Analog Devices Inc./Maxim Integrated MAX792SCSE+

Overview

MAX792SCSE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line output 120mV above reset threshold), watchdog timer with pulsed fault warning (WDPO), and chip-enable gating for CMOS RAM protection. It operates from 2.75V to 5.5V, guarantees RESET validity down to VCC = 1V, and features 200ms reset timeout - used in industrial controllers and embedded systems requiring reliable brownout and software fault recovery.

For engineers reviewing the MAX792SCSE+ datasheet, MAX792SCSE+ pinout, MAX792SCSE+ application, or MAX792SCSE+ equivalent, this page delivers verified functional identity, exact pin roles, internal/external threshold programming modes, watchdog timeout configuration via SWT capacitor, CE gating timing (≤10ns propagation), and real-world design implications for reset sequencing, NMI assertion, and memory write-cycle completion.

Technical Context

The MAX792SCSE+ integrates five independent monitoring functions: a reset comparator with ±2% threshold accuracy (S-suffix = 2.91V nominal), a low-line comparator referenced to the same internal 1.30V bandgap, a watchdog timer with adjustable timeout (1.6s default, scalable via SWT capacitor), an overvoltage comparator (OVI/OVO), and a bidirectional chip-enable transmission gate. All comparators share a common precision reference and hysteresis (0.016 × V_TH).

It supports dual 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. The CE gate disables during reset to prevent memory corruption, with 15µs hold time if CE IN is low at reset assertion.

Key Specifications

Pinout & Package

MAX792SCSE+ is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm width, gull-wing leads, RoHS-compliant lead-free finish (+ suffix). Pin pitch: 0.050 inch (1.27mm). Thermal resistance θ_JA = 105°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX792SCSE+, MAX692ACSE+ offers higher reset accuracy and lower current but mismatches the 2.91V threshold requirement, while TPS3823DBVR reduces footprint and cost but removes four core functions (WDPO, CE gating, LOW LINE, dual reset), necessitating external components for equivalent capability.

Availability

MAX792SCSE+ is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for MAX792SCSE+ 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 demanding industrial, medical, and communications applications.

The MAX792SCSE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power-monitoring and fault-recovery in systems lacking battery backup - emphasizing deterministic reset timing, multi-level voltage warning, and memory protection under brownout.

FAQ

What is the exact reset threshold voltage for MAX792SCSE+?

The MAX792SCSE+ has a nominal reset threshold voltage of 2.91V, with ±2% accuracy over temperature and supply range. This value is factory-trimmed and applies in internal threshold mode (RESET IN/INT ≤60mV). In external programming mode, the threshold is set by an external resistor divider and is no longer fixed to 2.91V.

How does the low-line output (LOW LINE) relate to the reset threshold in MAX792SCSE+?

In internal threshold mode, the LOW LINE output asserts when VCC falls to 120mV above the reset threshold - so for MAX792SCSE+, LOW LINE triggers at approximately 3.03V. This provides a deterministic pre-reset warning signal, enabling the microprocessor to execute shutdown routines before full reset activation.

Can MAX792SCSE+ be used with a 3.3V microprocessor supply?

Yes, MAX792SCSE+ operates from 2.75V to 5.5V and supports 3.3V systems. Its 2.91V reset threshold is appropriate for monitoring 3.3V rails, and all outputs (RESET, WDO, WDPO, LOW LINE) are compatible with 3.3V logic levels. The CE gating function also works correctly at 3.3V with ≤10ns propagation delay.

What is the purpose of the WDPO pin on MAX792SCSE+ and how is it used?

The WDPO (Watchdog Pulse Output) pin on MAX792SCSE+ delivers a 500µs–6ms low-going pulse 70ns before WDO assertion, signaling imminent watchdog timeout. It is used to clock external logic (e.g., D flip-flop) that latches on the second consecutive WDPO pulse - enabling hardware-enforced shutdown after two failed software watchdog resets.

Does MAX792SCSE+ require external components to function in basic reset mode?

No - MAX792SCSE+ requires zero external components for basic reset operation in internal threshold mode: connect VCC, GND, RESET/RESET to µP, MR to pushbutton (or leave floating with internal pull-up), and LOW LINE to NMI. External capacitors or resistors are only needed for adjustable watchdog timeout (SWT-to-GND cap) or external threshold programming (resistor divider on RESET IN/INT and LLIN/REFOUT).