Analog Devices Inc./Maxim Integrated MAX6468XS22D3+

Overview

The MAX6468XS22D3+ from Maxim Integrated is a push-pull output microprocessor supervisory reset circuit monitoring +2.2V supply voltage with factory-trimmed ±2.5% threshold accuracy over -40°C to +125°C, 150ms minimum reset timeout, and active-low RESET assertion valid down to VCC = +1V. It serves as a system-level power-on/brownout detector in automotive and industrial embedded controllers.

For engineers reviewing the MAX6468XS22D3+ datasheet, MAX6468XS22D3+ pinout, MAX6468XS22D3+ application, or MAX6468XS22D3+ equivalent, key selection criteria include its edge-triggered manual reset with 150ms one-shot timing, push-pull output eliminating external pull-up, low 3µA supply current at 1.8V, and SC70-4 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a precision bandgap-based voltage monitor with internal hysteresis and digital timing logic for deterministic reset assertion. Its edge-triggered MR input uses an internal 1.5kΩ pull-up and debounces switch bounce via a 150ms rising-edge lockout window.

The push-pull RESET output drives low with VOL ≤ 0.3V at 3.2mA sink (VCC ≥ +4.5V) and high with VOH ≥ 0.8×VCC at 800µA source, enabling direct interface with µP reset inputs without external components. Reset timeout is fixed at 150ms (min) and independent of temperature variation across the full automotive range.

Key Specifications

Pinout & Package

MAX6468XS22D3+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm × 0.9mm), optimized for high-density PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6384US22D3+, MAX6468XS22D3+ saves one passive component and simplifies layout; versus TPS3808G125DBVR, it offers smaller footprint and lower quiescent current but trades off threshold precision and timeout flexibility.

Availability

MAX6468XS22D3+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, medical infusion pump controllers, and DSL modem power management requiring stable component supply across extended temperature ranges.

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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6467/MAX6468 family delivers highly accurate, low-power supervisory circuits optimized for automotive-grade reliability and minimal external component count in space-constrained systems.

FAQ

What is the exact reset threshold voltage of the MAX6468XS22D3+?

The MAX6468XS22D3+ has a factory-trimmed nominal reset threshold of +2.2V, with guaranteed tolerance of ±2.5% over the -40°C to +85°C temperature range and ±3% over -40°C to +125°C. This value is laser-trimmed during production and documented in the Reset Threshold table of the MAX6467/MAX6468 datasheet. The MAX6468XS22D3+ is specifically configured for monitoring +2.5V supplies with typical 10% tolerance margins.

Does the MAX6468XS22D3+ require an external pull-up resistor on the RESET pin?

No, the MAX6468XS22D3+ features a push-pull RESET output that actively drives both high and low states, eliminating the need for an external pull-up resistor. This contrasts with the open-drain MAX6467 variant and reduces BOM count and PCB area. The MAX6468XS22D3+ guarantees VOH ≥ 0.8×VCC at 800µA source current and VOL ≤ 0.3V at 3.2mA sink current, enabling direct interface with standard µP reset inputs.

What is the function of the MR pin on the MAX6468XS22D3+?

The MR (Manual Reset) pin on the MAX6468XS22D3+ is an edge-triggered input that initiates a fixed 150ms (min) one-shot RESET pulse on its falling edge. It includes an internal 1.5kΩ pull-up to VCC, allowing direct connection to a normally-open pushbutton switch between MR and GND. The MAX6468XS22D3+ ignores subsequent MR falling edges for 150ms after MR rises, preventing false triggers from switch bounce without external filtering components.

Can the MAX6468XS22D3+ operate reliably during deep brownout conditions?

Yes, the MAX6468XS22D3+ guarantees valid RESET output operation down to VCC = +1V, ensuring deterministic reset behavior even as the supply collapses. Its internal circuitry remains functional and the RESET signal stays asserted until VCC recovers above the +2.2V threshold and holds for the full 150ms timeout period. This capability makes the MAX6468XS22D3+ suitable for automotive stop-start systems and other applications subject to severe undervoltage transients.

What package type and dimensions does the MAX6468XS22D3+ use?

The MAX6468XS22D3+ is packaged in a 4-pin SC70-4 (also referenced as SC-70) outline measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and 0.65mm pitch. This ultra-small package is pin-compatible with the SOT143-4 variant (MAX6468US22D3+) but offers superior board-area efficiency. The SC70-4 footprint is documented in Maxim's package drawing 21-0098 and supported by standard reflow profiles for lead-free assembly.