Analog Devices Inc./Maxim Integrated MAX792TEPE+

Overview

MAX792TEPE+ 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 timeout detection (1.6s nominal), and chip-enable signal gating for nonvolatile memory protection. It guarantees valid RESET output down to VCC = 1V and supports internal or externally programmed reset/low-line thresholds.

For engineers reviewing the MAX792TEPE+ datasheet, MAX792TEPE+ pinout, MAX792TEPE+ application, or MAX792TEPE+ equivalent, this page delivers verified functional identity, confirmed 16-pin PDIP package mapping, validated 4.62V reset threshold (T suffix), exact watchdog timing behavior, and real-world memory write-cycle protection implementation details.

Technical Context

The MAX792TEPE+ integrates independent reset and low-line comparators with ±2% threshold accuracy in external programming mode, a 1.6s nominal watchdog timer adjustable via SWT capacitor, and a 10ns max propagation delay chip-enable transmission gate. Its dual reset outputs (RESET and RESET) support both active-high and active-low µP interfaces while maintaining validity down to 1V supply.

It implements dual-mode threshold selection: internal mode (RESET IN/INT ≤60mV) uses factory-trimmed 1.30V reference; external mode (RESET IN/INT ≥600mV) enables resistor-divider programming of both reset and low-line thresholds. The watchdog fault path includes WDPO (pulse warning) and WDO (latched shutdown) with 70ns inter-output timing relationship.

Key Specifications

Pinout & Package

MAX792TEPE+ is housed in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts and socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX820TEPE+, MAX792TEPE+ offers identical pinout and core functionality but trades guaranteed ±2% threshold accuracy for lower cost; compared with TPS3823MPDBVR, it provides comprehensive supervision (watchdog, CE gating, dual reset, low-line) at the expense of higher integration complexity and BOM count.

Availability

MAX792TEPE+ is available at Aetrix Electronics and suitable for industrial PLC power monitoring, medical device brownout protection, telecom line card supervision, and automotive infotainment boot integrity requiring stable component supply with long-term lifecycle assurance.

Supply support for MAX792TEPE+ 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 and mixed-signal ICs for power, sensing, connectivity, and security applications in industrial, automotive, and communications markets.

The MAX792TEPE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to provide integrated reset, watchdog, memory protection, and power-fail warning in single-chip solutions for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage for MAX792TEPE+?

The MAX792TEPE+ has a nominal reset threshold voltage of 4.62V, corresponding to the 'T' suffix in its part number. This value is factory-trimmed and specified with ±2% accuracy in external programming mode per the datasheet. At +25°C and VCC falling, the typical threshold is 4.62V with min/max bounds of 4.50V/4.75V. The device guarantees valid RESET output down to VCC = 1V regardless of threshold setting.

How does the watchdog function operate in MAX792TEPE+?

The MAX792TEPE+ watchdog monitors the WDI pin for transitions. If no edge occurs within 1.6s (default, with SWT tied to VCC), WDPO pulses low for 500µs–6ms, followed 70ns later by WDO asserting low. WDO remains latched low until the next WDI transition. The timeout is adjustable using a capacitor on SWT: 27 × C(nF) ms at 3V, 16.2 × C(nF) ms at 5V. Watchdog operation is disabled when VCC falls below the reset threshold.

Can MAX792TEPE+ be used with 3.3V systems?

Yes, MAX792TEPE+ operates from 2.75V to 5.5V, making it fully compatible with 3.3V systems. Its reset threshold is fixed at 4.62V, so it is intended for monitoring 5V supplies. For 3.3V rail supervision, external resistor-divider programming (via RESET IN/INT and LLIN/REFOUT) can configure custom thresholds, though the T-suffix variant is optimized for 5V applications. All logic inputs accept 3.3V-compatible levels.

What is the purpose of the CE IN and CE OUT pins on MAX792TEPE+?

The CE IN and CE OUT pins implement a transmission gate that blocks chip-enable signals to nonvolatile memory during brownout. When reset is deasserted, CE IN passes directly to CE OUT with ≤10ns delay. When reset asserts, CE OUT is forced high-impedance or pulled up (depending on CE IN state), preventing spurious memory writes. If CE IN is low at reset assertion, CE OUT stays low for 15µs to complete the current write cycle-ensuring data integrity.

How do I configure MAX792TEPE+ for external reset threshold programming?

To configure external programming mode on MAX792TEPE+, drive RESET IN/INT to ≥600mV (e.g., via resistor divider from VCC). This disconnects internal references and connects LLIN/REFOUT to the low-line comparator and RESET IN/INT to the reset comparator. Apply external voltage dividers to LLIN/REFOUT and RESET IN/INT to set desired thresholds. The MAX792TEPE+ datasheet provides equations for calculating R1/R2/R3 values based on target voltages and current budget (e.g., 5µA).