Analog Devices Inc./Maxim Integrated MAX6717UKZWD3+

Overview

MAX6717UKZWD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (1.62V threshold) and VCC2 (2.313V threshold) with 210ms reset timeout, open-drain RST output, manual reset input, and watchdog timer. It ensures reliable system boot and brownout recovery in battery-powered embedded controllers.

For engineers reviewing the MAX6717UKZWD3+ datasheet, MAX6717UKZWD3+ pinout, MAX6717UKZWD3+ application, or MAX6717UKZWD3+ equivalent, key selection criteria include dual-supply monitoring range (1.8V–5.0V / 0.9V–3.3V), guaranteed reset validity down to VCC = 0.8V, 14µA typical supply current at 3.6V, and watchdog startup/normal modes (35s min / 1.12s min).

Technical Context

The MAX6717UKZWD3+ integrates two independent voltage comparators with factory-trimmed thresholds (VTH1 = 1.62V, VTH2 = 2.313V), a 210ms minimum reset timeout timer, and a dual-mode watchdog (35s startup + 1.12s normal). It asserts an active-low open-drain RST when either VCC1 or VCC2 falls below its threshold or MR is pulled low.

Its internal 50kΩ MR pullup, 626mV RSTIN reference (unused here), and immunity to sub-20µs VCC transients support robust operation in noisy, low-power systems. The device operates over –40°C to +85°C and guarantees valid reset logic state with VCC1 or VCC2 ≥ 0.8V.

Key Specifications

Pinout & Package

MAX6717UKZWD3+ uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and IoT devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6715UTLTD3+, MAX6717UKZWD3+ enables compact 1.8V/2.5V system supervision without external resistors, while TPS3808G18DBVR reduces current but forces designers to implement secondary monitoring externally - increasing risk of timing mismatch and board area.

Availability

MAX6717UKZWD3+ is available at Aetrix Electronics and suitable for industrial PLCs, medical wearables, telecom ONUs, and automotive BCMs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6717UKZWD3+ 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, sensing, and interface applications, with deep expertise in ultra-low-power supervision and reliability-critical systems.

The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing simultaneous, factory-trimmed monitoring of primary and secondary rails - targeting space-constrained, battery-sensitive, and industrial-grade applications.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6717UKZWD3+?

The MAX6717UKZWD3+ has factory-trimmed reset thresholds of 1.62V (typ) for VCC1 and 2.313V (typ) for VCC2, as defined by the 'Z' suffix in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over –40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco, enabling precise supervision of 1.8V and 2.5V rails without external calibration. The MAX6717UKZWD3+ does not support adjustable thresholds - all monitoring is fixed at these two levels.

Does the MAX6717UKZWD3+ support triple-voltage monitoring via RSTIN?

No, the MAX6717UKZWD3+ does not support RSTIN-based third-voltage monitoring. Although the MAX6719/MAX6720/MAX6723–MAX6727 variants include RSTIN functionality, the MAX6717UKZWD3+ is a dual-supply-only device per the Selector Guide. Its pinout lacks RSTIN connectivity, and the internal 626mV reference is unused. For triple-voltage supervision, consider MAX6719UTZWD3+ or MAX6723UTZWD3+, which allocate Pin 5 to RSTIN instead of VCC2.

What is the watchdog timeout behavior of the MAX6717UKZWD3+ during system startup?

The MAX6717UKZWD3+ implements a dual-mode watchdog: after any reset event (power-up, MR assertion, or brownout), it enters a 35s minimum startup period to allow full system initialization, then switches to a 1.12s minimum normal timeout period upon the first valid WDI transition. This prevents false timeouts during boot while ensuring rapid fault detection during runtime. The MAX6717UKZWD3+ watchdog requires no configuration - timing is fully internal and factory-calibrated.

Can the MAX6717UKZWD3+ operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?

Yes, the MAX6717UKZWD3+ supports VCC1 as low as 1.8V and VCC2 as low as 0.9V per its Absolute Maximum Ratings and Electrical Characteristics tables. At VCC1 = 1.8V and VCC2 = 1.2V, the device maintains guaranteed reset assertion when either rail falls below its threshold (1.62V / 2.313V), and the RST output remains valid down to VCC1 or VCC2 = 0.8V. Supply current increases only marginally - 15µA typical at 1.8V - preserving battery life in ultra-low-voltage designs.

Is the MAX6717UKZWD3+ pin-compatible with other MAX67xx SOT23-5 variants?

Yes, all MAX6715–MAX6718 UK-series 5-pin SOT23-5 devices share identical pinout: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1. This allows direct substitution within the same package footprint when threshold or timeout requirements change - for example, replacing MAX6717UKZWD3+ with MAX6718UKZWD3+ swaps open-drain RST for push-pull RST without PCB modification. However, functional differences (e.g., watchdog presence) must still be verified in the system design.