Analog Devices Inc./Maxim Integrated MAX6715UTYDD3

Overview

MAX6715UTYDD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) supply rails with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, and push-pull active-low RST output. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and supports manual reset input (MR) for system-level fault recovery in battery-powered telecom and embedded control systems.

For engineers reviewing the MAX6715UTYDD3 datasheet, MAX6715UTYDD3 pinout, MAX6715UTYDD3 application, or MAX6715UTYDD3 equivalent, key selection criteria include dual-supply monitoring capability, guaranteed reset validity at ultra-low VCC (0.8V), push-pull RST output logic compatibility with 3.3V/5V µP interfaces, and 210ms reset timeout alignment with boot sequence timing requirements.

Technical Context

The MAX6715UTYDD3 implements independent voltage comparators for VCC1 and VCC2, each with ±0.5% threshold hysteresis and 20ppm/°C tempco, ensuring stable trip points across -40°C to +85°C. Its internal reset timeout timer is fixed at 210ms (min), triggered upon any monitored supply falling below its threshold and held until all supplies exceed their thresholds plus hysteresis.

This device uses BiCMOS process technology (1072 transistors) and features an internal 50kΩ pullup on MR, enabling direct connection to momentary switches without external components. It asserts RST low when VCC1 < 4.625V or VCC2 < 3.075V, maintains reset for ≥210ms after recovery, and remains functional with either supply ≥0.8V - critical for brownout resilience in portable equipment.

Key Specifications

Pinout & Package

MAX6715UTYDD3 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), with gull-wing leads and RoHS-compliant lead-free finish. Pin 1 is marked by a dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6715UTYDD3, MAX6716UTLTD3-T offers identical voltage thresholds and timing but requires external pullup due to open-drain output, while TPS3808G33DBVR reduces supply current by 90% but sacrifices dual-supply monitoring capability - making MAX6715UTYDD3 the only option meeting both 2-rail supervision and push-pull drive requirements.

Availability

MAX6715UTYDD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, portable medical devices, and consumer set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed reset behavior under brownout conditions.

Supply support for MAX6715UTYDD3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage dual/triple-supply monitoring in space-constrained, battery-sensitive applications - delivering guaranteed reset validity down to 0.8V with minimal quiescent current.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6715UTYDD3?

The MAX6715UTYDD3 has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, with ±0.125V tolerance over temperature. These values are encoded in the "YD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and confirmed in the Electrical Characteristics table of the MAX6715–MAX6729 datasheet. The MAX6715UTYDD3 does not support adjustable thresholds - only factory-set dual-voltage monitoring.

Does MAX6715UTYDD3 support watchdog timer functionality?

No, MAX6715UTYDD3 does not include a watchdog timer. Per the Selector Guide, only MAX6721 through MAX6729 variants feature WDI input; MAX6715UTYDD3 is a basic dual-supply supervisor with MR input and push-pull RST output only. For watchdog capability, consider MAX6722UTLTD3-T - which shares the same thresholds, timeout, and package but adds watchdog input.

Can MAX6715UTYDD3 monitor a third voltage rail like VCC3?

No, MAX6715UTYDD3 is strictly a dual-voltage supervisor. It monitors only VCC1 and VCC2. Third-rail monitoring requires variants such as MAX6719UTYDD3 or MAX6720UTYDD3, which include the RSTIN pin for externally adjustable threshold (0.626V reference). The MAX6715UTYDD3 pinout omits RSTIN and has no internal circuitry for auxiliary voltage supervision.

What is the function of Pin 6 on MAX6715UTYDD3?

Pin 6 on MAX6715UTYDD3 is NC (No Connect) - it is internally unconnected and must remain floating or tied to GND per Maxim's layout recommendations. This differs from other variants like MAX6719/MAX6720 (which use Pin 6 for RSTIN) or MAX6728/MAX6729 (which use it for PFI). Confusion may arise from shared family pinouts, but MAX6715UTYDD3 datasheet explicitly lists Pin 6 as NC in the Pin Description table.

Is MAX6715UTYDD3 compatible with 1.8V core supplies?

Yes, MAX6715UTYDD3 supports VCC2 monitoring down to 0.9V and guarantees valid reset operation when VCC2 ≥ 0.8V - making it compatible with 1.8V core supplies as the secondary rail. However, its VCC2 threshold is fixed at 3.075V, so it cannot supervise the 1.8V rail directly; instead, it supervises a higher intermediate rail (e.g., 3.3V) that powers the 1.8V regulator. For direct 1.8V supervision, select a variant with lower VTH2 (e.g., "W" suffix = 1.665V).