Analog Devices Inc./Maxim Integrated MAX6708TKA

Overview

MAX6708TKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit 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 single-supply systems (e.g., +3.3V or +2.5V), guarantees valid reset down to VCC = 1V, and features a 140ms reset timeout delay. It is used in automotive control units and industrial embedded systems requiring reliable brownout detection and orderly shutdown.

For engineers reviewing the MAX6708TKA datasheet, MAX6708TKA pinout, MAX6708TKA application, or MAX6708TKA equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset threshold options (T-suffix = 3.08V), absence of watchdog timer, and validated alternative parts for dual-output µP supervision without WDO functionality.

Technical Context

The MAX6708TKA implements a dual-stage reset generator with independent active-low and active-high push-pull outputs driven by a single internal reset assertion event - triggered by VCC falling below its fixed threshold (3.08V), MR pull-down, or PFI falling below 0.62V. Its power-fail comparator operates independently with no hysteresis, enabling early warning signaling via PFO.

Unlike MAX6704, MAX6708TKA omits the watchdog timer entirely - no WDI or WDO pins are functional. The device supports operation across –40°C to +125°C and draws only 6–20µA supply current at VCC < 3.6V, making it suitable for low-power, high-reliability monitoring in constrained thermal environments.

Key Specifications

Pinout & Package

MAX6708TKA is housed in an 8-pin SOT23-8 package (JEDEC MO-178 BA), 3.00mm × 1.75mm × 1.30mm body, with gull-wing leads and coplanarity ≤ 0.1mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervision applications.

Compared with MAX6704TKA, MAX6708TKA removes watchdog circuitry to reduce pin count and simplify layout, while retaining identical dual-output timing and PFI/PFO functionality; versus TPS3808G33DBVR, MAX6708TKA provides complementary reset signals and early-warning capability essential for robust system-level power sequencing.

Availability

MAX6708TKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, white goods main boards, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6708TKA 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 warning - engineered for reliability in harsh environments where deterministic power sequencing is mission-critical.

FAQ

What is the reset threshold voltage for MAX6708TKA?

The MAX6708TKA has a fixed reset threshold of 3.08V (T-suffix), specified over –40°C to +125°C with ±3% tolerance. This value is factory-trimmed and guaranteed in production test. The threshold applies to the VCC supply monitoring function and determines the voltage level at which the MAX6708TKA asserts its dual reset outputs during power-down or brownout conditions.

Does MAX6708TKA include a watchdog timer?

No, MAX6708TKA does not include a watchdog timer. Unlike MAX6704TKA or MAX6705TKA, the MAX6708TKA omits the watchdog input (WDI) and watchdog output (WDO) functions entirely. Pin 6 is marked N.C. (no connection), and no internal watchdog circuitry is present - simplifying design for applications requiring only power supervision and power-fail warning.

What are the functions of the two RESET pins on MAX6708TKA?

MAX6708TKA provides two complementary reset outputs: pin 8 is active-low RESET (push-pull), and pin 7 is active-high RESET (push-pull). Both are asserted simultaneously during power-up, brownout, or MR activation. They remain asserted for the full 140ms reset timeout period and release together - eliminating timing skew between processor and peripheral logic reset domains.

Can MAX6708TKA monitor voltages other than VCC?

Yes, MAX6708TKA can monitor secondary supplies via 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. When the divided voltage falls below 0.62V, PFO asserts low - enabling early-warning detection of auxiliary rail collapse (e.g., 12V motor supply or 5V interface rail) independent of VCC monitoring.

What is the purpose of the N.C. pin on MAX6708TKA?

Pin 6 on MAX6708TKA is designated N.C. (No Connection) - it is not bonded to the die and has no internal circuit connection. It must be left unconnected on the PCB. This pin distinguishes MAX6708TKA from watchdog-enabled variants (e.g., MAX6705TKA) and reflects the removal of WDI functionality, reducing pin count and simplifying layout for applications that do not require watchdog supervision.