Analog Devices Inc./Maxim Integrated MAX700EPA+

Overview

MAX700EPA+ 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 reset threshold, ≥200ms reset pulse width, manual-reset debouncing, and operates across -40°C to +85°C in 8-pin PDIP packaging. Used for critical µP power monitoring in industrial controllers and intelligent instruments.

For engineers reviewing the MAX700EPA+ datasheet, MAX700EPA+ pinout, MAX700EPA+ application, or MAX700EPA+ equivalent, key selection factors include guaranteed reset assertion down to VCC = 1V, adjustable voltage detection via SENSE/CTL pins, internal hysteresis control, and compatibility with lead-free PCB assembly due to the "+" suffix.

Technical Context

The MAX700EPA+ implements dual-comparator supervision: one monitors VCC directly (when CTL = GND), while another monitors external voltage via SENSE (when CTL = VCC) with 1.29V reference. Its internal oscillator and RC timing network ensure minimum 200ms reset pulse width independent of supply ramp rate.

Reset assertion occurs when VCC falls below 4.65V (±150mV over temperature) or when SENSE drops below 1.29V (±40mV). HYST pin enables programmable hysteresis by connecting an external resistor to ground, reducing noise-induced false resets during marginal supply conditions.

Key Specifications

Pinout & Package

MAX700EPA+ uses an 8-pin plastic dual-inline package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing conforms to JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6713ARZ-46, the MAX700EPA+ uniquely supports both VCC and external SENSE monitoring modes, offers user-adjustable hysteresis, and provides complementary RESET/RESET outputs - making it suitable for complex multi-rail systems requiring flexible supervision architecture.

Availability

MAX700EPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and telecom line cards requiring stable component supply across extended temperature ranges and RoHS-compliant manufacturing.

Supply support for MAX700EPA+ 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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.

The MAX700 family delivers highly reliable power-supply supervision with configurable monitoring modes and robust reset timing - engineered specifically for mission-critical embedded systems demanding fail-safe startup and brownout recovery.

FAQ

What is the guaranteed minimum reset pulse width for MAX700EPA+?

The MAX700EPA+ guarantees a minimum reset pulse width of 200ms during power-up, power-down, and low-voltage conditions. This timing is generated by an internal RC oscillator and is independent of VCC ramp rate. The actual pulse width ranges from 200ms to 500ms depending on process and temperature variation. This ensures microprocessors receive sufficient reset hold time before release, preventing premature execution.

Can MAX700EPA+ monitor voltages other than +5V?

Yes, the MAX700EPA+ can monitor non-5V supplies using its SENSE input. When CTL is tied to VCC, the internal 1.29V reference compares against the voltage applied to SENSE. By using an external resistor divider, users can scale any input voltage (e.g., 3.3V, 2.5V, or 12V) to match the 1.29V threshold. This enables flexible supervision of diverse system rails without changing the MAX700EPA+ itself.

Does MAX700EPA+ require external components for basic +5V supervision?

No, the MAX700EPA+ requires zero external components for standard +5V supervision. Its factory-trimmed 4.65V reset threshold, debounced MR input, and internal timing network eliminate the need for external resistors, capacitors, or diodes. Only VCC, GND, MR (optional), and RESET/RESET connections are needed - reducing BOM count, board area, and qualification effort in production designs.

What does the '+' suffix in MAX700EPA+ indicate?

The '+' suffix in MAX700EPA+ indicates lead(Pb)-free, RoHS-compliant packaging. It specifies that the 8-pin PDIP device meets JEDEC J-STD-609 Category 1 marking requirements and uses matte-tin plating instead of traditional lead-based finishes. This enables compliance with environmental regulations and compatibility with modern Pb-free solder reflow profiles without altering electrical or thermal performance.

How does hysteresis work on MAX700EPA+?

Hysteresis on the MAX700EPA+ is implemented via the HYST pin, which connects to ground through an external resistor when SENSE monitoring is enabled (CTL = VCC). The internal HYST switch turns on ~5µs before RESET activation and presents ~1kΩ resistance to GND. This creates a voltage offset at the SENSE comparator input, widening the gap between turn-on and turn-off thresholds - suppressing false resets caused by supply noise or ripple near the trip point.