Analog Devices Inc./Maxim Integrated MAX6708YKA+T

Overview

MAX6708YKA+T from Maxim Integrated is a precision microprocessor supervisory IC in an 8-pin SOT23 package, designed for dual active-low/active-high reset generation in low-voltage systems. It monitors a single supply (2.12V–2.25V threshold), provides 140ms reset timeout, independent power-fail detection (0.62V PFI threshold), and guaranteed reset validity down to VCC = 1V. It is used in critical µP power monitoring for white goods and telecom infrastructure.

For engineers reviewing the MAX6708YKA+T datasheet, MAX6708YKA+T pinout, MAX6708YKA+T application, or MAX6708YKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing, power-fail comparator behavior, and validated alternatives - all specific to the Y-threshold, KA package, +T lead-free variant.

Technical Context

The MAX6708YKA+T implements a dual-output reset architecture: one active-low push-pull RESET and one active-high push-pull RESET, both asserted simultaneously during VCC brownout, power-up, or manual reset. Its internal 0.62V reference enables precise external voltage monitoring via the PFI input, with PFO delivering a corresponding open-drain or push-pull active-low signal.

Unlike watchdog-equipped variants (e.g., MAX6704), the MAX6708YKA+T omits the watchdog timer and WDI/WDO circuitry entirely - confirmed by functional diagram Figure 2 and Selector Guide. It supports operation from VCC = 1.2V to 5.5V and guarantees reset assertion at VCC ≥ 1V, with immunity to short falling transients.

Key Specifications

Pinout & Package

MAX6708YKA+T is housed in an 8-pin SOT23 package (JEDEC MO-178AA, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6704YKA+T, the MAX6708YKA+T removes watchdog circuitry to reduce complexity and layout area, while retaining identical reset accuracy and power-fail monitoring. Against TPS3808G12QDBVRQ1, it offers superior functionality (dual polarity, PFI/PFO) but targets industrial/commercial rather than automotive qualification.

Availability

MAX6708YKA+T is available at Aetrix Electronics and suitable for white goods, telecommunications infrastructure, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6708YKA+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 precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, computing, and communications systems.

The MAX6701–MAX6708 family delivers compact, low-power µP supervision with configurable reset thresholds and integrated power-fail detection - engineered for reliability-critical embedded systems where board space and supply margin are constrained.

FAQ

What is the exact reset threshold voltage for MAX6708YKA+T?

The MAX6708YKA+T has a nominal reset threshold of 2.19V at -40°C to +85°C, with guaranteed limits of 2.11V (min) and 2.27V (max) over the full -40°C to +125°C operating range. This Y-suffix threshold is specifically calibrated for 2.2V nominal supply monitoring and is confirmed in the Electrical Characteristics table under "VTH" for MAX670_Y/MAX670_AY versions.

Does MAX6708YKA+T include a watchdog timer?

No, the MAX6708YKA+T does not include a watchdog timer. Per the General Description and Functional Diagram Figure 2, the MAX6708 is explicitly defined as "the same as the MAX6704 but without the watchdog timer function." Pins 6 (WDI) and 8 (WDO) are unconnected (N.C.) in the MAX6708YKA+T pinout, and no watchdog timing parameters appear in its specification tables.

What are the functions of the two RESET pins on MAX6708YKA+T?

Pin 7 is the active-low RESET output (push-pull), and Pin 8 is the active-high RESET output (push-pull). Both assert simultaneously when VCC drops below threshold, MR is pulled low, or during power-up. This dual-output architecture allows direct interface to µPs requiring either polarity without external components - a key differentiator from single-output supervisors like the MAX6705 series.

Can MAX6708YKA+T monitor a secondary voltage such as 3.3V?

Yes, MAX6708YKA+T can monitor secondary voltages using its PFI input. Connect a resistor divider from the 3.3V rail to PFI so that the voltage at PFI equals 0.62V when the rail reaches its fail threshold (e.g., 3.0V). The internal 0.62V reference and 6mV hysteresis ensure accurate, noise-immune detection, and PFO provides a corresponding active-low output to trigger interrupts or auxiliary resets.

What is the reset timeout period for MAX6708YKA+T and how is it determined?

The MAX6708YKA+T has a guaranteed reset timeout period of 140ms (min) to 300ms (max) over temperature. This is a fixed internal timer - not adjustable externally - and begins counting once reset conditions (e.g., VCC falling below threshold) are met. The timeout ensures the µP remains held in reset long enough for clocks and supplies to stabilize before release, meeting industry-standard boot reliability requirements.