Texas Instruments TLC7703IDR

Overview

TLC7703IDR from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.63 V sense threshold, active-low RESET output, programmable delay via external capacitor, and operation across –40°C to 85°C. It provides power-on reset generation, undervoltage supervision, and power-down control for static RAM with battery backup in microprocessor systems.

For engineers reviewing the TLC7703IDR datasheet, TLC7703IDR pinout, TLC7703IDR application, or TLC7703IDR equivalent, this device supports critical reset timing integrity in low-power embedded controllers, medical imaging subsystems, and industrial microcomputer power management where supply stability below 2.63 V must trigger reliable system reset.

Technical Context

The TLC7703IDR integrates a precision temperature-compensated voltage reference, internal timer for reset delay (td = 2.1 × 10⁴ × CT), and totem-pole output stage capable of sinking 2 mA at 0.5 V. Its SENSE input monitors supply rail voltage relative to a fixed 2.63 V threshold with 70 mV hysteresis to prevent chatter during brownout recovery.

RESET assertion occurs when VDD reaches ≥1 V at power-up, and remains active as long as SENSE voltage stays below threshold plus hysteresis-then holds for td after SENSE rises above threshold. CONTROL pin enables active-high RESET mode for memory power-down coordination in battery-backed SRAM applications.

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 TLV803EC26DBVR and TPS3808G33DBVR, the TLC7703IDR uniquely combines programmable delay, dual RESET outputs, and dedicated CONTROL logic for SRAM power-down-making it irreplaceable in designs requiring coordinated memory retention during supply interruption.

Availability

TLC7703IDR is available at Aetrix Electronics and suitable for medical imaging subsystems, industrial microcontroller reset circuits, and battery-backed data loggers requiring stable component supply with long-term lifecycle assurance.

Supply support for TLC7703IDR 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 with leadership in power management, signal chain, and microcontrollers.

The TLC77xx family was designed specifically for micropower voltage supervision in resource-constrained microcomputer systems-emphasizing ultra-low current, precision thresholds, and integrated power-down control for battery-backed memory.

FAQ

What is the exact sense threshold voltage for TLC7703IDR?

The TLC7703IDR has a fixed negative-going input threshold voltage (VIT–) of 2.63 V, with a tolerance of ±70 mV over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed and does not require external resistor configuration, making it ideal for stable 3.3 V rail monitoring in the TLC7703IDR application.

How is the reset delay time set for TLC7703IDR?

The reset delay time (td) for TLC7703IDR is set externally using a capacitor (CT) connected between the CT pin and ground. The relationship is td = 2.1 × 10⁴ × CT, where CT is in farads and td is in seconds. For example, a 100 nF capacitor yields a nominal delay of 2.1 ms-enabling precise, adjustable timing without additional ICs or firmware overhead in the TLC7703IDR design.

Does TLC7703IDR support active-high reset output?

Yes, the TLC7703IDR supports active-high RESET output via the CONTROL pin: when CONTROL is tied to GND, the RESET pin (Pin 4) becomes active-high while RESET (Pin 8) remains active-low. This dual-output capability allows direct interface with processors requiring either polarity, and is explicitly documented in the TLC7703IDR functional block diagram and timing tables.

What is the maximum supply current for TLC7703IDR?

The maximum supply current for TLC7703IDR is 16 µA at VDD = 5 V and TA = 85°C, with typical current of 9 µA at 25°C. This micropower consumption is guaranteed across the full operating range and enables multi-year battery operation in always-on sensing applications using the TLC7703IDR.

Can TLC7703IDR be used for battery-backed SRAM power-down control?

Yes, the TLC7703IDR includes dedicated logic for battery-backed SRAM power-down control. When CONTROL is driven by the microprocessor's memory bank select signal and RESET drives the SRAM chip select, the TLC7703IDR automatically disables the memory during power failure-provided the TLC7703IDR itself is powered from the backup battery. This function is verified in Figure 10 of the TLC7703IDR datasheet.