Analog Devices Inc./Maxim Integrated MAX697EPE+

Overview

MAX697EPE+ from Maxim Integrated is a microprocessor supervisory circuit designed for power-supply monitoring and CMOS RAM write protection in industrial and embedded systems. It provides adjustable low-line reset (1.25V–1.35V), watchdog timeout (100ms/1.6s), 50ms reset pulse width, 1.3V power-fail detection, and CE IN/CE OUT chip-enable gating - all in a 16-pin PDIP package operating from -40°C to +85°C.

For engineers reviewing the MAX697EPE+ datasheet, MAX697EPE+ pinout, MAX697EPE+ application, or MAX697EPE+ equivalent, this page delivers verified functional scope, real-world timing behavior, supply-current performance (160–300µA), CE-gating propagation delay (80–150ns), and precise reset/warning thresholds - critical for reliable μP system startup, brownout recovery, and nonvolatile memory integrity.

Technical Context

The MAX697EPE+ integrates six core supervisory functions: precision 1.3V low-line detection with hysteresis, dual-mode watchdog timer (internal oscillator or external clock/capacitor), independent PFI-based power-fail warning, active-high and active-low RESET outputs, and bidirectional CE signal gating logic tied to LLIN status. Its CE IN/CE OUT path enforces write-protection only when VCC is valid and LLIN > 1.3V.

Unlike the MAX696, the MAX697EPE+ omits battery-backup switching (no VBATT/VOUT/BATT ON pins) and instead dedicates pins 12 and 13 to CE control. This enables deterministic RAM write blocking during brownout, while reducing quiescent current to ≤300µA - making it suitable for always-on, low-power μP systems requiring guaranteed memory safety without backup power management.

Key Specifications

Pinout & Package

MAX697EPE+ is housed in a 16-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696EPE+, the MAX697EPE+ trades battery-switching capability for lower power and deterministic CE write control - making it optimal for systems prioritizing memory integrity over backup power. Versus TPS3808G33DBVR, it delivers full-feature supervision (watchdog, dual reset, PFI, CE gating) at higher current but essential for complex μP reliability requirements.

Availability

MAX697EPE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and ruggedized data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX697EPE+ 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 demanding industrial, automotive, and communications applications - emphasizing reliability, integration, and thermal robustness.

The MAX697EPE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to consolidate reset, watchdog, power-fail warning, and memory write-protection functions into a single IC for mission-critical embedded systems.

FAQ

What is the primary function of the MAX697EPE+ in a microprocessor system?

The MAX697EPE+ serves as an integrated supervisory circuit that monitors VCC for brownout conditions, generates precise reset pulses, provides watchdog timer supervision, issues early power-fail warnings via PFO, and enforces hardware-level write protection for CMOS RAM using its CE IN/CE OUT gating logic - all within a single 16-pin PDIP package. Its design ensures deterministic system recovery and memory integrity without firmware intervention.

Does the MAX697EPE+ support battery-backup power switching like the MAX696?

No, the MAX697EPE+ does not support battery-backup switching. Unlike the MAX696, it omits VBATT, VOUT, and BATT ON pins entirely. Instead, it dedicates pins 12 and 13 to CE IN and CE OUT for RAM write protection. This architectural choice reduces quiescent current to ≤300µA and simplifies layout in systems where backup power management is handled externally or not required.

How does the CE IN/CE OUT functionality of the MAX697EPE+ protect memory during brownout?

The MAX697EPE+ forces CE OUT high whenever LLIN falls below 1.3V - regardless of CE IN state - effectively disabling chip-select or write-enable signals to attached CMOS RAM or EEPROM. This hardware-enforced gating prevents spurious writes during unstable VCC conditions. CE OUT tracks CE IN only when LLIN > 1.3V, with 80–150ns propagation delay, ensuring rapid response to voltage faults.

Can the watchdog timeout period of the MAX697EPE+ be adjusted, and how?

Yes, the MAX697EPE+ supports two watchdog timeout periods: 100ms and 1.6s. Selection is controlled by the OSC SEL pin (pin 7). When OSC SEL is high or floating, the internal oscillator sets timing - OSC IN (pin 6) selects short (100ms) or long (1.6s) mode. When OSC SEL is low, an external clock or capacitor on OSC IN determines timeout, enabling custom intervals such as 400ms or 1.6s scaled by capacitance value.

What is the operating temperature range and package type of the MAX697EPE+?

The MAX697EPE+ is rated for operation from -40°C to +85°C and is supplied in a 16-pin plastic dual-inline-package (PDIP) with lead-free finish (indicated by the '+' suffix). The package features through-hole mounting, 0.3-inch body width, and standard pin 1 identification via notch or dot - suitable for industrial-grade PCB assembly and rework.