Texas Instruments TLC7733MJG

Overview

TLC7733MJG 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 –55°C to 125°C. It supports power-down control for static RAM with battery backup in medical imaging systems.

For engineers reviewing the TLC7733MJG datasheet, TLC7733MJG pinout, TLC7733MJG application, or TLC7733MJG equivalent, key selection criteria include its military-grade temperature range, precise undervoltage detection threshold, low 16 µA supply current, active-high RESET output when CONTROL is grounded, and compatibility with CDIP-8 packaging for high-reliability board-level integration.

Technical Context

The TLC7733MJG implements a precision voltage sensor with temperature-compensated internal reference and built-in 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 the 2.93 V threshold to maintain reset until both threshold recovery and programmable delay expiration occur.

It integrates logic for static RAM power-fail control: when CONTROL is tied to GND, RESET becomes active-high and can drive memory chip select (CS) while being synchronized to microprocessor bank select (CSH1), enabling automatic memory disable during brownout-provided TLC7733MJG itself is powered by backup battery.

Key Specifications

Pinout & Package

The TLC7733MJG is housed in an 8-pin Ceramic Dual-In-Line Package (CDIP, JG), hermetically sealed and rated for military temperature operation. This package provides high reliability, low leakage, and excellent thermal stability in demanding environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7733CJG and MAX691ACPP+, the TLC7733MJG uniquely delivers full military temperature qualification, ultra-low 16 µA quiescent current, and flexible RESET polarity control-making it the sole option for battery-backed, high-reliability embedded systems requiring guaranteed operation from –55°C to 125°C.

Availability

TLC7733MJG is available at Aetrix Electronics and suitable for medical imaging systems, aerospace avionics, and military communications radios requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC7733MJG 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 high-reliability, military-qualified components.

The TLC77xx family was engineered specifically for robust power-supply monitoring in mission-critical microcomputer systems-emphasizing low power, wide temperature operation, and integrated SRAM power-down control.

FAQ

What is the exact threshold voltage of the TLC7733MJG and how is it specified?

The TLC7733MJG has a fixed negative-going input threshold voltage of 2.93 V at the SENSE pin, with a typical tolerance of ±0.07 V (2.86 V to 3.00 V) over the full –55°C to 125°C operating range. This value is internally trimmed and temperature-compensated, and appears in the Electrical Characteristics table under "Negative-going input threshold voltage, VIT–" for the TLC7733 device grade. The TLC7733MJG inherits this specification directly as a member of the TLC7733 variant within the TLC77xx family.

Does the TLC7733MJG require an external capacitor to function, and what happens if it is omitted?

The TLC7733MJG does not require an external capacitor to assert RESET during power-on or undervoltage events-it will activate immediately upon VDD reaching 1 V or SENSE falling below 2.93 V. However, the external capacitor (CT) is mandatory to set the delay time (td) before RESET deasserts after recovery. If omitted, the internal timer defaults to minimum delay (~1.1 ms), which may be insufficient for reliable system reset in applications requiring longer hold times, such as FPGA configuration or flash memory write completion.

How does the CONTROL pin affect the RESET output polarity of the TLC7733MJG?

The CONTROL pin on the TLC7733MJG determines RESET output polarity: when CONTROL is tied to GND, RESET is active-high and RESET is active-low; when CONTROL is left open or connected to VDD, RESET becomes active-low and RESET becomes active-high. This dual-mode capability allows direct interface with either active-high or active-low reset inputs on microcontrollers or memory devices without external inverters-making the TLC7733MJG adaptable to diverse system architectures.

Is the TLC7733MJG RoHS compliant, and what is its lead finish?

The TLC7733MJG is not RoHS compliant, as confirmed in TI's Package Option Addendum: its lead finish is SNPB (tin-lead), and it carries a "No" designation under the RoHS column. This reflects its heritage as a military-grade CDIP (JG) package, where tin-lead solderability and long-term reliability under thermal cycling take precedence over lead-free compliance. Customers requiring RoHS compliance should evaluate modern alternatives like the TPS3839 series-but note these are not pin-compatible with TLC7733MJG.

Can the TLC7733MJG monitor voltages other than its nominal 2.93 V threshold, such as 5 V or 12 V rails?

The TLC7733MJG's internal threshold is fixed at 2.93 V and cannot be adjusted. To monitor higher rails (e.g., 5 V or 12 V), an external resistor divider must scale the target voltage down to ≤2.93 V at the SENSE pin. The divider must account for input bias current (≤15 µA), ensure stability with a 0.1 µF bypass capacitor, and maintain noise immunity-especially critical in high-voltage industrial settings. TI's application note SLVA211 details proper divider design for the TLC77xx family, including worst-case error analysis for the TLC7733MJG.