Texas Instruments TLC7703ID

Overview

TLC7703ID from Texas Instruments is a micropower supply voltage supervisor IC designed for reset control in microcomputer and microprocessor systems. It features a fixed 2.63 V negative-going input threshold voltage at the SENSE pin, programmable delay time via external capacitor (td = 2.1 × 10⁴ × CT), defined RESET output down to VDD ≥ 1 V, and operates across 2 V to 6 V supply range with ≤16 µA supply current.

For engineers reviewing the TLC7703ID datasheet, TLC7703ID pinout, TLC7703ID application, or TLC7703ID equivalent, this device is selected for precision undervoltage monitoring, power-on reset generation, and battery-backed static RAM power-down control in space-constrained industrial and medical systems requiring stable low-power supervision.

Technical Context

The TLC7703ID implements a precision voltage sensor with temperature-compensated internal reference and built-in hysteresis (70 mV) to prevent oscillation during threshold crossing. Its internal timer ensures reliable system reset by holding RESET active until both SENSE voltage exceeds 2.63 V and the externally programmed delay td expires.

It supports dual-mode operation: when CONTROL is grounded, RESET asserts high; when CONTROL is tied to VDD, RESET remains active low during undervoltage events. This logic enables direct integration with chip-select lines of battery-backed SRAMs to disable memory access during power failure.

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 TLC7703QD, the TLC7703ID offers identical functionality at lower cost for commercial-temperature designs, while TPS3808G33 trades flexibility (programmable delay, dual outputs, SRAM control) for extreme low-power efficiency and fixed timing-making it suitable only where those features are unnecessary.

Availability

TLC7703ID is available at Aetrix Electronics and suitable for medical imaging power sequencing, industrial PLC controller supervision, and point-of-care diagnostic instrumentation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TLC7703ID 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and industrial ICs.

The TLC77xx family was designed specifically for micropower supply voltage supervision in microcomputer systems, emphasizing precision threshold stability, programmable timing, and integrated SRAM power-down control for mission-critical data retention.

FAQ

What is the exact SENSE threshold voltage for TLC7703ID?

The TLC7703ID has a fixed negative-going input threshold voltage (VIT–) of 2.63 V, specified over 2 V to 6 V supply range and –40°C to +85°C temperature. Electrical characteristics confirm min/typ/max values of 2.56 V / 2.63 V / 2.70 V, with 70 mV hysteresis to ensure noise immunity. This threshold is factory-trimmed and does not require external resistors.

How is the reset delay time set on TLC7703ID?

The reset delay time (td) on TLC7703ID is set by an external capacitor connected to the CT pin (pin 8 is NC; CT is internal node, not a pin). 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 td ≈ 2.1 ms. No external resistor is required-only the capacitor determines timing.

Does TLC7703ID support battery-backed SRAM power-down control?

Yes, TLC7703ID supports battery-backed SRAM power-down control via its CONTROL pin (pin 5). When CONTROL is grounded, RESET goes high-active-allowing direct connection to SRAM chip-select (CS) to disable memory during main power loss. The device must be powered from the backup battery in this configuration, as stated in the application information section of the datasheet.

What is the minimum supply voltage at which TLC7703ID asserts RESET?

TLC7703ID asserts RESET when VDD reaches 1 V, known as the power-up reset voltage (Vres). This is guaranteed across temperature and process variation, enabling reliable reset assertion even during very slow power ramps or brownout conditions where other supervisors may remain inactive. The specification is verified at IOL = 20 µA load.

Is TLC7703ID pin-compatible with other members of the TLC77xx family?

Yes, TLC7703ID is pin-compatible with TLC7701ID, TLC7725ID, TLC7733ID, and TLC7705ID in the SOIC-8 (D) package. All share identical pinout (VDD, SENSE, RESIN, GND, CONTROL, RESET, RESET, NC), allowing direct substitution when only the threshold voltage differs-e.g., replacing TLC7703ID (2.63 V) with TLC7733ID (2.93 V) requires no PCB change.