Analog Devices Inc./Maxim Integrated MAX792RCPE+

Overview

MAX792RCPE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, manual reset input, two-stage power-fail warning (low-line detection 120mV above reset threshold), watchdog timer with pulsed fault output, and chip-enable gating for CMOS RAM write protection. It guarantees RESET validity down to VCC = 1V and supports internal or externally programmed reset/low-line thresholds. Used in embedded controllers and intelligent instruments requiring reliable power-up/down sequencing.

For engineers reviewing the MAX792RCPE+ datasheet, MAX792RCPE+ pinout, MAX792RCPE+ application, or MAX792RCPE+ equivalent, key selection criteria include its 4.62V nominal reset threshold (R-suffix), 200ms reset timeout, ±2% threshold accuracy in external programming mode, guaranteed 1V operation, and integrated CE signal gating with 10ns max propagation delay.

Technical Context

The MAX792RCPE+ implements dual independent comparators-one for reset assertion and one for low-line warning-with factory-trimmed 4.62V reset threshold and 4.74V low-line threshold in internal mode. Its watchdog function uses an RC-timed timeout (1.6s nominal with SWT tied to VCC) and delivers both immediate pulse (WDPO) and latched fault (WDO) outputs.

It features on-board transmission-gate logic for CE IN/CE OUT path control, disabling CE during reset to prevent memory corruption, with 15µs hold time if CE IN is low at reset assertion. The device operates across 2.75V–5.5V supply range and supports both internal threshold mode (RESET IN/INT grounded) and external resistor-divider programming mode (RESET IN/INT ≥600mV).

Key Specifications

Pinout & Package

MAX792RCPE+ 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 with 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 MAX820RCPE+, the MAX792RCPE+ offers identical functionality at lower cost but with looser threshold accuracy; compared with TPS3823-46DBVR, it provides full feature set (dual reset, NMI, watchdog, CE gating) in larger DIP package-critical for legacy industrial designs requiring through-hole assembly and robust noise immunity.

Availability

MAX792RCPE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply with long-term lifecycle support.

Supply support for MAX792RCPE+ 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 MAX792RCPE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-up/down sequencing, brownout protection, and memory write-cycle completion in embedded systems without battery backup.

FAQ

What is the reset threshold voltage of the MAX792RCPE+?

The MAX792RCPE+ has a nominal reset threshold voltage of 4.62V in internal threshold mode, as indicated by the 'R' suffix in the part number. This value is factory-trimmed and specified with ±3% typical accuracy over temperature. The device guarantees RESET output validity down to VCC = 1V, making it suitable for deep brownout recovery scenarios where other supervisors fail.

How does the MAX792RCPE+ provide early power-fail warning?

The MAX792RCPE+ provides early power-fail warning via its LOW LINE output, which asserts 120mV above the reset threshold (i.e., 4.74V for the R-suffix variant). This dedicated low-line comparator triggers a non-maskable interrupt (NMI) to the microprocessor before reset occurs, enabling controlled shutdown or data save operations. The 120mV offset is fixed and not user-adjustable in internal mode.

Can the MAX792RCPE+ be used with a 3.3V microprocessor system?

Yes, the MAX792RCPE+ supports 3.3V systems via external threshold programming mode. By connecting RESET IN/INT to ≥600mV and using resistor dividers on LLIN/REFOUT and RESET IN/INT, users can set custom reset thresholds (e.g., 3.06V or 2.91V variants exist). Its 2.75V–5.5V supply range and TTL/CMOS-compatible inputs ensure interoperability with 3.3V logic, though the R-suffix 4.62V internal threshold is optimized for 5V rails.

What is the purpose of the CE IN and CE OUT pins on the MAX792RCPE+?

The CE IN and CE OUT pins implement a transmission gate that blocks chip-enable signals to memory during reset. When reset is asserted, CE IN becomes high-impedance and CE OUT is pulled high, preventing erroneous writes to CMOS RAM or EEPROM during brownout. With 10ns max propagation delay and 15µs hold time if CE IN is low at reset, the MAX792RCPE+ ensures memory write-cycle completion before gating.

Does the MAX792RCPE+ include watchdog functionality, and how is it configured?

Yes, the MAX792RCPE+ includes a configurable watchdog timer monitored via WDI. Its nominal timeout is 1.6s when SWT is tied to VCC. Connecting a capacitor from SWT to GND sets alternative timeouts (e.g., 4.7nF yields ~76ms at 5V). WDPO provides a pre-fault pulse; WDO latches low until next WDI transition. Watchdog is automatically disabled when VCC falls below the reset threshold.