Analog Devices Inc./Maxim Integrated MAX6730AUTTD3+T

Overview

MAX6730AUTTD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, factory-set 3.075V VCC1 reset threshold, 210ms reset timeout period, and independent watchdog timer featuring 35s startup delay and 1.68s normal timeout. It monitors +3.3V or +2.5V primary supply rails in embedded systems requiring reliable power-on reset and lockup protection.

For engineers reviewing the MAX6730AUTTD3+T datasheet, MAX6730AUTTD3+T pinout, MAX6730AUTTD3+T application, or MAX6730AUTTD3+T equivalent, this device delivers deterministic reset assertion down to VCC1 = +0.8V, immunity to sub-100ns VCC transients, low 14µA typical supply current, and SOT23-6 packaging for space-constrained industrial and telecom designs.

Technical Context

The MAX6730AUTTD3+T implements a dual-mode watchdog architecture: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.68s minimum normal timeout for rapid fault detection. Its reset logic asserts RST low when VCC1 falls below 3.075V (±1.5% over temperature), with 45µs propagation delay and 0.5% hysteresis.

Powered from VCC1 only, it features a 50kΩ internal MR pullup, 100ns MR glitch rejection, and guaranteed operation across -40°C to +125°C. The open-drain RST output sinks 3.2mA at VCC1 ≥ +4.5V with VOL ≤ 0.4V, requiring an external pullup resistor for logic-level compatibility.

Key Specifications

Pinout & Package

MAX6730AUTTD3+T is housed in a 6-pin SOT23-6 package (U6-1) with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height - optimized for high-density PCB layouts in compact modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6730AUTTD3+T, MAX6326UT30D3+T omits critical watchdog and manual reset functions, while TPS3808G30DBVR trades extended temperature rating and open-drain flexibility for lower component count - making MAX6730AUTTD3+T optimal for ruggedized, feature-complete supervision.

Availability

MAX6730AUTTD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical handheld diagnostics, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6730AUTTD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6730A–MAX6735A family was designed specifically for multivoltage µP-based systems needing simultaneous supply monitoring, deterministic reset timing, and robust watchdog protection in harsh thermal environments.

FAQ

What is the exact reset threshold voltage for MAX6730AUTTD3+T?

The MAX6730AUTTD3+T has a factory-set VCC1 reset threshold of 3.075V (T-suffix), with ±1.5% tolerance over the full -40°C to +125°C operating range. This value is trimmed during production and specified in the Electrical Characteristics table of the MAX6730A–MAX6735A datasheet. The threshold remains stable with 20ppm/°C tempco and 0.5% hysteresis to prevent chatter near trip point.

Does MAX6730AUTTD3+T support manual reset functionality?

Yes, MAX6730AUTTD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion for the full 210ms timeout period, regardless of VCC1 status. The input rejects glitches <100ns and requires only a 1µs minimum pulse width, enabling reliable pushbutton or logic-controlled reset initiation.

What watchdog timeout periods does MAX6730AUTTD3+T provide?

MAX6730AUTTD3+T features a dual-mode watchdog: a 35s minimum startup delay after any reset event (power-up, brownout, or MR assertion), followed by a 1.68s minimum normal timeout period. The timer clears on any WDI edge transition and asserts WDO low if no transition occurs within the active timeout window - ensuring both safe boot sequencing and rapid hang detection.

Is MAX6730AUTTD3+T compatible with 1.8V supply rails?

No, MAX6730AUTTD3+T is not rated for direct 1.8V operation as VCC1. Its absolute minimum VCC1 is +0.8V, but the 3.075V reset threshold requires VCC1 ≥ ~3.1V to avoid permanent reset assertion. For 1.8V systems, use variants like MAX6730AUTVD3+T (1.575V threshold) or MAX6730AUTDD3+T (0.788V threshold), which are explicitly characterized for lower-voltage rails.

What package type and dimensions does MAX6730AUTTD3+T use?

MAX6730AUTTD3+T uses a 6-pin SOT23-6 package (U6-1 code) measuring 2.9mm × 1.6mm × 1.1mm with 0.95mm lead pitch. It complies with JEDEC MO-178 and is available in lead-free (RoHS-compliant) form, indicated by the "+T" suffix. The small footprint supports high-density layouts in space-constrained applications like portable medical devices and telecom modules.