Analog Devices Inc./Maxim Integrated MAX6707YKA-T

Overview

MAX6707YKA-T from Maxim Integrated is a single-supply microprocessor supervisory IC in 8-pin SOT23 package, providing active-low open-drain 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 = 1.2V. It monitors +2.12V to +2.25V supply rails in white goods and telecom power management systems.

For engineers reviewing the MAX6707YKA-T datasheet, MAX6707YKA-T pinout, MAX6707YKA-T application, or MAX6707YKA-T equivalent, this device supports precise low-voltage µP supervision with integrated PFI/PFO, WDI/WDO independence, and temperature-stable reset threshold (±60 ppm/°C) across -40°C to +125°C.

Technical Context

The MAX6707YKA-T implements a dual-comparator architecture: one for VCC monitoring (threshold = 2.19V typ at +25°C, ±3% over temp), another for external voltage supervision via PFI (0.62V reference). Its watchdog circuit asserts WDO low after 1.6s of WDI inactivity and clears on any edge transition - not just rising edges - enabling robust µP activity verification.

Reset generation uses an internal 140ms timeout timer that holds RESET low after VCC recovery, with immunity to sub-100ns MR glitches and guaranteed VOL ≤ 0.3V at ISINK = 50µA. The open-drain RESET and WDO outputs support flexible pull-up configurations, while PFO mirrors PFI status with <1µs propagation delay.

Key Specifications

Pinout & Package

Package: 8-pin SOT23, 1.6mm × 2.9mm footprint, lead-free (RoHS-compliant), rated for -40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6707YKA-T, MAX6707AKA-T offers faster WDO recovery but identical reset behavior, while TPS3808G12QDBVRQ1 provides automotive qualification at the cost of missing adjustable power-fail monitoring - making MAX6707YKA-T optimal for multi-rail industrial telecom systems needing both precision low-voltage reset and early power-fail signaling.

Availability

MAX6707YKA-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 MAX6707YKA-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 communication applications.

The MAX6701–MAX6708 family delivers compact, low-power µP supervision for space-constrained embedded systems requiring multi-threshold monitoring and fail-safe watchdog coverage.

FAQ

What is the exact reset threshold voltage of MAX6707YKA-T and how does it vary with temperature?

The MAX6707YKA-T has a nominal VCC reset threshold of 2.19V at +25°C, with a guaranteed range of 2.11V to 2.27V over -40°C to +125°C. Its temperature coefficient is ±60 ppm/°C, meaning threshold drift is bounded to ±0.75mV per 10°C change - critical for stable operation in thermal-cycling environments like telecom base stations where MAX6707YKA-T is deployed.

Does MAX6707YKA-T support monitoring of voltages other than VCC?

Yes, MAX6707YKA-T supports external voltage monitoring via its PFI pin, which connects to an internal 0.62V reference comparator. By adding a resistor divider from the target rail to PFI, users can configure early power-fail detection for secondary supplies (e.g., 5V, 3.3V, or 1.8V rails). This capability is explicitly confirmed in the MAX6707YKA-T datasheet's "Power-Fail Comparator" section and typical operating circuits.

What is the function of the N.C. pin (Pin 6) on MAX6707YKA-T and how should it be handled?

Pin 6 on MAX6707YKA-T is designated N.C. (No Connection) and is not internally bonded. The datasheet mandates that this pin remain unconnected - neither tied to GND nor VCC. Leaving it floating is acceptable due to its lack of internal connection, but routing traces or solder pads to it must be avoided to prevent accidental shorts or parasitic coupling that could affect adjacent pins like PFO or RESET.

How does the watchdog timer in MAX6707YKA-T interact with the reset output?

The MAX6707YKA-T watchdog timer operates independently of the reset generator: WDO asserts low on timeout but does not affect RESET unless externally wired (e.g., connecting WDO to MR). In contrast, VCC undervoltage directly asserts both RESET and WDO simultaneously. This separation allows designers to use WDO for non-reset fault signaling (e.g., NMI interrupt) while maintaining clean power-on reset timing - a key feature confirmed in the MAX6707YKA-T functional diagrams and timing waveforms.

Can MAX6707YKA-T be used in systems with supply voltages below 2.1V?

No - MAX6707YKA-T is specified for operation down to VCC = 1.2V, but its reset threshold is fixed at 2.19V (Y-suffix). If VCC falls below 2.11V (minimum threshold), RESET asserts and remains asserted until VCC rises above 2.27V (maximum threshold). Therefore, it cannot supervise rails below ~2.1V; for lower voltages, alternate suffixes (e.g., Z = 2.32V, R = 2.63V) or different families like MAX6326 would be required. This limitation is explicitly defined in the MAX6707YKA-T Electrical Characteristics table.