Texas Instruments TLC7733IP

Overview

TLC7733IP 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), and operates across 2 V to 6 V supply range with ≤16 µA supply current. Used in medical imaging power management where battery-backed static RAM retention is required.

For engineers reviewing the TLC7733IP datasheet, TLC7733IP pinout, TLC7733IP application, or TLC7733IP equivalent, this page delivers verified electrical specifications, DRB-package terminal mapping, temperature-compensated voltage reference behavior, and real-world use cases in undervoltage monitoring and power-down control for SRAM backup circuits.

Technical Context

The TLC7733IP implements a precision voltage sensor with internal temperature-compensated reference and hysteresis (70 mV) to prevent oscillation during threshold crossing. Its power-on reset generator asserts RESET when VDD reaches ≥1 V, then monitors SENSE voltage against 2.93 V threshold.

After minimum VDD (≥2 V) is established, the device maintains active RESET output while SENSE remains below threshold and enforces a user-defined delay (via external CT) before releasing RESET - ensuring reliable system initialization and recovery from brownout conditions.

Key Specifications

Pinout & Package

Package: 8-pin PDIP (Plastic Dual Inline Package), body width 0.300", standard through-hole mounting compatible with legacy PCB layouts and manual soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7733IPWR, the TLC7733IP offers through-hole manufacturability and legacy compatibility; versus TPS3808G33DBVR, it provides integrated SRAM power-down logic and totem-pole drive - critical for systems requiring simultaneous active-high/active-low reset signaling without external inverters.

Availability

TLC7733IP is available at Aetrix Electronics and suitable for medical imaging equipment, industrial PLCs, and battery-backed data loggers requiring stable component supply with long lifecycle support and traceable sourcing.

Supply support for TLC7733IP 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 and industrial-grade performance.

The TLC77xx family was designed specifically for micropower supply voltage supervision in microcomputer systems - prioritizing low quiescent current, precision threshold stability, and integrated power-down control for battery-backed memory.

FAQ

What is the exact SENSE input threshold voltage for TLC7733IP?

The TLC7733IP has a fixed negative-going input threshold voltage of 2.93 V at the SENSE pin, with ±70 mV hysteresis. This value is specified across the full operating temperature range (–40°C to 85°C) and supply voltage range (2 V to 6 V), and is internally trimmed for accuracy without external components. The TLC7733IP does not require resistor dividers or calibration to achieve this threshold.

How is the reset delay time set on TLC7733IP?

The reset delay time (td) on TLC7733IP is set externally using a capacitor 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 - yielding 2.1 ms with a 100 nF capacitor. This delay begins after SENSE voltage rises above threshold and ensures sufficient hold time before deasserting RESET. The TLC7733IP datasheet specifies 1.1 ms to 4.2 ms typical delay range depending on CT tolerance and temperature.

Does TLC7733IP support both active-high and active-low reset outputs?

Yes, TLC7733IP provides complementary reset outputs: RESET (active-low) and RESET (active-high), both implemented as totem-pole drivers capable of sourcing/sinking 2 mA. This eliminates the need for external inverters in systems requiring either polarity. The outputs are synchronized and share identical propagation delays, making TLC7733IP suitable for mixed-logic families and dual-reset architectures.

Can TLC7733IP be used to control static RAM during power failure?

Yes, TLC7733IP includes dedicated power-down control logic for static RAM with battery backup. When the CONTROL pin is tied to GND, RESET becomes active-high and can directly drive the chip select (CS) input of SRAM. During power loss, the TLC7733IP detects SENSE voltage drop, asserts RESET, and disables memory access - preserving data integrity. This function requires TLC7733IP to be powered from the backup battery during outage.

What is the minimum supply voltage at which TLC7733IP guarantees RESET assertion?

TLC7733IP guarantees RESET assertion when VDD reaches ≥1 V - known as the power-up reset voltage (Vres). This feature ensures early reset activation before digital logic becomes functional, preventing undefined states during power ramp-up. The specification holds across the full operating temperature range and is independent of SENSE voltage, making TLC7733IP suitable for systems with slow-ramping or poorly regulated supplies.