Analog Devices Inc./Maxim Integrated MAX6715UTZWD3+

Overview

MAX6715UTZWD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, watchdog timer, manual reset input, and guaranteed reset validity down to 0.8V supply - used in telecom power sequencing and server board management.

For engineers reviewing the MAX6715UTZWD3+ datasheet, MAX6715UTZWD3+ pinout, MAX6715UTZWD3+ application, or MAX6715UTZWD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), 14µA typical supply current at 3.6V, open-drain RST output referenced to VCC1, and immunity to sub-20µs VCC transients.

Technical Context

The MAX6715UTZWD3+ implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.625V and 3.075V), 20ppm/°C tempco, and 0.5% hysteresis. Reset assertion occurs on first fault detection and remains active for a guaranteed minimum 210ms after all monitored supplies exceed thresholds.

It integrates a dual-mode watchdog timer: 35s startup period after reset, followed by 1.12s normal timeout; WDI edge-triggered reset clearing; and MR input with internal 50kΩ pullup to VCC1, 1µs minimum pulse width, and 100ns glitch rejection.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, 1.6mm × 2.9mm footprint, 0.95mm height, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6715UTZWD3+, MAX6315US46D3+ omits VCC2 monitoring and watchdog capability, limiting use to simpler systems; TPS3808G33DBVR lacks dual-threshold flexibility and manual reset, requiring supplemental circuitry for full functionality.

Availability

MAX6715UTZWD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, server board management, and industrial PLC controller designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6715UTZWD3+ 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, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems requiring precise, low-power, dual- or triple-rail supervision with integrated watchdog and manual reset - targeting space-constrained telecom and server applications.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6715UTZWD3+?

The MAX6715UTZWD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating range and 0.5% hysteresis. These values are encoded in the "TZ" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified in the Electrical Characteristics table of the official datasheet.

Does the MAX6715UTZWD3+ support watchdog functionality, and what are its timing modes?

Yes, the MAX6715UTZWD3+ includes a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal-mode timeout. The watchdog clears on any rising or falling edge at the WDI pin, enabling robust software execution monitoring without false triggers during boot sequences.

What is the reset output configuration of the MAX6715UTZWD3+, and how should it be interfaced?

The MAX6715UTZWD3+ features an active-low open-drain RST output referenced to VCC1. It requires an external pullup resistor (typically 10kΩ to VCC1 or system rail) and is compatible with bidirectional µP reset pins. The output sinks ≤3.2mA at VCC1 ≥ 4.5V and maintains VOL ≤ 0.4V, ensuring reliable logic-level compatibility across voltage domains.

How does the MAX6715UTZWD3+ ensure valid reset operation during deep brownout conditions?

The MAX6715UTZWD3+ guarantees correct RST logic state down to VCC1 or VCC2 = 0.8V - verified across temperature and process corners. This ensures deterministic reset assertion even during severe supply droop, supporting safe shutdown protocols in telecom and industrial systems where partial power loss must trigger controlled recovery.

Is the MAX6715UTZWD3+ pin-compatible with other devices in the MAX6715–MAX6729 family?

No - the MAX6715UTZWD3+ uses a 6-pin SOT23-6 package with specific pinout (RST, GND, MR, VCC2, VCC1, WDI). While other family members share the same package footprint, pin functions differ significantly (e.g., MAX6719 adds RSTIN, MAX6728 adds PFI/PFO). Direct substitution requires verification of pin mapping, feature set, and threshold suffixes.