Analog Devices Inc./Maxim Integrated MAX6468XS16D3

Overview

MAX6468XS16D3 from Maxim Integrated is a push-pull, active-low microprocessor supervisory reset circuit monitoring +1.8V supplies with a factory-trimmed 1.575V reset threshold (±2.5% over -40°C to +85°C), 150ms minimum reset timeout, and operation down to VCC = +1V. It provides edge-triggered manual reset with one-shot pulsed output and is used in automotive engine control units to ensure deterministic µP reset during cold-crank voltage sag.

For engineers reviewing the MAX6468XS16D3 datasheet, MAX6468XS16D3 pinout, MAX6468XS16D3 application, or MAX6468XS16D3 equivalent, key selection criteria include its SC70-4 package, push-pull RESET output drive capability (VOH ≥ 0.8×VCC at 500µA), immunity to <100ns MR glitches, and guaranteed operation across -40°C to +125°C.

Technical Context

The MAX6468XS16D3 implements a precision bandgap-based voltage monitor with hysteresis and a digital one-shot timer for both VCC dropout and MR edge events. Its internal 1.5kΩ MR pullup eliminates external components, and the push-pull output drives loads directly without external pullup resistors.

Reset assertion is triggered by either VCC falling below 1.575V (with 35µs propagation delay) or a falling edge on MR, after which RESET remains low for exactly 150ms (min) regardless of MR signal duration. The device maintains valid RESET output as long as VCC ≥ +1V, enabling reliable reset hold during deep brownout conditions.

Key Specifications

Pinout & Package

MAX6468XS16D3 is housed in a 4-pin SC70-4 package (1.25mm × 1.25mm × 0.9mm, 0.65mm pitch), optimized for space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6468XS16D3, MAX6315US29D3 offers open-drain compatibility at the cost of added BOM and reduced drive strength, while TLV803EB29DBZR trades MR robustness and automotive qualification for lower unit price and smaller size in non-safety-critical applications.

Availability

MAX6468XS16D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6468XS16D3 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 automotive, industrial, and communications markets, with expertise in power management and reliability-critical functions.

The MAX6468XS16D3 belongs to Maxim's microprocessor supervisory reset product line, engineered specifically for deterministic reset generation in harsh automotive and industrial environments where voltage sags, EMI, and extreme temperatures demand guaranteed timing and precision.

FAQ

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

The MAX6468XS16D3 has a factory-trimmed nominal reset threshold of 1.575V, with a minimum of 1.536V and maximum of 1.614V over -40°C to +85°C (±2.5%). At +85°C to +125°C, tolerance widens to ±3%, ensuring reliable detection of +1.8V supply brownout across full automotive operating range. This threshold is laser-trimmed during wafer test and does not require external calibration.

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

No, the MAX6468XS16D3 features a push-pull RESET output and does not require an external pullup resistor. It can source up to 500µA and sink up to 3.2mA, enabling direct connection to µP reset inputs. In contrast, the open-drain MAX6467 variant requires an external pullup. This simplifies layout and reduces BOM count in space-constrained designs using the MAX6468XS16D3.

How does the manual reset (MR) function work on the MAX6468XS16D3?

The MR input of the MAX6468XS16D3 is edge-triggered: a falling edge initiates a fixed 150ms (min) one-shot RESET pulse, independent of MR signal duration. An internal 1.5kΩ pullup to VCC allows MR to float if unused. The device also incorporates 150ms rising-edge debounce and 100ns glitch rejection to prevent false triggers from switch bounce or EMI-key reliability features confirmed in the MAX6468XS16D3 datasheet timing diagrams.

What is the minimum supply voltage at which the MAX6468XS16D3 guarantees valid RESET output?

The MAX6468XS16D3 guarantees valid RESET output down to VCC = +1V, meaning RESET remains logically correct (low when asserted, high when deasserted) even as the supply decays. This is critical for automotive cold-crank scenarios where battery voltage may sag to 6V on a 12V system, causing downstream LDOs to drop below 2V. Below +1V, the MAX6468XS16D3 behavior is undefined per absolute maximum ratings.

Is the MAX6468XS16D3 pin-compatible with other Maxim reset supervisors?

Yes, the MAX6468XS16D3 is pin-compatible with MAX811, MAX6315, MAX6384, and MAX6386 in the same SC70-4 package. All share identical 4-pin SC70 pinout (VCC, GND, RESET, MR), enabling drop-in replacement where push-pull output and 1.575V threshold meet system requirements. This compatibility is explicitly documented in the MAX6468XS16D3 datasheet Features section.