was engineered specifically as cost-effective, precision supply-voltage supervisors for microcomputer and microprocessor reset control-targeting commercial and industrial systems where accurate undervoltage detection and configurable timing are essential.

FAQ

What is the exact threshold voltage of TL7705ACPSR and how tightly is it specified?

The TL7705ACPSR has a guaranteed negative-going input threshold voltage (V_IT−) of 4.55 V with a maximum deviation of ±0.05 V across 0°C to 70°C. This 1.1% tolerance ensures consistent reset activation across production units and temperature ranges, critical for reliable operation in 5-V systems where marginal supply droop must be detected without false triggering.

How does the CT pin determine reset pulse duration in TL7705ACPSR?

The CT pin sets reset pulse width via an external capacitor: t_d ≈ 1.3 × 10⁴ × C_T, where C_T is in farads and t_d in seconds. With a standard 0.1 µF capacitor, TL7705ACPSR delivers a typical 1.3 ms pulse-sufficient for most 5-V microprocessors to complete internal initialization before releasing reset.

Can TL7705ACPSR monitor voltages other than 5 V?

Yes. While optimized for 5-V systems, TL7705ACPSR's SENSE input accepts up to 10 V. For higher rails (e.g., 12 V), a resistor divider can scale the voltage down to stay within the 4.55 V threshold window-enabling flexible use across multiple supply domains without changing the supervisor IC.

What are the output configurations of TL7705ACPSR and how should they be interfaced?

TL7705ACPSR provides two open-collector outputs: RESET (active-low) and RESET (active-high). Each requires an external pull-up resistor-typically 4.7 kΩ to 10 kΩ-to the target logic rail. This configuration supports wired-OR reset buses and seamless interfacing with both TTL and CMOS inputs across mixed-signal systems.

Is TL7705ACPSR compatible with lead-free reflow processes?

Yes. TL7705ACPSR is RoHS-compliant with NiPdAu lead finish and rated MSL Level-1 (unlimited floor life), qualified for standard lead-free reflow profiles up to 260°C peak temperature. Its SO (PS) package meets IPC/JEDEC J-STD-020 requirements for surface-mount assembly in high-volume manufacturing.