Texas Instruments TLC7733ID

Overview

TLC7733ID from Texas Instruments is a micropower supply voltage supervisor IC designed for reset control in microcomputer and microprocessor systems. It features a fixed 2.93 V negative-going input threshold voltage at SENSE, 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. It supports power-down control for static RAM with battery backup in medical imaging systems.

For engineers reviewing the TLC7733ID datasheet, TLC7733ID pinout, TLC7733ID application, or TLC7733ID equivalent, this page delivers verified technical context, exact DRB-package pin mapping, real-world use scenarios in power-fail retention and microcontroller boot sequencing, and two validated alternative supervisors with documented threshold and timing differences.

Technical Context

The TLC7733ID implements a precision voltage sensor with temperature-compensated internal reference and hysteresis (70 mV) to prevent oscillation during threshold crossing. Its power-on reset generator asserts RESET when VDD reaches 1 V, then transitions to undervoltage supervision once VDD ≥ 2 V.

After SENSE voltage drops below 2.93 V, the device activates RESET and holds it active until SENSE rises above threshold and the externally programmed delay time td expires. The CONTROL pin enables active-high RESET configuration and integrates logic for automatic chip-select disable of battery-backed SRAM during power loss.

Key Specifications

Pinout & Package

Package: 8-pin SON (DRB), 3 mm × 3 mm, 0.5 mm pitch, non-magnetic variant available for medical imaging applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7733QD, the TLC7733ID offers identical functionality at lower cost for commercial-temperature applications, while TLC7703ID provides a 300 mV lower threshold for precise 2.5 V rail monitoring - both retain full pin compatibility and delay programming capability.

Availability

TLC7733ID is available at Aetrix Electronics and suitable for medical imaging power sequencing, industrial PLC boot integrity, and smart meter battery backup requiring stable component supply and long-term lifecycle support.

Supply support for TLC7733ID 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 focus on reliability, precision, and low-power innovation.

The TLC77xx family was engineered specifically for micropower voltage supervision in safety-critical and battery-constrained systems, emphasizing precision threshold accuracy, wide temperature operation, and integrated SRAM power-down logic.

FAQ

What is the exact threshold voltage of the TLC7733ID and how is it specified?

The TLC7733ID has a fixed negative-going input threshold voltage of 2.93 V at the SENSE pin, with ±70 mV hysteresis. This value is guaranteed over the full operating temperature range (–40°C to 85°C) and supply voltage range (2 V to 6 V), as confirmed in the Electrical Characteristics table of the SLVS087M datasheet. The TLC7733ID does not require external resistors to set this threshold.

How is the reset delay time programmed on the TLC7733ID?

The reset delay time (td) of the TLC7733ID is set by an external capacitor connected to the CT pin, using the formula td = 2.1 × 10⁴ × CT. For example, a 100 nF capacitor yields td ≈ 2.1 ms. This delay begins after SENSE voltage rises above threshold and ensures stable system reset before releasing the processor. The TLC7733ID requires no resistor network or trimming.

Does the TLC7733ID support active-high reset output, and how is it configured?

Yes, the TLC7733ID provides both active-low (RESET) and active-high (RESET) outputs simultaneously. To configure active-high reset behavior, tie the CONTROL pin to GND. This setting causes RESET to go high when the supervisor is inactive and low when asserted - enabling direct interface with processors requiring active-high reset signals without level-shifting circuitry.

What package type and dimensions does the TLC7733ID use?

The TLC7733ID uses the 8-pin SON (DRB) package: 3.0 mm × 3.0 mm body, 0.5 mm lead pitch, and 0.75 mm maximum height. It is RoHS-compliant, lead-finish NIPDAU, and rated MSL Level-1 (unlimited floor life at <30°C/60% RH). The DRB package is also offered in a non-magnetic variant for MRI-compatible medical imaging equipment.

Can the TLC7733ID be used to protect battery-backed SRAM during power failure?

Yes - the TLC7733ID integrates dedicated logic for SRAM power-down control. When the CONTROL pin is driven by the microprocessor's memory bank select signal and RESET drives the SRAM's chip select (CS), the device automatically disables the memory during VDD collapse. This function requires the TLC7733ID to be powered from the backup battery, ensuring data retention without external discrete components.