Analog Devices Inc./Maxim Integrated MAX700CSA

Overview

MAX700CSA from Maxim Integrated is a precision power-supply supervisory circuit designed to monitor +5V systems and generate reliable reset signals for microprocessors. It features factory-trimmed 4.65V VCC threshold, ≥200ms reset pulse width, adjustable voltage detection via SENSE input (1.29V reference), adjustable hysteresis via HYST pin, and operates over 0°C to +70°C in 8-pin narrow-SO package. Used in critical µP power monitoring where supply stability and noise immunity are essential.

For engineers reviewing the MAX700CSA datasheet, MAX700CSA pinout, MAX700CSA application, or MAX700CSA equivalent, key selection criteria include its dual-mode sensing (VCC or external SENSE), guaranteed reset assertion down to 1V VCC, debounced manual-reset input, ±150mV threshold accuracy over temperature, and compatibility with lead-free PCB assembly.

Technical Context

The MAX700CSA implements a precision bandgap-referenced comparator architecture with internal 1.29V reference for SENSE-based monitoring and direct VCC sensing when CTL = GND. Its reset logic guarantees active-low RESET output for VCC ≤ 4.65V (±150mV) and maintains valid state down to 1V VCC.

It supports two distinct operating modes: fixed 4.65V VCC monitoring (CTL = GND), or user-defined threshold via resistor divider on SENSE (CTL = VCC), with HYST enabling programmable hysteresis to suppress noise-induced resets. The MR input includes internal 5µA pullup and debouncing circuitry.

Key Specifications

Pinout & Package

MAX700CSA is housed in an 8-pin narrow-SO (SOIC-8) package with 1.27mm pitch, RoHS-compliant, and rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and ADM6710ARTZ-REEL7, the MAX700CSA uniquely combines factory-trimmed VCC monitoring, user-programmable SENSE-based thresholds, dedicated HYST pin for noise immunity, and complementary RESET/RESET outputs - making it optimal for complex multi-rail or noise-prone designs.

Availability

MAX700CSA is available at Aetrix Electronics and suitable for computers, controllers, and intelligent instruments requiring stable component supply, long-term manufacturability, and RoHS-compliant narrow-SO packaging.

Supply support for MAX700CSA 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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, interface, sensing, and timing applications.

The MAX700 family was engineered specifically for robust, low-component-count power supervision in microprocessor-based systems - emphasizing reliability under brownout, noise immunity, and flexibility across voltage domains.

FAQ

What is the primary function of the MAX700CSA?

The MAX700CSA is a precision power-supply supervisory circuit that monitors VCC or an external voltage via the SENSE pin and generates a guaranteed-valid reset signal. Its core function is to ensure microprocessor systems start up correctly and recover safely from undervoltage events. The MAX700CSA achieves this with a factory-trimmed 4.65V threshold, ≥200ms reset pulse, and operation down to 1V VCC - all without external components in basic +5V configurations.

How does the MAX700CSA differ from the MAX701CSA and MAX702CSA?

The MAX700CSA supports both VCC and external SENSE-based monitoring, plus adjustable hysteresis via the HYST pin - capabilities absent in MAX701CSA and MAX702CSA. While all three share the same 8-pin narrow-SO package and 4.65V nominal threshold, only the MAX700CSA includes SENSE, HYST, and CTL pins. The MAX701CSA provides complementary RESET/RESET outputs, and the MAX702CSA offers only RESET - making the MAX700CSA the most feature-rich variant for flexible voltage supervision.

Can the MAX700CSA monitor voltages other than +5V?

Yes, the MAX700CSA can monitor any voltage between 3V and 15V using its SENSE input. When CTL = VCC, the internal 1.29V reference compares against a resistor-divider output from the target rail. For example, a 12V rail can be scaled to 1.29V using R1/R2 = 7.52:1. This capability is exclusive to the MAX700CSA within the family and is confirmed in the Electrical Characteristics table and Pin Description section of the datasheet.

What is the purpose of the HYST pin on the MAX700CSA?

The HYST pin on the MAX700CSA provides direct control over hysteresis magnitude when monitoring external voltages via SENSE. When activated, it connects a ~1kΩ switch to GND, allowing designers to inject precise hysteresis current into the SENSE node. This prevents false resets caused by supply ripple or noise - a key differentiator versus fixed-hysteresis supervisors. The HYST function is documented in Figure 3 and the Pin Description table, and is unique to the MAX700CSA.

Is the MAX700CSA RoHS-compliant and lead-free?

Yes, the MAX700CSA is RoHS-compliant and available in lead-free packaging. Per the Ordering Information section, "Devices in PDIP and SO packages are available in both leaded and lead(Pb)-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering." The MAX700CSA itself - without suffix - is supplied in lead-free narrow-SO per Maxim's standard RoHS policy effective Rev 3 (5/14).