Analog Devices Inc./Maxim Integrated MAX6323CUT29+T

Overview

MAX6323CUT29+T from Maxim Integrated is a push-pull-output microprocessor supervisory circuit with windowed (min/max) watchdog, 2.93V ±2.5% reset threshold, 300ms slow timeout and 15ms fast timeout, operating from 1.2V to 5.5V supply over –40°C to +125°C - used in automotive engine control units to detect firmware lockup during cold-cranking conditions.

For engineers reviewing the MAX6323CUT29+T datasheet, MAX6323CUT29+T pinout, MAX6323CUT29+T application, or MAX6323CUT29+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.2V, debounced manual reset input, 23µA typical supply current, and factory-laser-trimmed timing accuracy without external components.

Technical Context

The MAX6323CUT29+T implements a dual-window watchdog using two independent timeout comparators: one detecting WDI falling edges too close (fast fault, tWD1 = 15ms min), the other detecting intervals too wide (slow fault, tWD2 = 300ms min). Both timeouts are laser-trimmed at wafer level and temperature-compensated across –40°C to +125°C.

Its VCC monitor uses a precision bandgap reference and comparator with ±2.5% threshold accuracy over temperature; RESET remains asserted for ≥100ms after VCC rises above 2.93V and MR deasserts. The push-pull RESET output drives CMOS loads directly without external pullup.

Key Specifications

Pinout & Package

MAX6323CUT29+T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and JEDEC-standard thermal pad layout (land pattern 90-0175).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324CUT29+T, the MAX6323CUT29+T provides direct-drive RESET capability eliminating pullup resistors, while TPS3808G33DBVR trades watchdog intelligence for higher reset accuracy and lower cost in simpler systems.

Availability

MAX6323CUT29+T is available at Aetrix Electronics and suitable for automotive engine control, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6323CUT29+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, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX6323/MAX6324 family delivers AEC-Q100-qualified supervisory functions with windowed watchdogs specifically for automotive ECUs and safety-critical embedded systems requiring deterministic fault detection.

FAQ

What is the exact reset threshold voltage of MAX6323CUT29+T and how is it trimmed?

The MAX6323CUT29+T has a nominal reset threshold of 2.93V with ±2.5% accuracy over –40°C to +125°C. This value is achieved via factory laser trimming of on-chip resistors during wafer test, ensuring no external calibration is needed. The '29' suffix in MAX6323CUT29+T explicitly denotes the 2.85V–3.00V threshold range per the Reset Threshold Range table in the datasheet.

Does MAX6323CUT29+T support windowed watchdog functionality, and what are its timeout values?

Yes, MAX6323CUT29+T implements true min/max (windowed) watchdog behavior. For the 'C' suffix, the fast timeout is 15ms minimum and the slow timeout is 300ms minimum - both factory-laser-trimmed and temperature-compensated. These values are fixed for MAX6323CUT29+T and cannot be adjusted externally.

What is the RESET output configuration of MAX6323CUT29+T, and why does it matter?

MAX6323CUT29+T features a push-pull RESET output, meaning it actively drives both high and low states without requiring an external pullup resistor. This simplifies PCB layout, reduces component count, and ensures robust drive into capacitive or CMOS loads - unlike the open-drain MAX6324 variant which mandates a pullup.

Can MAX6323CUT29+T operate reliably during automotive cold-cranking when battery voltage drops below 2.0V?

Yes. MAX6323CUT29+T guarantees valid RESET assertion down to VCC = +1.2V, and its internal circuitry remains functional even as supply decays. This allows it to hold the microcontroller in reset throughout severe cold-cranking events (e.g., 6V–8V battery sags), preventing erratic operation until stable voltage is restored.

How is the manual reset input (MR) debounced in MAX6323CUT29+T, and what is its minimum pulse width?

MAX6323CUT29+T integrates internal RC filtering and digital synchronization on the MR pin, providing hardware debouncing that rejects transients as short as 100ns. The minimum valid MR pulse width is 1µs - enabling direct connection to mechanical switches or logic signals without external RC networks or Schmitt triggers.