Analog Devices Inc./Maxim Integrated MAX702CSA+

Overview

MAX702CSA+ from Maxim Integrated is a precision power-supply supervisory circuit designed to monitor +5V supplies and assert a reset signal during brownout, power-up, or manual reset events. It features a factory-trimmed 4.65V reset threshold, guaranteed valid RESET output down to VCC = 1V, 200ms minimum reset pulse width, debounced manual-reset input (MR), and operates in the commercial temperature range (0°C to +70°C) in an 8-pin narrow-SO package. It is used in microprocessor-based systems requiring reliable, low-component-count power monitoring.

For engineers reviewing the MAX702CSA+ datasheet, MAX702CSA+ pinout, MAX702CSA+ application, or MAX702CSA+ equivalent, key selection considerations include its fixed 4.65V detection threshold, active-low open-drain RESET output with 3.2mA sink capability, MR input compatibility with standard pushbutton interfaces, and immunity to fast VCC transients (100V/µs).

Technical Context

The MAX702CSA+ implements a dedicated voltage comparator with internal 4.65V reference to monitor VCC directly. Its reset logic guarantees monotonic assertion of the RESET output when VCC falls below threshold and holds it active for ≥200ms after VCC rises above threshold - independent of supply slew rate.

It integrates a debounced MR input with 5µA internal pullup and accepts TTL/CMOS-compatible logic levels. Unlike the MAX700/MAX701, it lacks SENSE, CTL, HYST, or RESET pins - confirming its role as the minimal-function variant optimized for fixed +5V system supervision.

Key Specifications

Pinout & Package

MAX702CSA+ is housed in an 8-pin narrow-SO (SOIC-8) package with 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix), and JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply supervisory applications.

Compared with TPS3123QDBVRQ1 and ADM6710ARZ-463, the MAX702CSA+ delivers drop-in simplicity for +5V commercial systems: no external components, built-in MR debounce, and guaranteed 1V operational floor - reducing validation scope and board area.

Availability

MAX702CSA+ is available at Aetrix Electronics and suitable for industrial PLC power monitoring, embedded microcontroller reset management, and point-of-sale terminal boot integrity requiring stable component supply and long-term commercial-grade availability.

Supply support for MAX702CSA+ 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, communications, and computing applications.

The MAX700/MAX701/MAX702 family was engineered specifically for cost-sensitive, space-constrained microprocessor systems requiring robust, zero-calibration power-supply supervision - with the MAX702CSA+ representing the minimal-feature, fixed-threshold variant for +5V applications.

FAQ

What is the reset threshold voltage of the MAX702CSA+ and how accurate is it over temperature?

The MAX702CSA+ has a factory-trimmed reset threshold of 4.65V with a tolerance of ±150mV over the full commercial temperature range (0°C to +70°C). This specification is guaranteed in production testing and does not require external calibration. The MAX702CSA+ achieves this accuracy using laser-trimmed on-chip resistors and a stable bandgap reference, ensuring consistent performance without user adjustment.

Does the MAX702CSA+ provide both active-high and active-low reset outputs?

No, the MAX702CSA+ provides only a single active-low, open-drain RESET output (pin 3). Unlike the MAX701, it does not include a complementary RESET output. The MAX702CSA+ is the simplest member of the family and omits dual-output functionality to reduce cost and pin count - making it ideal for systems requiring only one reset signal path.

Can the MAX702CSA+ operate with supply voltages below 5V, and what is its minimum functional VCC?

Yes, the MAX702CSA+ operates from VCC = 1.0V to 5.5V. Its RESET output is guaranteed to remain valid and correctly asserted down to VCC = 1.0V, enabling reliable brownout detection even during deep supply collapse. This behavior is confirmed in Figure 4 of the datasheet and specified under "Min VCC for Valid Reset Output" with 1mA sink test condition.

Is the manual-reset input (MR) on the MAX702CSA+ debounced in hardware or does it require external circuitry?

The MR input on the MAX702CSA+ is debounced entirely in hardware using internal timing circuitry - no external RC network or firmware polling is required. The datasheet specifies this as a key feature, and the internal 5µA pullup current allows direct connection to a momentary pushbutton switch tied to GND. This eliminates design uncertainty associated with mechanical switch bounce.

What package type and RoHS status does the MAX702CSA+ use, and how is that indicated in the part number?

The MAX702CSA+ uses an 8-pin narrow-SO (SOIC-8) package with RoHS-compliant lead-free finish. The '+' symbol at the end of the part number explicitly denotes lead-free packaging per Maxim's ordering convention. This matches the 'S8+4' package code and conforms to JEDEC MS-012AC outline dimensions and land pattern 90-0096.