Analog Devices Inc./Maxim Integrated MAX695CPE

Overview

MAX695CPE from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing precision reset generation, adjustable watchdog timer, battery backup switchover, RAM write protection via CE gating, and power-fail detection. It features a 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog, 1.3V PFI comparator, and operates from 4.75V to 5.5V VCC with 1µA battery-backup current. It is used in industrial controllers and critical embedded systems requiring reliable power monitoring and data integrity.

For engineers reviewing the MAX695CPE datasheet, MAX695CPE pinout, MAX695CPE application, or MAX695CPE equivalent, this page delivers verified functional specifications, validated pin roles, confirmed timing parameters (200ms reset delay, 1.6s watchdog), real-world CE gating behavior, and accurate alternative part comparisons - all grounded in Maxim's official MAX690–MAX695 family documentation.

Technical Context

The MAX695CPE integrates five core supervisory functions: (1) precision reset generation with 4.65V ±150mV threshold and 200ms timeout; (2) dual-mode watchdog timer (internal oscillator or external clock input via OSC IN/OSC SEL); (3) automatic battery switchover with 70mV power-up / 50mV power-down hysteresis; (4) CE IN/CE OUT gating logic that forces CE OUT high when VCC drops below 4.65V; and (5) 1.3V PFI comparator with PFO output for early power-fail warning. All functions operate within 0°C to +70°C (C-suffix).

Its 16-pin PDIP package supports full feature set differentiation from 8-pin variants: CE gating, BATT ON output, LOW LINE, WDO, OSC IN, and OSC SEL pins are exclusive to the 16-pin family (MAX691/MAX693/MAX695). The internal timebase drives both reset delay and watchdog timeout, with timing configurable via OSC SEL state and OSC IN connection - enabling design flexibility without external RC networks.

Key Specifications

Pinout & Package

MAX695CPE is supplied in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and standard through-hole mounting. Pin spacing is 0.1 inch, compatible with industry-standard PCB footprints for 16-pin DIP ICs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX695CPD and MAX693CPD, the MAX695CPE offers through-hole reliability and thermal performance advantages in industrial enclosures, while maintaining full functional equivalence to MAX695CPD and precise 4.65V reset alignment unmatched by the 4.4V MAX693CPD - making it the preferred choice for new 5V ±5% designs requiring DIP packaging.

Availability

MAX695CPE is available at Aetrix Electronics and suitable for industrial controllers, automotive body modules, medical diagnostic instruments, and telecom remote terminal units requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX695CPE 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The MAX690–MAX695 family was designed specifically for robust microprocessor system supervision - integrating reset, watchdog, battery switchover, CE gating, and power-fail detection into single-chip solutions for mission-critical embedded systems.

FAQ

What is the reset threshold voltage of the MAX695CPE?

The MAX695CPE has a guaranteed reset threshold of 4.65V, with a minimum of 4.5V and maximum of 4.75V across the full operating temperature range. This 4.65V threshold is optimized for compatibility with standard 5V ±5% power supplies, ensuring reset assertion well before µP operational failure. The MAX695CPE uses internal trimmed resistors to achieve this precision, eliminating the need for external calibration components.

How does the MAX695CPE handle battery backup switchover?

The MAX695CPE automatically switches VOUT between VCC and VBATT based on relative voltage levels, with 70mV hysteresis on power-up and 50mV on power-down to prevent oscillation. When VCC drops below VBATT minus 70mV, the internal 200Ω MOSFET connects VBATT to VOUT, supplying up to 50mA to backup RAM. The MAX695CPE draws only 1µA in this mode, extending coin-cell life significantly.

Can the watchdog timeout period of the MAX695CPE be adjusted?

Yes, the MAX695CPE supports adjustable watchdog timeout periods via the OSC SEL and OSC IN pins. With OSC SEL floating and OSC IN low, the timeout is 100ms; with OSC SEL floating and OSC IN high, it is 1.6s. Alternatively, connecting an external clock (0–250kHz) or capacitor (e.g., 47pF) to OSC IN enables further customization - allowing precise tuning to match firmware execution cycles without adding external timing circuitry.

What is the function of the CE IN and CE OUT pins on the MAX695CPE?

The CE IN and CE OUT pins implement hardware write protection for battery-backed RAM or EEPROM. CE OUT is a buffered replica of CE IN only when VCC ≥ 4.65V; if VCC drops below this threshold, CE OUT is forced high regardless of CE IN state - disabling chip select and preventing erroneous writes during brownout. This feature is exclusive to the 16-pin MAX695CPE and not available on 8-pin variants like MAX690.

Does the MAX695CPE provide an active-high reset output?

Yes, the MAX695CPE provides both active-low and active-high reset outputs on separate pins (pin 11 = RESET, pin 12 = RESET). The active-high RESET output is the logical inverse of the active-low version and can directly drive the reset input of microprocessors that require high-true reset signaling - eliminating the need for an external inverter and reducing BOM count and board area.