Analog Devices Inc./Maxim Integrated MAX6708SKA

Overview

MAX6708SKA from Maxim Integrated is a dual-output microprocessor supervisory circuit in an 8-pin SOT23 package, providing complementary active-low and active-high reset outputs (RESET and RESET), a 0.62V precision power-fail comparator input (PFI), and a dedicated power-fail output (PFO). It monitors a single supply voltage with factory-trimmed reset threshold (4.63V for suffix 'L'), guarantees valid reset operation down to VCC = 1V, and supports critical µP power monitoring in automotive and industrial control systems.

For engineers reviewing the MAX6708SKA datasheet, MAX6708SKA pinout, MAX6708SKA application, or MAX6708SKA equivalent, this page delivers verified functional identity, confirmed dual-reset architecture, precise PFI/PFO timing behavior, and validated alternative options for multivoltage supervision without watchdog functionality.

Technical Context

The MAX6708SKA implements a dual-stage reset generator with independent push-pull outputs: one active-low (RESET) and one active-high (RESET), both asserted simultaneously during VCC brownout, power-up, or manual reset. Its internal 0.62V reference enables accurate power-fail detection via external resistor dividers on PFI, with PFO asserting low when PFI falls below threshold.

Unlike MAX6701–MAX6707 variants, the MAX6708SKA omits the watchdog timer and WDI/WDO pins entirely - confirmed by pin configuration tables and functional diagrams. It retains MR (manual reset), VCC, GND, PFI, PFO, and dual RESET outputs across pins 1–8, with no internal watchdog logic or timing circuitry present.

Key Specifications

Pinout & Package

MAX6708SKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA compliant), with 1.95mm × 2.80mm footprint, 0.65mm pitch, and 0.90mm max height. Pin 1 marked by dot; leads coplanar within 4 mils.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6704SKA and TPS3808G33DBVR, the MAX6708SKA uniquely delivers dual complementary reset outputs and integrated PFI/PFO functionality without watchdog overhead - making it optimal for deterministic, multi-signal reset coordination in space-constrained industrial and automotive systems.

Availability

MAX6708SKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, smart energy meters, and medical diagnostic imaging controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6708SKA 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6701–MAX6708 family delivers compact, low-power µP supervision with configurable reset thresholds and integrated power-fail detection - engineered for reliability in harsh environments where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage for MAX6708SKA?

The 'L' suffix in MAX6708SKA specifies a nominal reset threshold of 4.63V, with ±1.5% tolerance over the full -40°C to +125°C operating range. This value is factory-trimmed and tested; it applies to the primary VCC monitor input and determines when the RESET and RESET outputs assert during falling VCC conditions.

Does MAX6708SKA include a watchdog timer function?

No, MAX6708SKA does not include a watchdog timer. Unlike MAX6701–MAX6707 variants, the MAX6708SKA omits WDI and WDO pins entirely and contains no internal watchdog circuitry - confirmed by its pin configuration table, functional diagram, and product description stating "MAX6708 is the same as the MAX6704 but without the watchdog timer function."

How do the dual RESET outputs on MAX6708SKA behave during a reset event?

During any reset condition (VCC brownout, MR assertion, or power-up), MAX6708SKA asserts both RESET (pin 8, active-low) and RESET (pin 7, active-high) simultaneously. They remain asserted for the full 140–300ms timeout period after the fault clears, ensuring synchronized release of multiple downstream devices without external logic.

Can MAX6708SKA monitor voltages other than VCC?

Yes, MAX6708SKA can monitor secondary supplies using the PFI pin. By connecting an external resistor divider to PFI, users set a custom trip point referenced to the internal 0.62V comparator threshold - for example, a 2.2V rail trips PFO when PFI falls below 0.62V, corresponding to ~2.2V input via appropriate R1/R2 ratio.

What is the purpose of the NC pin (pin 6) on MAX6708SKA?

Pin 6 on MAX6708SKA is designated N.C. (No Connection) and is not internally bonded. It must be left unconnected or tied to GND/VCC per PCB layout guidelines - it serves no electrical function and has no impact on device operation or timing behavior.