Analog Devices Inc./Maxim Integrated MAX6468XS16D3+T

Overview

MAX6468XS16D3+T from Analog Devices is a push-pull, active-low microprocessor supervisory reset circuit in SC70-4 package, monitoring +1.8V supplies with factory-trimmed 1.575V threshold (±1.5% at +25°C), 150ms min reset timeout, edge-triggered manual reset, and valid operation down to VCC = +1V. It ensures reliable reset assertion during power-up, brownout, and transient events in automotive and industrial embedded systems.

For engineers reviewing the MAX6468XS16D3+T datasheet, MAX6468XS16D3+T pinout, MAX6468XS16D3+T application, or MAX6468XS16D3+T equivalent, this page delivers verified electrical parameters, thermal specifications across –40°C to +125°C, MR debounce timing, supply current vs. voltage curves, and precise reset threshold tolerance behavior per temperature zone.

Technical Context

The MAX6468XS16D3+T implements a precision bandgap-based voltage reference and comparator architecture to detect VCC drops below its 1.575V threshold, with ±2.5% total tolerance over –40°C to +85°C and ±3% up to +125°C. Its internal one-shot timer generates fixed 150ms (min) reset pulses on both VCC dropout and MR falling edges.

It features an integrated 1.5kΩ MR pullup resistor, supports TTL/CMOS logic inputs, and provides push-pull RESET output capable of sourcing 500µA at VCC ≥ +2.5V while maintaining VOH ≥ 0.8 × VCC - eliminating external pullups and enabling direct µP reset input drive without level-shifting.

Key Specifications

Pinout & Package

The MAX6468XS16D3+T is housed in a 4-pin SC70-4 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and RoHS-compliant matte-tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6468XS16D3+T, MAX6315US29D3+T targets +3.3V rails and lacks push-pull drive, while TPS3808G16DBVR offers superior accuracy and lower ICC but requires PCB redesign due to non-identical pin mapping and footprint.

Availability

MAX6468XS16D3+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6468XS16D3+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX6467/MAX6468 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - emphasizing precision threshold stability, edge-triggered reliability, and AEC-Q100-compliant operation.

FAQ

What is the exact reset threshold voltage of MAX6468XS16D3+T and how does it vary with temperature?

The MAX6468XS16D3+T has a factory-trimmed nominal reset threshold of 1.575V, with ±1.5% tolerance at +25°C. Over –40°C to +85°C, total tolerance expands to ±2.5%; from +85°C to +125°C, it is ±3%. This behavior is documented in the Reset Threshold vs. Temperature plot (Figure toc05), showing normalized threshold deviation within ±0.5% across the full range - ensuring predictable brownout detection in automotive under-hood applications where MAX6468XS16D3+T is deployed.

Does MAX6468XS16D3+T require an external pullup resistor on the RESET pin?

No, MAX6468XS16D3+T does not require an external pullup resistor on the RESET pin because it features a push-pull output stage. Unlike the open-drain MAX6467 variant, the MAX6468XS16D3+T actively drives RESET high when not asserted, sourcing up to 500µA at VCC ≥ +2.5V while maintaining VOH ≥ 0.8 × VCC. This eliminates external components and simplifies interface to µP reset inputs - a key design advantage confirmed in the Electrical Characteristics table and Functional Diagram for MAX6468XS16D3+T.

What is the MR rising debounce period for MAX6468XS16D3+T and why is it important?

The MR rising debounce period for MAX6468XS16D3+T is 150ms (min), 225ms (typ), 300ms (max). This interval begins when MR transitions from low to high and prevents subsequent falling edges from triggering another reset - effectively filtering mechanical switch bounce. As stated in Note 2 of the datasheet, this ensures only one deterministic reset pulse per button press, which is essential for reliable field operation. The MAX6468XS16D3+T implements this entirely internally, removing need for external RC networks or firmware debouncing logic.

Can MAX6468XS16D3+T operate reliably at VCC = +1.1V, and what happens to RESET output below +1.2V?

Yes, MAX6468XS16D3+T guarantees valid RESET output operation down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below +1.2V, RESET remains functional: it asserts low during brownout and holds low for the full 150ms timeout after VCC recovers above threshold. However, VOH degrades below VCC = +2.5V, and sourcing capability diminishes - so for applications requiring strong high-level drive below +2.5V, designers should verify µP input thresholds against actual VOH data in the VOH vs. ISOURCE curve (Figure toc07) for MAX6468XS16D3+T.

Is MAX6468XS16D3+T pin-compatible with MAX811 or other legacy supervisors?

Yes, MAX6468XS16D3+T is explicitly stated as pin-compatible with MAX811, MAX6315, MAX6384, and MAX6386 in the Features section of the datasheet. All share identical 4-pin SC70-4 pinout (VCC, GND, MR, RESET), same footprint (21-0098), and compatible logic levels. However, threshold voltage (1.575V), timeout (150ms), and push-pull output differ from many MAX811 variants (e.g., MAX811L has 4.63V threshold and open-drain output), so electrical substitution requires validation of reset timing and drive strength - but PCB layout reuse is fully supported for MAX6468XS16D3+T.