Analog Devices Inc./Maxim Integrated MAX708TCPA+

Overview

MAX708TCPA+ from Maxim Integrated is a +3V microprocessor supervisory circuit with active-high and active-low reset outputs, 3.08V reset threshold, 200ms reset pulse width, and 1.25V power-fail comparator input-designed for reliable power-up/power-down monitoring in battery-powered portable instruments and embedded controllers.

For engineers reviewing the MAX708TCPA+ datasheet, MAX708TCPA+ pinout, MAX708TCPA+ application, or MAX708TCPA+ equivalent, this device delivers dual-reset signaling, brownout immunity down to VCC = 1V, low-quiescent-current supervision (100µA), and robust manual reset debouncing-key for industrial and portable system reliability validation.

Technical Context

The MAX708TCPA+ integrates a precision voltage monitor, dual-reset generator (RESET and RESET), power-fail comparator (PFI/PFO), and debounced manual reset input (MR) in a single 8-pin PDIP package. It operates across 1.2V to 5.5V supply range and guarantees RESET assertion down to VCC = 1V.

Unlike MAX706 variants, MAX708 devices omit the watchdog timer and instead provide complementary reset outputs-enabling direct interface to µPs requiring either active-high or active-low reset logic without external inversion. The 3.08V reset threshold is factory-trimmed with ±15mV accuracy and 20mV hysteresis.

Key Specifications

Pinout & Package

MAX708TCPA+ is housed in an 8-pin plastic DIP (PDIP) package (package code P8-1), lead-free compliant, with 0.3" body width and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX708TCPA+, MAX708TCSA+ offers identical supervision functionality in SO packaging for reflow assembly, while MAX708TCUA+ delivers the same features in a miniature µMAX package-enabling higher-density designs but requiring tighter layout controls for thermal and ESD management.

Availability

MAX708TCPA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial controller design, and medical diagnostics equipment requiring stable component supply and long-term lifecycle support.

Supply support for MAX708TCPA+ 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, automotive, and communications applications.

The MAX708 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust, low-power, dual-signaling reset generation in battery-operated and mission-critical embedded systems.

FAQ

What is the reset threshold voltage of the MAX708TCPA+?

The MAX708TCPA+ has a factory-trimmed reset threshold of 3.08V (±15mV) with 20mV hysteresis. This value is specified for VCC falling conditions and ensures reliable reset assertion in +3.3V systems during brownout events. The threshold is guaranteed over the full operating temperature range (0°C to +70°C) and supply voltage range (1.2V to 5.5V). MAX708TCPA+ does not include a watchdog timer-unlike MAX706 variants-making it ideal for applications requiring only precise voltage monitoring and dual-reset signaling.

Does the MAX708TCPA+ provide both active-high and active-low reset outputs?

Yes, the MAX708TCPA+ provides two independent reset outputs: RESET (active-high) and RESET (active-low). This dual-output architecture eliminates the need for external inverters when interfacing with microprocessors or FPGAs that require different reset polarities. Both outputs are asserted simultaneously during power-up, power-down, or brownout, and deassert after the 200ms reset timeout. MAX708TCPA+ achieves this without a watchdog function-distinguishing it from MAX706-series parts.

What is the purpose of the PFI and PFO pins on the MAX708TCPA+?

The PFI (Power-Fail Input) pin accepts a user-configurable voltage-typically from a resistive divider-to trigger the PFO (Power-Fail Output) when the monitored voltage falls below 1.25V. PFO is an open-drain, active-low output used for early-warning interrupts or cascaded reset initiation. In MAX708TCPA+, PFI supports nanoampere-level input current (<25nA), enabling high-impedance sensing of unregulated rails. Unlike the main reset function, PFI/PFO operates independently of VCC threshold detection.

Can the MAX708TCPA+ operate with a supply voltage lower than 3.08V?

Yes, the MAX708TCPA+ operates with supply voltages as low as 1.2V and guarantees RESET assertion down to VCC = 1V. While the 3.08V reset threshold defines the point at which reset is triggered during VCC fall, the device remains functional-and continues asserting reset-well below that level. This behavior ensures µP hold-down during deep brownout or battery depletion. MAX708TCPA+ draws only 100µA typical quiescent current at low VCC, supporting extended operation in energy-constrained systems.

Is the MAX708TCPA+ pin-compatible with other MAX708 variants?

Yes, all MAX708R/S/T variants-including MAX708TCPA+, MAX708TCSA+, and MAX708TCUA+-share identical pinouts and electrical functionality across PDIP, SO, and µMAX packages. The only differences are reset threshold (2.63V/2.93V/3.08V) and package type. MAX708TCPA+ uses the 8-pin PDIP (P8-1) package with lead-free finish. No PCB changes are required when substituting between same-threshold variants in the same package family.