Analog Devices Inc./Maxim Integrated MAX6319LHUK26C

Overview

MAX6319LHUK26C from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.6V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and no watchdog timer. It monitors VCC supply integrity and asserts reset during power-up, brownout, or manual reset events in embedded control systems.

For engineers reviewing the MAX6319LHUK26C datasheet, MAX6319LHUK26C pinout, MAX6319LHUK26C application, or MAX6319LHUK26C equivalent, this page delivers verified functional identity, exact reset timing behavior, validated bidirectional reset compatibility context, and confirmed alternative selection guidance for industrial and portable equipment designs.

Technical Context

The MAX6319LHUK26C implements a precision voltage-monitoring comparator with factory-laser-trimmed resistive divider setting VRST = 2.6V, guaranteed valid down to VCC = 1V. Its reset generator guarantees monotonic assertion/deassertion with 140ms minimum active duration after VCC rise above threshold.

This variant lacks watchdog functionality (no WDI input servicing) and features manual reset input (MR) with internal 52kΩ pullup, 100ns glitch rejection, and TTL/CMOS-compatible logic thresholds. The active-low push/pull RESET output sources/sinks current without external components.

Key Specifications

Pinout & Package

MAX6319LHUK26C is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free compatible, with thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6319LHUK26C, MAX6319MHUK26C adds bidirectional reset support for legacy microcontrollers but requires identical board footprint, while TPS3808G12DBVR trades manual reset and higher threshold tolerance for sub-µA quiescent current in energy-constrained systems.

Availability

MAX6319LHUK26C is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pump controllers, automotive body control modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6319LHUK26C 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 power, sensing, interface, and reliability-critical applications.

The MAX6316–MAX6322 family was engineered specifically for robust microprocessor supervision in harsh environments-delivering guaranteed reset validity down to 1V, immunity to fast supply transients, and factory-trimmed precision across automotive and industrial temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6319LHUK26C and how tightly is it specified?

The MAX6319LHUK26C has a factory-trimmed nominal reset threshold of 2.6V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table under "Reset Threshold (VRST)" and aligns with Table 1's "MAX63___26_ _-T" designation. The device uses laser-trimmed internal resistors to achieve this precision without external components.

Does MAX6319LHUK26C include a watchdog timer function?

No, MAX6319LHUK26C does not include a watchdog timer. The "LH" suffix in the part number indicates active-low push/pull reset output and absence of watchdog functionality. Pin 4 (WDI) is a no-connect (NC) and must be left floating. This is confirmed by the Selector Guide showing MAX6319LH with blank entries under "WATCHDOG INPUT" and by the Ordering Information noting that watchdog-capable variants use suffixes like "W", "X", "Y", or "Z".

What is the reset timeout period of MAX6319LHUK26C and how is it implemented?

MAX6319LHUK26C provides a minimum reset active timeout period of 140ms after VCC rises above the 2.6V threshold. This is a factory-programmed, capacitor-free timing function generated by an internal oscillator and counter. The value corresponds to the "C" suffix in the ordering code (per Table 3), and is guaranteed over temperature without external components-enabling reliable release timing for microcontroller clock stabilization and memory initialization.

Can MAX6319LHUK26C operate reliably during severe supply brownout conditions?

Yes, MAX6319LHUK26C guarantees valid reset assertion down to VCC = 1.0V, as explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its push/pull RESET output remains functional-sinking 50µA at 1.0V-ensuring deterministic reset behavior even as the supply collapses, preventing undefined MCU states during critical power-down sequences.

How is the manual reset (MR) input configured and what are its electrical requirements?

The MR input of MAX6319LHUK26C features an internal 52kΩ pullup to VCC and accepts logic-low pulses ≥1.5µs to trigger reset. Its thresholds are VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC, supporting direct connection to 3V or 5V logic outputs or a momentary switch to ground. It rejects transients ≤100ns, eliminating need for external debounce-verified in the Electrical Characteristics table under "MR Input Pulse Width" and "MR Glitch Rejection".