Texas Instruments TLC7701QDR

Overview

TLC7701QDR from Texas Instruments is a micropower supply voltage supervisor IC with programmable reset delay, precision 1.1 V threshold sensing, and active-high RESET output. It operates from 2 V to 6 V supply, draws ≤16 µA quiescent current, and supports industrial temperature range (–40°C to 125°C) in SOIC-8 package. Used for power-on reset and undervoltage monitoring in microcontroller-based medical imaging systems.

For engineers reviewing the TLC7701QDR datasheet, TLC7701QDR pinout, TLC7701QDR application, or TLC7701QDR equivalent, key selection criteria include its adjustable delay via external capacitor, defined RESET assertion down to VDD ≥1 V, support for static RAM power-down control, and Q-grade automotive/industrial qualification.

Technical Context

The TLC7701QDR implements a precision voltage monitor with temperature-compensated reference and internal timer circuitry. Its SENSE input compares against a fixed 1.1 V threshold (VIT– = 1.1 V, hysteresis = 30 mV), triggering RESET when voltage drops below threshold and holding it active for programmable delay td = 2.1 × 10⁴ × CT seconds.

It features dual-output logic: RESET (active-high) and RESIN (active-low reset input), plus CONTROL pin enabling battery-backed SRAM disable during power failure. The device asserts RESET at power-up when VDD reaches 1 V and maintains defined output behavior across full operating temperature range.

Key Specifications

Pinout & Package

Package: SOIC-8 (D package), 3.91 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E29DBVR and TPS3808G12QDBVRQ1, the TLC7701QDR uniquely combines fixed 1.1 V sensing, programmable delay, SRAM power-down logic, and Q-grade temperature range in a standard SOIC-8 - making it optimal for medical and industrial systems requiring deterministic, low-power reset control without external components.

Availability

TLC7701QDR is available at Aetrix Electronics and suitable for medical imaging systems, industrial PLCs, battery-backed data loggers, and automotive telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC7701QDR 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 company delivering analog and embedded processing solutions for industrial, automotive, and medical applications.

The TLC77xx family was designed specifically for micropower supply voltage supervision in microcomputer and microprocessor systems, emphasizing ultra-low current, precision threshold stability, and integrated power-fail response logic.

FAQ

What is the exact threshold voltage of the TLC7701QDR?

The TLC7701QDR has a fixed negative-going input threshold voltage (VIT–) of 1.1 V, with guaranteed min/max values of 1.04 V and 1.16 V across temperature and supply voltage. This value applies specifically to the TLC7701 variant within the TLC77xx family and is confirmed in the Electrical Characteristics table of the SLVS087M datasheet.

How is the reset delay time set on the TLC7701QDR?

The reset delay time (td) of the TLC7701QDR is set externally using a capacitor (CT) connected between the CT pin and ground. The relationship is td = 2.1 × 10⁴ × CT seconds - for example, a 100 nF capacitor yields ~2.1 ms delay. No resistor is required, simplifying BOM and layout versus RC-based supervisors.

Does the TLC7701QDR support active-low reset output?

No, the TLC7701QDR provides only an active-high RESET output. Its complementary active-low output (RESET) is not implemented in this variant. For active-low reset functionality, designers must use external inversion or select another member of the TLC77xx family such as the TLC7703 or TLC7705, which offer dual outputs.

Can the TLC7701QDR be used to supervise a 1.8 V rail?

No - the TLC7701QDR's fixed 1.1 V threshold is not suitable for direct supervision of a 1.8 V rail. To monitor 1.8 V, a supervisor with ~1.76 V threshold (e.g., TLC7703 at 2.63 V is too high; TLV809E18DBVR at 1.78 V would be appropriate) should be selected instead. Using TLC7701QDR on 1.8 V would result in permanent reset assertion.

What is the function of the CONTROL pin on the TLC7701QDR?

The CONTROL pin on the TLC7701QDR enables SRAM power-down mode: when tied to GND, it configures the RESET output as active-high and activates internal logic to assist in disabling battery-backed static RAM during main power failure. This pin must be driven intentionally - floating or VDD-connected disables the SRAM control feature.