Analog Devices Inc./Maxim Integrated MAX695EPE+

Overview

MAX695EPE+ from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing precision reset generation, adjustable watchdog timer, battery backup switchover, power-fail detection, and chip-enable gating for CMOS RAM/EEPROM. It features 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog, 1.3V PFI comparator, and operates from -40°C to +85°C in plastic DIP package. Used in industrial controllers and automotive ECUs for reliable µP power monitoring.

For engineers reviewing the MAX695EPE+ datasheet, MAX695EPE+ pinout, MAX695EPE+ application, or MAX695EPE+ equivalent, key selection criteria include reset voltage accuracy (±150mV), battery switchover hysteresis (20mV), CE OUT propagation delay (50–200ns), and compatibility with 2.0–4.25V backup batteries - all critical for fail-safe memory retention and brownout recovery in embedded systems.

Technical Context

The MAX695EPE+ integrates five core supervisory functions: a precision 4.65V reset comparator with 40mV hysteresis, an adjustable watchdog timer (100ms/1.6s internal or clock/capacitor-extended), bidirectional battery switchover (VCC/VBATT → VOUT), 1.3V power-fail detector with PFO output, and CE IN/CE OUT gating logic that forces CE OUT high during low-VCC events to prevent erroneous RAM writes.

Its dual-output reset architecture includes active-low RESET and active-high RESET, while BATT ON and LOW LINE provide discrete status signals for external transistor control and real-time VCC monitoring. Timing is controlled via OSC SEL and OSC IN pins, enabling configuration of both reset delay and watchdog timeout using internal oscillator, external clock, or RC network - all without requiring external timing components in default mode.

Key Specifications

Pinout & Package

MAX695EPE+ 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 MAX695CPE+ and MAX695MJE+, the MAX695EPE+ uniquely balances industrial temperature robustness (-40°C to +85°C), full feature set (adjustable watchdog, CE gating, dual reset), and commercial pricing - making it optimal for automotive, industrial, and medical edge devices where reliability and cost both matter.

Availability

MAX695EPE+ is available at Aetrix Electronics and suitable for industrial controllers, automotive ECUs, medical instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX695EPE+ 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, and connectivity in harsh environments.

The MAX695EPE+ belongs to the MAX690–MAX695 family of microprocessor supervisory circuits, engineered specifically to replace discrete reset, watchdog, and battery-switching components in µP-based systems requiring high reliability and minimal board space.

FAQ

What is the operating temperature range of the MAX695EPE+?

The MAX695EPE+ is specified for operation from -40°C to +85°C, making it suitable for industrial and automotive applications where ambient conditions exceed commercial-grade limits. This rating is validated per Maxim's E-grade qualification standard and includes full electrical performance testing across the entire range - including reset threshold stability, watchdog timing accuracy, and battery switchover hysteresis - ensuring consistent behavior in thermal cycling environments.

Does the MAX695EPE+ support adjustable reset timeout, and how is it configured?

Yes, the MAX695EPE+ supports configurable reset timeout via the OSC SEL and OSC IN pins. With OSC SEL floating and OSC IN low, reset delay is 50ms; with OSC SEL floating and OSC IN floating, it is 200ms - the default setting for MAX695EPE+. External clock or capacitor on OSC IN enables further customization per Table 1 in the datasheet. This adjustability is implemented entirely internally, requiring no external RC networks or trimming.

How does the CE OUT pin protect CMOS RAM during power failure?

The CE OUT pin of the MAX695EPE+ drives the chip-enable input of CMOS RAM and is designed to go high automatically whenever VCC falls below 4.65V - regardless of CE IN state. This action disables RAM writes during brownout, power-up, or momentary dropout. The 50–200ns propagation delay ensures fast response, and the output remains high until VCC recovers fully, preventing partial or corrupted writes even during microsecond-scale glitches.

Can the MAX695EPE+ monitor a backup battery voltage directly?

Yes, the MAX695EPE+ can monitor backup battery health using its PFI (Power-Fail Input) pin. By connecting VBATT to PFI through a resistive divider (or directly if VBATT ≤ 1.3V), the internal 1.3V comparator asserts PFO when battery voltage drops below the threshold. Note that the PFI comparator is disabled when VCC < VBATT, so this method works best when main power is present - for true low-battery alert during backup-only operation, external supervision is recommended.

What is the maximum output current capability of the VOUT pin on the MAX695EPE+?

The VOUT pin of the MAX695EPE+ delivers up to 50mA when sourced from VCC, with a typical dropout voltage of 0.1–0.5V depending on load. During battery backup (VCC = 0V), VOUT is supplied from VBATT via a 200Ω MOSFET switch, supporting lower currents - typically <1mA for CMOS RAM retention. For loads exceeding 50mA, the BATT ON pin can drive an external PNP transistor to augment current delivery while maintaining low quiescent draw.