Analog Devices Inc./Maxim Integrated MAX795TEPA

Overview

MAX795TEPA from Maxim Integrated is an 8-pin DIP microprocessor supervisory circuit designed for +3.0V/+3.3V systems, providing precision reset assertion (3.00V–3.15V threshold), backup-battery switchover (VBATT up to 3.6V), and chip-enable signal gating with ≤7ns propagation delay. It monitors VCC, asserts active-low RESET during undervoltage or manual reset, and supports CMOS RAM write protection in battery-backup mode.

For engineers reviewing the MAX795TEPA datasheet, MAX795TEPA pinout, MAX795TEPA application, or MAX795TEPA equivalent, this device serves as a fixed-threshold voltage supervisor with integrated battery switching, CE gating, and low-line warning-critical for reliable power sequencing in portable and embedded controllers where supply stability and data integrity are non-negotiable.

Technical Context

The MAX795TEPA implements a precision bandgap-based reset comparator with 10mV typical hysteresis and guaranteed reset assertion down to VCC = 1V. Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT when VCC falls below the battery switch threshold (VSW = 2.55V min), supporting lithium coin-cell backup without external FETs.

It integrates a dedicated CE IN-to-CE OUT transmission gate with 46Ω on-resistance and ≤7ns propagation delay, enabling real-time gating of memory chip-enable signals during brownout. Unlike the MAX793/MAX794, it omits watchdog timer, BATT OK output, and manual reset input-reducing pin count while retaining core supervision and backup functions.

Key Specifications

Pinout & Package

MAX795TEPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard 0.1-inch pin spacing, suitable for manual soldering and socket-based development.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX793TEPA, MAX795TEPA saves 8 pins and removes unused features (watchdog, MR) while retaining identical reset accuracy and battery switching-ideal for minimal-footprint, battery-backed RAM applications. Versus TPS3808G33DBVR, MAX795TEPA adds critical battery switchover and CE gating but requires larger DIP packaging.

Availability

MAX795TEPA is available at Aetrix Electronics and suitable for portable equipment, embedded controllers, and critical µP power monitoring applications requiring stable component supply across extended production lifecycles.

Supply support for MAX795TEPA 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 computing markets.

The MAX793/MAX794/MAX795 product line delivers compact, feature-optimized supervisory circuits for 3.0V/3.3V microprocessor systems-designed specifically to ensure data integrity and fail-safe power sequencing in battery-critical applications.

FAQ

What is the exact reset threshold voltage range for MAX795TEPA?

The MAX795TEPA has a fixed reset threshold of 3.00V to 3.15V (VCC falling), specified for use in +3.3V systems with ±5% supply tolerance. This range ensures reset is asserted before the supply drops below 3.0V while avoiding false triggers above 3.15V. The threshold is factory-trimmed and does not require external resistors-unlike the adjustable MAX794.

Does MAX795TEPA support backup-battery switchover, and what is the maximum VBATT voltage?

Yes, MAX795TEPA supports automatic backup-battery switchover via an internal p-channel MOSFET. It accepts VBATT up to +6.0V absolute maximum, and is fully characterized for 3.6V lithium batteries. The switch activates when VCC falls below the battery switch threshold (VSW = 2.55V min), ensuring continuous RAM power without external components.

What is the function of the BATT ON pin on MAX795TEPA, and how is it used?

The BATT ON pin on MAX795TEPA is an open-drain output that goes high when the internal switch connects OUT to BATT. It is designed to drive the gate of an external PMOS transistor (e.g., Si9433DY) to handle load currents exceeding 75mA. When BATT ON is low, OUT is sourced from VCC; when high, OUT is sourced from BATT-enabling scalable backup power delivery.

Can MAX795TEPA be used without a backup battery, and how should pins be configured?

Yes, MAX795TEPA operates normally without a backup battery. To disable battery functionality, connect BATT, VCC, and OUT together at the same node. Leave PFI unconnected or tie to VCC if unused; PFO must remain unconnected unless used for power-fail warning. No pullups or external components are required for basic reset supervision.

How does the CE IN-to-CE OUT gating function protect CMOS RAM in MAX795TEPA?

The CE IN-to-CE OUT transmission gate in MAX795TEPA disables during reset assertion, blocking erroneous chip-enable transitions from reaching RAM during undervoltage. With ≤7ns propagation delay and 46Ω on-resistance, it maintains timing integrity while preventing partial writes. If CE IN is low when reset asserts, CE OUT stays low for 10µs to complete the current memory cycle-ensuring data coherency.