Analog Devices Inc./Maxim Integrated MAX700CPA

Overview

MAX700CPA from Maxim Integrated is a precision power-supply supervisory circuit designed to monitor +5V systems and generate reliable reset signals during power-up, power-down, and brownout conditions. It features factory-trimmed 4.65V VCC threshold, adjustable voltage detection via SENSE input (1.29V reference), programmable hysteresis via HYST pin, debounced manual-reset input (MR), and guaranteed RESET assertion down to VCC = 1V - used in microprocessor-based industrial controllers requiring deterministic reset timing.

For engineers reviewing the MAX700CPA datasheet, MAX700CPA pinout, MAX700CPA application, or MAX700CPA equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use cases for critical µP power monitoring, and two validated alternative parts with documented functional distinctions.

Technical Context

The MAX700CPA implements dual-mode voltage supervision: internal VCC monitoring (CTL = GND) with fixed 4.65V threshold, or external voltage monitoring (CTL = VCC) using the 1.29V SENSE comparator reference with resistor-divider scaling. Its HYST pin enables user-adjustable hysteresis by sinking current to ground, reducing noise-induced false resets.

It generates both active-low RESET and active-high RESET outputs with minimum 200ms pulse width, guaranteed valid reset state down to VCC = 1V, and supports manual reset via MR with internal 5µA pullup and 0.7V logic threshold. All functions operate across 0°C to +70°C without external components in +5V systems.

Key Specifications

Pinout & Package

MAX700CPA is supplied in an 8-pin plastic dual-inline package (PDIP), leaded or lead(Pb)-free (RoHS-compliant when ordered with '+' suffix). Pin spacing is 0.300", body width 0.355", standard through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX702CPA and TPS3808G33DBVR, the MAX700CPA uniquely supports both internal and external voltage monitoring modes, provides complementary RESET/RESET outputs, and integrates debounced manual reset - making it the only option among the three capable of flexible multi-rail supervision with minimal external components.

Availability

MAX700CPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and embedded network routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for MAX700CPA 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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and computing applications.

The MAX700CPA belongs to the MAX700/MAX701/MAX702 family of supervisory circuits engineered specifically for deterministic power-on reset generation and brownout protection in +5V microprocessor systems.

FAQ

What is the reset threshold voltage for MAX700CPA when monitoring VCC directly?

The MAX700CPA has a factory-trimmed VCC reset threshold of 4.65V, with guaranteed range of 4.50V to 4.75V across 0°C to +70°C. This applies when CTL is tied to GND for internal VCC monitoring. The threshold is specified at power-up and power-down, ensuring consistent behavior during both transitions. The MAX700CPA maintains valid reset output down to VCC = 1.0V, supporting robust brownout response.

Can MAX700CPA monitor a 3.3V supply rail, and how is it configured?

Yes, the MAX700CPA can monitor a 3.3V rail using its SENSE input. To do so, tie CTL to VCC to enable external sensing mode, then connect a resistor divider from the 3.3V rail to SENSE so that the divided voltage equals 1.29V at the threshold point. The SENSE input has a 1.25V–1.35V threshold range and draws only 0.1nA, minimizing loading. This configuration is explicitly supported in the MAX700CPA datasheet and requires no additional components beyond the divider resistors.

Does MAX700CPA provide both active-low and active-high reset outputs?

Yes, the MAX700CPA provides complementary reset outputs: pin 5 is open-drain active-low RESET, and pin 6 is active-high RESET. The RESET output requires an external pullup resistor to VCC or another logic rail, while RESET drives low actively. This dual-output architecture allows direct connection to microprocessors requiring either reset polarity without level-shifting. Both outputs are asserted simultaneously for ≥200ms during power-up, power-down, or brownout events.

What is the purpose of the HYST pin on MAX700CPA, and how is it used?

The HYST pin on MAX700CPA enables user-programmable hysteresis to prevent false resets caused by supply noise or slow-rising voltages. When monitoring via SENSE (CTL = VCC), connecting HYST to GND through a resistor adds hysteresis proportional to the resistor value. The HYST pin turns on ~5µs before RESET activation and presents ~1kΩ on-resistance to ground. This feature is unique to the MAX700CPA within the MAX700/MAX701/MAX702 family and is documented in Figure 3 of the MAX700CPA datasheet.

Is manual reset debounced internally in MAX700CPA, and what are the MR interface requirements?

Yes, the MAX700CPA includes internal debouncing for the MR (pin 1) input. It features a built-in 5µA pullup current and a Schmitt-trigger input with 0.7V threshold, eliminating the need for external RC filters. A simple momentary switch from MR to GND is sufficient - no external capacitor or resistor is required. This internal debounce ensures clean, bounce-free reset assertion, and the MR function is fully operational across the entire 0°C to +70°C temperature range of the MAX700CPA.