Analog Devices Inc./Maxim Integrated MAX792TCSE+

Overview

MAX792TCSE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line detection), watchdog timer with pulse output, and chip-enable signal gating for nonvolatile memory protection. It features a 2.91V internal reset threshold, guaranteed RESET validity down to VCC = 1V, and 200ms reset timeout delay. Used in embedded controllers and intelligent instruments requiring reliable power monitoring.

For engineers reviewing the MAX792TCSE+ datasheet, MAX792TCSE+ pinout, MAX792TCSE+ application, or MAX792TCSE+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior (200ms reset delay, 1.6s default watchdog timeout), real-world memory write-cycle completion support, and validated alternatives for critical µP power supervision designs.

Technical Context

The MAX792TCSE+ integrates independent reset, low-line, overvoltage, and watchdog comparators with internal 1.30V reference and programmable thresholds. Its dual reset outputs (RESET and RESET) operate with guaranteed functionality at VCC ≥ 1V, while the CE transmission gate enforces ≤10ns propagation delay and automatic write-cycle completion during power-down.

It supports two operating modes: internal threshold mode (RESET IN/INT ≤ 60mV) using factory-trimmed 2.91V reset and 3.03V low-line thresholds, and external programming mode (RESET IN/INT ≥ 600mV) enabling user-defined thresholds via resistor dividers. Watchdog timeout is set by capacitor on SWT pin (k = 16.2 for VCC = 5V) or fixed at 1.6s when SWT = VCC.

Key Specifications

Pinout & Package

MAX792TCSE+ is housed in a 16-pin narrow SOIC (SO) package, 3.9mm width, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX792TCSE+, MAX792SCSE+ offers identical functionality at a higher reset threshold ideal for 3.3V systems, while TPS3808G33DBVR reduces cost and footprint but sacrifices low-line warning, CE gating, and watchdog pulse capability essential for robust memory supervision.

Availability

MAX792TCSE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX792TCSE+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX792TCSE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to provide comprehensive power monitoring, reset control, memory protection, and watchdog supervision for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX792TCSE+?

The MAX792TCSE+ has a nominal reset threshold voltage of 2.91V, specified with ±2.5% accuracy over the 0°C to +70°C operating temperature range. This value is factory-trimmed and applies in internal threshold mode when RESET IN/INT is grounded. The low-line threshold is correspondingly 3.03V (120mV above reset). These values are confirmed in the Electrical Characteristics table of the official MAX792/MAX820 datasheet Rev. 4.

Does the MAX792TCSE+ support external reset threshold programming?

Yes, the MAX792TCSE+ supports external programming mode. When RESET IN/INT is biased ≥600mV (e.g., via resistor divider), the internal voltage divider disconnects and both reset and low-line comparators accept external thresholds through LLIN/REFOUT and RESET IN/INT pins. The MAX792TCSE+ datasheet provides equations and examples for calculating R1–R3 to achieve custom thresholds such as 4.4V reset and 4.75V low-line.

How does the chip-enable gating function work on the MAX792TCSE+?

The MAX792TCSE+ integrates a transmission gate between CE IN and CE OUT. During normal operation, CE signals pass with ≤10ns delay. When reset is asserted, CE OUT is held low for 15µs if CE IN was low - ensuring memory write-cycle completion. CE IN becomes high-impedance during reset, preventing back-driving. This function is fully implemented in silicon and requires no external components.

What is the purpose of the WDPO pin on the MAX792TCSE+?

The WDPO (Watchdog Pulse Output) pin on the MAX792TCSE+ delivers a 500µs–6ms low-going pulse 70ns before WDO asserts, providing advance warning of impending watchdog timeout. This enables external logic (e.g., D flip-flop) to initiate controlled shutdown sequences. Unlike WDO, WDPO is not latched - it pulses once per timeout event, making it ideal for triggering timed responses without requiring additional debouncing circuitry.

Can the MAX792TCSE+ operate reliably below 2.75V supply voltage?

The MAX792TCSE+ specifies a minimum operating voltage of 2.75V, but its RESET output is explicitly guaranteed functional down to VCC = 1V. Below 2.75V, internal comparators and timers may cease operation, yet the reset latch remains active and RESET retains valid logic levels (e.g., sinking 1.6mA at 0.1V). This ensures fail-safe reset assertion during deep brownout conditions where other supervisors would release reset prematurely.