Analog Devices Inc./Maxim Integrated MAX6468XS22D3

Overview

MAX6468XS22D3 from Maxim Integrated is a push-pull, active-low microprocessor supervisory reset circuit monitoring +2.188V supply voltage with ±2.5% threshold accuracy over -40°C to +85°C, 150ms minimum VCC and MR reset timeout, and valid RESET output down to VCC = +1V - used in automotive engine control units to ensure deterministic µP reset during cold-crank brownout events.

For engineers reviewing the MAX6468XS22D3 datasheet, MAX6468XS22D3 pinout, MAX6468XS22D3 application, or MAX6468XS22D3 equivalent, key selection criteria include factory-trimmed 2.188V threshold tolerance, edge-triggered manual reset immunity to switch bounce, SC70-4 package footprint compatibility, and push-pull output eliminating external pull-up requirements.

Technical Context

The MAX6468XS22D3 implements a precision bandgap-based voltage reference with internal hysteresis to detect VCC drops below 2.188V (typ), asserting RESET within 35µs. Its edge-triggered MR input uses an internal 1.5kΩ pull-up and debounces falling edges with a fixed 150ms rising debounce period (tDEB) to reject switch bounce.

RESET remains asserted for 150ms (min) after VCC recovers above threshold or after MR falling edge, with push-pull output sourcing up to 800µA at VCC ≥ +4.5V and sinking 3.2mA while maintaining VOL ≤ 0.3V - enabling direct interface to µP reset inputs without external components.

Key Specifications

Pinout & Package

MAX6468XS22D3 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained automotive and portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6468XS22D3, MAX6315US23D3 offers identical timing and threshold but demands external pull-up and lacks noise-immune push-pull drive, while TLV803EB22DBZR omits MR entirely and cannot support field-service reset workflows.

Availability

MAX6468XS22D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and DSL modem power management requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6468XS22D3 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 MAX6467/MAX6468 family delivers highly accurate, low-power supervisory circuits with factory-trimmed thresholds and robust manual reset handling - engineered specifically for automotive-grade reliability in harsh voltage environments.

FAQ

What is the exact reset threshold voltage of MAX6468XS22D3 and its tolerance range?

The MAX6468XS22D3 has a nominal reset threshold of 2.188V, with ±2.5% tolerance over the -40°C to +85°C temperature range and ±3% over -40°C to +125°C. This value is factory-trimmed and specified in the Reset Threshold table of the datasheet; it ensures reliable detection of brownout on 2.5V rails with adequate margin. The MAX6468XS22D3 does not require external calibration or adjustment.

Does MAX6468XS22D3 support manual reset functionality, and how is it implemented?

Yes, MAX6468XS22D3 features an edge-triggered manual reset (MR) input that responds to falling edges only. It includes internal 1.5kΩ pull-up, 150ms rising debounce (tDEB), and generates a fixed 150ms (min) one-shot RESET pulse. This implementation rejects switch bounce and eliminates need for external debounce circuitry - a key differentiator from basic reset monitors. The MAX6468XS22D3 MR pin is TTL/CMOS-compatible and accepts open-drain inputs.

What is the output configuration of MAX6468XS22D3, and why does it matter for system design?

MAX6468XS22D3 uses an active-low push-pull RESET output, unlike the open-drain version in MAX6467 variants. This means it actively drives both high and low states without requiring an external pull-up resistor. As a result, the MAX6468XS22D3 reduces BOM count, improves noise immunity on the reset line, and ensures faster rise times - critical in high-speed µP interfaces where weak pull-ups cause timing violations.

Can MAX6468XS22D3 operate reliably during severe undervoltage conditions, and down to what VCC level?

Yes, MAX6468XS22D3 guarantees valid RESET assertion down to VCC = +1V, maintaining VOL ≤ 0.3V while sinking up to 3.2mA. This capability ensures deterministic reset behavior during automotive cold-crank events where battery voltage collapses to ~6V and downstream regulators dip near 1V. Below +1V, RESET becomes undefined - so the MAX6468XS22D3 is not rated for operation at 0V, unlike some competing devices with special charge-pump schemes.

Which package type and footprint does MAX6468XS22D3 use, and is it compatible with automated assembly?

MAX6468XS22D3 is packaged in a 4-pin SC70-4 (2.0mm × 2.1mm, 0.65mm pitch) with gull-wing leads, fully compatible with standard SMT reflow processes including lead-free soldering. Its small size and defined thermal profile support high-density automotive PCB layouts. The MAX6468XS22D3 shares footprint compatibility with other SC70-4 supervisory ICs like MAX6315, enabling design reuse - but pinout differs from SOT-143 variants (e.g., MAX6468US22D3).