Analog Devices Inc./Maxim Integrated MAX6708SKA+T

Overview

MAX6708SKA+T from Maxim Integrated is a precision microprocessor supervisory IC in an 8-pin SOT23 package, providing dual active-low/active-high push-pull reset outputs, a 0.62V power-fail comparator input (PFI), and a dedicated power-fail output (PFO). It monitors +3.3V supply voltage with a 2.93V reset threshold (S-suffix), guarantees valid reset down to VCC = 1V, and features a 140ms reset timeout delay. It is used in critical µP power monitoring for white goods and telecom infrastructure where reliable brownout detection and manual reset coordination are required.

For engineers reviewing the MAX6708SKA+T datasheet, MAX6708SKA+T pinout, MAX6708SKA+T application, or MAX6708SKA+T equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset threshold (2.93V), PFI/PFO comparator behavior, and two validated alternative parts - all extracted from Maxim's official MAX6701–MAX6708 family documentation.

Technical Context

The MAX6708SKA+T implements a dual-output reset architecture: one active-low RESET and one active-high RESET (complementary), both push-pull, enabling direct interface with µP reset inputs requiring either polarity. Its internal 0.62V reference drives the PFI comparator, allowing precise external voltage monitoring via resistive dividers - critical for early power-fail warning in multi-rail systems.

Unlike watchdog-equipped variants (e.g., MAX6704), the MAX6708SKA+T omits the watchdog timer and WDI/WDO circuitry entirely, simplifying design where system-level supervision suffices without runtime activity monitoring. It retains full MR (manual reset) functionality with internal 50kΩ pullup and guaranteed reset assertion during VCC brownout, power-up, and MR assertion.

Key Specifications

Pinout & Package

MAX6708SKA+T is housed in an 8-pin SOT23 package (package code K8+2), surface-mount, RoHS-compliant, with 0.65mm pitch and thermal pad omitted. Pin 1 is MR (manual reset input), Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is N.C., Pin 7 is RESET (active-low), Pin 8 is RESET (active-high).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6704SKA+T, MAX6708SKA+T removes watchdog circuitry to reduce quiescent current and simplify layout; compared with TPS3808G33DBVR, it adds PFI/PFO and dual-reset outputs - making it uniquely suited for multi-function supervision in industrial and telecom equipment.

Availability

MAX6708SKA+T is available at Aetrix Electronics and suitable for white goods, telecommunications infrastructure, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6708SKA+T 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 ICs for industrial, communications, computing, and consumer applications.

The MAX6701–MAX6708 family targets compact, low-power microprocessor supervision - delivering integrated reset, power-fail warning, and manual reset in minimal SOT23 footprint for space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for MAX6708SKA+T?

The MAX6708SKA+T has a nominal reset threshold of 2.93V (S-suffix), with guaranteed limits of 2.83V to 3.02V over -40°C to +125°C. This value is factory-trimmed and applies to the VCC supply monitoring function. The threshold is temperature-compensated at 60ppm/°C, ensuring stability across industrial operating conditions.

Does MAX6708SKA+T include a watchdog timer?

No, the MAX6708SKA+T does not include a watchdog timer. It is explicitly defined in the datasheet as "the same as the MAX6704 but without the watchdog timer function." Unlike MAX6704SKA+T or MAX6705SKA+T, MAX6708SKA+T lacks WDI and WDO pins and associated timing circuitry - simplifying design where runtime µP activity monitoring is unnecessary.

What are the functions of Pins 7 and 8 on MAX6708SKA+T?

Pin 7 is the active-low RESET output (push-pull), and Pin 8 is the active-high RESET output (push-pull). These complementary signals are asserted simultaneously during power-up, brownout, or MR activation. Both outputs drive directly into standard µP reset inputs without external components - eliminating need for inverters or pull resistors.

Can MAX6708SKA+T monitor voltages other than VCC?

Yes, MAX6708SKA+T can monitor secondary voltages via its PFI pin. By connecting an external resistor divider between the target voltage (e.g., +12V) and GND, with the midpoint fed to PFI, the internal 0.62V comparator detects when that voltage drops below the calculated trip point. PFO then asserts to signal power-fail condition to the µP.

Is MAX6708SKA+T compatible with lead-free PCB assembly processes?

Yes, MAX6708SKA+T is RoHS-compliant and rated for lead-free reflow soldering. The "+T" suffix explicitly denotes lead-free tape-and-reel packaging. It supports JEDEC-standard reflow profiles, including peak temperatures up to +260°C, and is qualified per J-STD-020 moisture sensitivity level 1 (MSL-1), requiring no baking prior to assembly.