Analog Devices Inc./Maxim Integrated MAX6715UTTGD3+T

Overview

MAX6715UTTGD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power sequencing and server board management.

For engineers reviewing the MAX6715UTTGD3+T datasheet, MAX6715UTTGD3+T pinout, MAX6715UTTGD3+T application, or MAX6715UTTGD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA typical supply current at 3.6V, open-drain active-low RST output referenced to VCC1, and immunity to sub-20µs VCC transients.

Technical Context

The MAX6715UTTGD3+T implements independent voltage comparators for VCC1 and VCC2, each with 20ppm/°C tempco and 0.5% hysteresis referenced to typical threshold. Reset assertion occurs on first fault detection and remains latched for the full 210ms timeout after all monitored supplies recover above their thresholds.

It features an internal 50kΩ pullup on MR, supports manual reset pulse widths ≥1µs, and guarantees correct RST logic state even when VCC1 or VCC2 drops to 0.8V - enabling robust brownout detection in battery-backed systems without external biasing.

Key Specifications

Pinout & Package

MAX6715UTTGD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with dot; pinout follows standard SOT23 orientation with GND at pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6715UTTGD3+T, MAX6316US46D3+T reduces footprint but sacrifices secondary rail monitoring, while TPS3808G33DBVR offers timeout flexibility at the cost of dual-supply functionality and higher current draw - making MAX6715UTTGD3+T optimal for fixed-threshold, dual-rail integrity assurance.

Availability

MAX6715UTTGD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, server board management, and industrial PLC controllers requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX6715UTTGD3+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, sensing, and interface applications, with emphasis on high-reliability industrial and communications systems.

The MAX6715–MAX6729 family delivers ultra-low-voltage dual/triple supervisory functions targeting multirail systems where simultaneous supply monitoring, minimal quiescent current, and guaranteed reset validity at low VCC are critical design requirements.

FAQ

What are the exact reset threshold voltages for MAX6715UTTGD3+T?

The MAX6715UTTGD3+T has factory-trimmed reset thresholds of 4.625V (VTH1, primary supply) and 3.075V (VTH2, secondary supply), with ±1.5% tolerance over -40°C to +85°C. These values are encoded in the "TG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are confirmed in the Electrical Characteristics table of the official datasheet. The MAX6715UTTGD3+T does not support adjustable thresholds or RSTIN/PFI inputs.

Does MAX6715UTTGD3+T support watchdog or power-fail functionality?

No, MAX6715UTTGD3+T is a basic dual-supply supervisor without watchdog timer (WDI), power-fail input (PFI), or power-fail output (PFO) features. Per the Selector Guide, only MAX6721–MAX6729 variants include WDI, and only MAX6728/MAX6729 include PFI/PFO. The MAX6715UTTGD3+T provides only VCC1/VCC2 monitoring, MR input, and open-drain RST output.

What is the function of Pin 6 on MAX6715UTTGD3+T?

Pin 6 of the MAX6715UTTGD3+T is a no-connect (NC) terminal - it is internally unconnected and must be left floating or tied to GND per PCB layout best practices. This differs from other MAX67xx variants (e.g., MAX6719) that use Pin 6 for RSTIN. The MAX6715UTTGD3+T pinout is strictly 6-pin SOT23 with pins 1–5 assigned to RST, GND, MR, VCC2, and VCC1 respectively.

Can MAX6715UTTGD3+T operate with VCC1 = 1.8V and VCC2 = 1.2V?

Yes, MAX6715UTTGD3+T supports VCC1 from 1.8V to 5.0V and VCC2 from 0.9V to 3.3V, so 1.8V/1.2V operation is within specification. However, its fixed thresholds (4.625V/3.075V) mean it will only assert reset if those specific rails exceed their rated ranges - thus this configuration is valid electrically but functionally mismatched unless VCC1 and VCC2 are higher rails. For 1.8V/1.2V systems, a different variant (e.g., MAX6718) with lower thresholds would be appropriate.

What is the maximum transient immunity of MAX6715UTTGD3+T on VCC1?

The MAX6715UTTGD3+T is immune to negative-going VCC transients ≤20µs in duration when the overdrive (drop below threshold) is ≥100mV, as shown in Figure toc06 of the datasheet. Its architecture rejects short glitches without false resets, and a 0.1µF bypass capacitor placed near the VCC1 pin further enhances immunity - critical for noisy industrial power environments where MAX6715UTTGD3+T maintains deterministic reset behavior.