Analog Devices Inc./Maxim Integrated MAX6319LHUK29C

Overview

MAX6319LHUK29C from Maxim Integrated is a 5-pin µP supervisory circuit with active-low push/pull reset output, manual reset input, and watchdog timer. It monitors VCC supply voltage (2.5V–5.5V), asserts reset below 2.93V threshold, provides 140ms minimum reset timeout, and features 6.3ms typical watchdog timeout. Used in embedded control systems to prevent code-execution errors during power-up, brownout, or software lockup.

For engineers reviewing the MAX6319LHUK29C datasheet, MAX6319LHUK29C pinout, MAX6319LHUK29C application, or MAX6319LHUK29C equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, bidirectional reset compatibility support (via MR/WDI logic), and factory-trimmed 2.93V threshold with ±2.5% tolerance over -40°C to +125°C.

Technical Context

The MAX6319LHUK29C implements a precision voltage monitor with laser-trimmed resistor divider setting nominal VRST = 2.93V, combined with a digital reset generator and watchdog timer cleared by WDI edge transitions. Its active-low push/pull RESET output sources/sinks current and remains valid down to VCC = 1V.

It integrates manual reset detection with internal 52kΩ pullup on MR, supports glitch rejection (100ns), and uses internal timing circuits for tRP = 140ms (min) and tWD = 6.3ms (typ). The device operates across -40°C to +125°C and draws only 3–8µA supply current at 3.6V.

Key Specifications

Pinout & Package

MAX6319LHUK29C is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, with lead-free finish (indicated by "+T" suffix variant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6319MHUK29C and TPS3808G33DBVR, MAX6319LHUK29C uniquely delivers factory-trimmed 2.93V detection, integrated manual reset and watchdog, and push/pull drive-making it the only option supporting full-feature µP supervision in space-constrained SOT23-5 industrial designs requiring precise undervoltage thresholds.

Availability

MAX6319LHUK29C is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6319LHUK29C 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6316–MAX6322 family was engineered specifically for robust microprocessor supervision in harsh environments-delivering guaranteed reset validity down to 1V, high noise immunity, and integrated watchdog/manual reset in miniature SOT23 packages.

FAQ

What is the exact reset threshold voltage of MAX6319LHUK29C and how tightly is it specified?

The MAX6319LHUK29C has a factory-trimmed nominal reset threshold of 2.93V, with a guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This specification is confirmed in Table 1 and Electrical Characteristics section of the MAX6316–MAX6322 datasheet, and applies directly to the MAX6319LHUK29C variant.

Does MAX6319LHUK29C support manual reset functionality, and how is the MR pin configured?

Yes, MAX6319LHUK29C includes a manual reset (MR) input on Pin 3. It features an internal 52kΩ pullup resistor, so MR can be left unconnected when unused. Driving MR low forces a reset that remains asserted for the full 140ms timeout period after MR returns high. The MR pin rejects transients as short as 100ns, and MAX6319LHUK29C is explicitly listed in the Selector Guide as supporting MR.

What watchdog timeout period is implemented in MAX6319LHUK29C, and is it enabled by default?

MAX6319LHUK29C implements a typical watchdog timeout of 6.3ms (suffix "W"), as indicated by the "W" in its ordering code structure per Table 3. The watchdog is enabled by default and monitored via the WDI pin (Pin 4); it triggers reset if no rising or falling edge occurs within 6.3ms. To disable it, leave WDI unconnected-the internal timer is then serviced automatically.

Can MAX6319LHUK29C operate reliably during severe supply voltage droops, and down to what VCC level does reset remain valid?

Yes, MAX6319LHUK29C guarantees valid reset output behavior down to VCC = 1.0V, as explicitly stated in the General Description and Electrical Characteristics tables. Its push/pull RESET output maintains logic-low and logic-high states even at 1V supply, ensuring deterministic µP reset assertion during deep brownout conditions where many supervisors fail.

What package type and footprint does MAX6319LHUK29C use, and are there RoHS-compliant variants available?

MAX6319LHUK29C uses a standard 5-pin SOT23 package (2.9mm × 1.6mm), with land pattern compatible with JEDEC MO-178AA. RoHS-compliant versions are available: replace "-T" with "+T" in the order code (e.g., MAX6319LHUK29C+T) to specify lead-free packaging, as documented in the Package Information section.