Analog Devices Inc./Maxim Integrated MAX6705YKA+

Overview

MAX6705YKA+ from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, adjustable power-fail comparator (0.62V threshold), manual reset input, and guaranteed reset validity down to VCC = 1V. It monitors +2.12V to +2.25V supply rails in industrial embedded controllers and white goods power management.

For engineers reviewing the MAX6705YKA+ datasheet, MAX6705YKA+ pinout, MAX6705YKA+ application, or MAX6705YKA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing (140ms timeout), power-fail detection capability, and validated alternative options for voltage supervision in critical µP systems operating at 2.1–2.25V nominal rails.

Technical Context

The MAX6705YKA+ implements a dedicated reset generator with internal 140ms timeout counter, a separate watchdog timer that asserts WDO low after 1.6s of no WDI edge transition, and an independent power-fail comparator with externally adjustable threshold via PFI (0.62V reference) and active-low push-pull PFO output. Its reset logic responds to VCC falling below 2.19V (typ), MR assertion, or watchdog timeout - all while maintaining guaranteed RESET assertion down to VCC = 1V.

This A-version device features non-latching WDO behavior: WDO deasserts immediately when VCC recovers above threshold (no timeout delay), unlike standard versions. It supports only single-voltage supervision (VCC only), excludes RST_IN1/RST_IN2 inputs, and uses Y-suffix threshold (2.19V typ at +25°C, ±30mV over –40°C to +125°C).

Key Specifications

Pinout & Package

MAX6705YKA+ is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and RoHS-compliant lead-free construction (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6705YKA-T, the + version offers identical electrical performance with RoHS-compliant termination; compared with TPS3808G12QDBVRQ1, MAX6705YKA+ provides precise 2.19V supervision, integrated power-fail warning, and independent watchdog output - making it superior for industrial 2.2V systems needing full feature set.

Availability

MAX6705YKA+ is available at Aetrix Electronics and suitable for industrial controllers, white goods power management, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6705YKA+ 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 industrial, communications, and computing applications, with emphasis on reliability and integration.

The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, high-reliability systems - delivering reset, watchdog, and power-fail functions in a single 8-pin SOT23 package.

FAQ

What is the exact reset threshold voltage of MAX6705YKA+ and how does it vary with temperature?

The MAX6705YKA+ has a nominal reset threshold of 2.19V at +25°C, with a guaranteed range of 2.11V to 2.27V over the full –40°C to +125°C operating temperature range. Its temperature coefficient is 60ppm/°C, meaning threshold drift is ≤±12mV across the entire temperature span. This precision enables reliable brownout detection in 2.2V systems without external calibration.

Does MAX6705YKA+ support monitoring multiple supply voltages like VCC, VDDIO, and AVCC simultaneously?

No, MAX6705YKA+ monitors only the VCC supply voltage. It belongs to the MAX6705(A)/MAX6706(A)/MAX6707(A) subgroup, which provides single-supply supervision with PFI/PFO and watchdog - unlike MAX6701(A)/MAX6702(A)/MAX6703(A) variants that include RST_IN1 and RST_IN2 for triple-voltage monitoring. For multi-rail supervision, separate supervisors or a different variant must be used.

How does the watchdog behavior of MAX6705YKA+ differ from the non-A version MAX6705YKA-T?

MAX6705YKA+ (A-version) features non-latching WDO: it deasserts immediately when VCC recovers above threshold, with no timeout delay. In contrast, the standard MAX6705YKA-T latches WDO low until a valid WDI edge is detected - even after VCC recovery. This makes the A-version more responsive for fast-recovery systems where immediate watchdog reset clearance is required after transient faults.

Can MAX6705YKA+ generate a reset pulse from a power-fail condition without external components?

Yes - by connecting PFO to MR, MAX6705YKA+ can autonomously generate a full reset pulse when PFI drops below 0.62V. This requires only one external connection and leverages the internal power-fail comparator. The resulting RESET pulse duration matches the 140–300ms timeout period, enabling orderly shutdown without additional logic or timers.

Is the RESET output of MAX6705YKA+ compatible with 1.8V logic interfaces?

Yes - the active-low push-pull RESET output of MAX6705YKA+ drives to ≤0.3V when asserted (ISINK = 50µA, VCC ≥ 1.0V), well below the 0.45V VIH maximum for 1.8V CMOS inputs. When deasserted, VOH ≥ 0.8 × VCC, ensuring solid high-level compatibility across its 1.0–5.5V operating range. No level-shifting circuitry is needed for 1.8V µP reset inputs.