Analog Devices Inc./Maxim Integrated MAX6730UTVD3+

Overview

MAX6730UTVD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, manual reset input, and independent watchdog timer featuring 54s startup delay and 1.68s normal timeout. It monitors VCC1 at factory-set +4.625V threshold (suffix 'TV'), provides 140–280ms reset timeout (D3), and guarantees valid reset down to VCC1 = +0.8V. It is used in telecom power sequencing and embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6730UTVD3+ datasheet, MAX6730UTVD3+ pinout, MAX6730UTVD3+ application, or MAX6730UTVD3+ equivalent, this page delivers verified electrical parameters, SOT23-6 package details, watchdog timing behavior, reset threshold hysteresis, supply current at temperature, and real-world interface guidance for μP reset pins and WDI software integration.

Technical Context

The MAX6730UTVD3+ implements a dual-mode watchdog timer: 54s minimum startup delay after reset enables full system initialization, followed by 1.68s minimum normal-mode timeout for rapid fault detection. Its reset logic asserts RST low when VCC1 falls below +4.625V (±125mV), with 0.5% hysteresis and 45µs propagation delay.

It features a 50kΩ internal MR pullup, supports TTL/CMOS-level manual reset triggering, and guarantees RST validity down to VCC1 = +0.8V. The open-drain RST output requires an external pullup and sinks ≤1.2mA at +2.7V while maintaining VOL ≤ 0.3V.

Key Specifications

Pinout & Package

SOT23-6 package (6-pin, 1.6mm × 2.9mm footprint), surface-mount, RoHS-compliant lead(Pb)-free (+T suffix). Thermal resistance θJA = 230°C/W on 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6730UTVD3+, MAX6326UR29D3+ omits critical runtime supervision features, while TPS3808G33DBVR trades watchdog capability and manual reset for lower quiescent current and push-pull output - making MAX6730UTVD3+ uniquely suited for systems requiring both robust boot-time and runtime fault coverage in compact SOT23-6 form.

Availability

MAX6730UTVD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical diagnostics requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6730UTVD3+ 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 high-performance analog and mixed-signal ICs for demanding industrial, communications, and computing applications.

The MAX6730–MAX6735 family was engineered specifically for microprocessor-based systems needing simultaneous voltage monitoring, deterministic reset timing, and independent watchdog supervision in space-constrained SOT23 packages.

FAQ

What is the exact VCC1 reset threshold voltage for MAX6730UTVD3+?

The MAX6730UTVD3+ has a factory-set VCC1 reset threshold of +4.625V (TV suffix), with a guaranteed range of +4.500V to +4.750V at -40°C to +85°C. This value is fixed and does not require external resistor configuration. The threshold exhibits 20ppm/°C tempco and 0.5% hysteresis relative to typical value, ensuring stable operation across temperature. MAX6730UTVD3+ datasheet Table 1 confirms TV corresponds to +4.625V nominal.

Does MAX6730UTVD3+ include a watchdog timer, and what are its timing modes?

Yes, MAX6730UTVD3+ includes a dual-mode watchdog timer: a 54s minimum startup delay after reset (tWD-L) allows full system initialization, followed by a 1.68s minimum normal-mode timeout (tWD-S) for rapid lockup detection. The timer clears on any WDI edge and asserts WDO low if no transition occurs within timeout. MAX6730UTVD3+ uses open-drain WDO output requiring external pullup.

What is the reset timeout period for MAX6730UTVD3+, and how is it selected?

MAX6730UTVD3+ provides a 140–280ms reset timeout period (D3 suffix), guaranteed over -40°C to +85°C. This value is factory-programmed and non-adjustable. The timeout begins when VCC1 rises above threshold and ends with RST deassertion; it restarts if VCC1 drops below threshold before completion. Electrical Characteristics table lists D3 as 140ms (min) / 280ms (max).

How does the manual reset (MR) input function on MAX6730UTVD3+?

MAX6730UTVD3+ features an active-low MR input with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. RST remains low for the full D3 timeout period after MR returns high. MR accepts TTL/CMOS logic levels, requires ≥1µs pulse width, and rejects <100ns glitches. Leaving MR open defaults to high via internal pullup.

What package type and footprint does MAX6730UTVD3+ use?

MAX6730UTVD3+ is housed in a RoHS-compliant, lead(Pb)-free SOT23-6 package (U6+1 outline), measuring 1.6mm × 2.9mm with 0.95mm pitch. It uses JEDEC-standard land pattern 90-0175 and has θJA = 230°C/W on a 4-layer board. The +T suffix explicitly denotes lead-free compliance, and the device is rated for reflow at +260°C.