Analog Devices Inc./Maxim Integrated MAX709RCPA

Overview

MAX709RCPA from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3V and +3.3V microprocessor systems. It asserts RESET when VCC falls below 2.63V (±0.08V), holds reset for ≥140ms after VCC recovers, operates down to 1.0V supply, draws only 35µA typical supply current, and is housed in an 8-pin plastic DIP package.

For engineers reviewing the MAX709RCPA datasheet, MAX709RCPA pinout, MAX709RCPA application, or MAX709RCPA equivalent, this device serves as a low-cost, no-component-required supervisory solution for brownout detection, power-up sequencing, and system-level reset control in embedded controllers and industrial microcontroller units.

Technical Context

The MAX709RCPA integrates a precision voltage comparator with hysteresis, a 140ms monostable delay circuit, and an open-drain RESET output driver. Its reset threshold is factory-trimmed to 2.63V with ±3% accuracy over temperature, and its internal timing circuit ensures deterministic reset assertion during both power-down and power-up transitions.

It features immunity to short negative VCC transients (e.g., ≤40µs at 100mV overdrive), guarantees valid RESET state down to VCC = 1.0V, and supports direct interfacing with CMOS µP reset inputs without external pull-ups-enabling robust operation in noisy or marginally regulated 3V systems.

Key Specifications

Pinout & Package

MAX709RCPA is supplied in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole footprint. Pin 1 is top-left corner (notch side), with pins numbered counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706RPA and TPS3808G12DBVR, the MAX709RCPA delivers the simplest, lowest-cost reset-only supervision in DIP format with proven transient immunity-ideal when no manual reset or watchdog is required and through-hole assembly is preferred.

Availability

MAX709RCPA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, POS terminal boot sequencers, and smart energy meters requiring stable component supply across commercial temperature range and through-hole assembly compatibility.

Supply support for MAX709RCPA 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 MAX709 family was designed specifically for cost-sensitive, space-constrained microprocessor supervision in 3V/3.3V/5V systems-delivering precision reset thresholds, guaranteed timing, and robust noise immunity without external components.

FAQ

What is the exact reset threshold voltage of the MAX709RCPA?

The MAX709RCPA has a nominal reset threshold of 2.63V, with a guaranteed range of 2.55V to 2.70V over the full 0°C to +70°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix R. The threshold remains stable across temperature, with normalized variation ≤±0.5%.

Does the MAX709RCPA require external components to function?

No, the MAX709RCPA requires no external components to perform basic power-supply monitoring and reset generation. Its internal voltage reference, comparator, and 140ms timing circuit are fully integrated. A pull-up resistor on the RESET pin is recommended for proper logic level definition, but it is not required for core functionality-only for interface compatibility with specific µP inputs.

Can the MAX709RCPA operate reliably with a 3.0V supply rail?

Yes, the MAX709RCPA is explicitly rated for 3.0V and 3.3V systems. Its 2.63V reset threshold provides appropriate headroom above common 3.0V LDO outputs, and its VCC operating range extends down to 1.0V-ensuring the RESET output remains valid and asserted even as the supply decays well below nominal voltage.

What is the maximum allowable negative VCC transient duration the MAX709RCPA can ignore?

At 100mV overdrive (i.e., VCC dropping 100mV below the 2.63V threshold), the MAX709RCPA typically ignores transients ≤40µs in duration. This immunity is confirmed in the Typical Operating Characteristics graph "Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive", and applies specifically to the MAX709R/S/T versions including MAX709RCPA.

Is the MAX709RCPA pin-compatible with other MAX709 variants like MAX709SCPA or MAX709TCSA?

Yes, all MAX709 variants-including MAX709RCPA, MAX709SCPA, and MAX709TCSA-share identical pinouts and package footprints across DIP, SO, and µMAX packages. The only differences are reset threshold voltage (R=2.63V, S=2.93V, T=3.08V) and temperature grade (C=0°C to +70°C, E=−40°C to +85°C); electrical and mechanical compatibility is maintained within each package type.