Analog Devices Inc./Maxim Integrated MAX792MEPE

Overview

MAX792MEPE from Maxim Integrated is a microprocessor supervisory circuit with dual reset outputs (RESET and RESET), 200ms power-up reset timeout, ±2% reset threshold accuracy (in external programming mode), and integrated watchdog timer with 1.6s nominal timeout. It monitors VCC for brownout detection, provides manual-reset input, low-line warning, and chip-enable gating for nonvolatile memory protection in embedded control systems.

For engineers reviewing the MAX792MEPE datasheet, MAX792MEPE pinout, MAX792MEPE application, or MAX792MEPE equivalent, this device supports critical µP power monitoring in industrial controllers and intelligent instruments where guaranteed reset validity down to VCC = 1V, programmable thresholds, and hardware-level write-cycle completion are required.

Technical Context

The MAX792MEPE implements independent reset and low-line comparators with internal 1.30V reference or external resistor-divider programming, enabling precise voltage monitoring at two distinct thresholds (e.g., 4.37V reset, 4.49V low-line). Its watchdog function uses an edge-sensitive WDI input and generates both pulsed WDPO (500µs min) and latched WDO outputs, with SWT-capacitor programmability for timeout periods beyond 1.6s.

It integrates a bidirectional CE transmission gate with ≤10ns propagation delay and active-low CE OUT that remains asserted for 15µs after reset assertion if CE IN is low-ensuring memory write-cycle completion during power-down. The device operates across 0°C to +70°C and supports both internal threshold mode (RESET IN/INT ≤60mV) and external programming mode (RESET IN/INT ≥600mV).

Key Specifications

Pinout & Package

MAX792MEPE is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX820MEPE, the MAX792MEPE offers identical functionality at lower cost and commercial temperature grade, but lacks extended-range accuracy assurance; compared with TPS3823MPDBVR, it delivers comprehensive supervision (dual reset, watchdog, CE gating) at the expense of higher pin count and quiescent current.

Availability

MAX792MEPE is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostic instruments, telecom base station management, and automotive infotainment head units requiring stable component supply with long-term lifecycle support.

Supply support for MAX792MEPE 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX792/MAX820 product line was designed specifically for microprocessor supervisory functions-including reset generation, power-fail warning, watchdog monitoring, and nonvolatile memory write protection-in systems lacking battery backup.

FAQ

What is the reset threshold voltage for MAX792MEPE?

The MAX792MEPE has a nominal reset threshold voltage of 4.37V, corresponding to the 'M' suffix in its part number. This value is factory-trimmed and guaranteed accurate within ±2% when used in external programming mode with appropriate resistor dividers. In internal threshold mode, the device uses its internal 1.30V reference scaled by internal resistors to achieve the 4.37V trip point.

Does MAX792MEPE support watchdog timeout adjustment?

Yes, the MAX792MEPE supports adjustable watchdog timeout via the SWT pin. With SWT tied to VCC, the default timeout is 1.6s. Connecting an external capacitor from SWT to GND sets a custom timeout: 27 × C (nF) ms at VCC = 3V, or 16.2 × C (nF) ms at VCC = 5V. Capacitor values must exceed 4.7nF, and SWT must never be left floating or grounded.

How does the chip-enable gating function work in MAX792MEPE?

The MAX792MEPE's CE gating uses an internal transmission gate between CE IN and CE OUT. During normal operation, CE transitions pass through with ≤10ns delay. When reset is asserted, the gate disables: if CE IN is low, CE OUT stays low for 15µs to complete the current memory write cycle; if CE IN is high, CE OUT goes high-impedance immediately-preventing corrupted writes during undervoltage.

Can MAX792MEPE monitor overvoltage conditions?

Yes, the MAX792MEPE includes an uncommitted overvoltage comparator with OVI (input) and OVO (output). When OVI exceeds 1.30V, OVO pulls low-providing a dedicated overvoltage flag independent of reset or watchdog functions. OVI should be connected to a resistor divider from the monitored rail; if unused, OVI must be tied to GND or VCC to avoid floating inputs.

What is the purpose of the LOW LINE output in MAX792MEPE?

The LOW LINE output in MAX792MEPE is an active-low signal that asserts 120mV above the reset threshold voltage (e.g., 4.49V when reset = 4.37V). It serves as a non-maskable interrupt (NMI) source to alert the microprocessor of impending power failure, enabling firmware to execute safe shutdown procedures-such as saving volatile data-before the full reset occurs.