Analog Devices Inc./Maxim Integrated MAX6468US30D3

Overview

MAX6468US30D3 from Maxim Integrated is a microprocessor supervisory reset circuit in SOT143-4 package, featuring a factory-trimmed 3.000V reset threshold (±3% over -40°C to +125°C), 150ms minimum VCC and MR reset timeout, active-low push-pull RESET output, and operation down to VCC = +1V. It monitors single +3.0V supplies in automotive engine control units and industrial PLCs.

For engineers reviewing the MAX6468US30D3 datasheet, MAX6468US30D3 pinout, MAX6468US30D3 application, or MAX6468US30D3 equivalent, key selection criteria include its edge-triggered manual reset with 150ms one-shot timing, push-pull output eliminating external pull-up, immunity to <100ns MR glitches, 3µA supply current at 1.8V, and guaranteed operation across -40°C to +125°C.

Technical Context

The MAX6468US30D3 implements a precision bandgap-based voltage monitor with hysteresis-free threshold detection and internal timing logic for independent VCC and MR reset assertion. Its push-pull RESET driver delivers VOH ≥ 0.8×VCC at 800µA and VOL ≤ 0.3V at 3.2mA, enabling direct interface with 3.0V µP reset inputs without external components.

Edge-triggered MR input includes 150ms rising-edge debounce and ignores subsequent falling edges within tDEB, ensuring reliable manual reset initiation even with mechanical switch bounce. The device asserts RESET low on VCC drop below 3.000V or MR falling edge, holding low for 150–300ms (min–max) after recovery or trigger.

Key Specifications

Pinout & Package

MAX6468US30D3 is housed in a 4-pin SOT143-4 package (3.0mm × 1.6mm × 1.1mm), optimized for high-density automotive PCB layouts and thermally demanding under-hood environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6468US30D3, MAX6386US30D3 adds board-level design complexity due to mandatory pull-up, while TLV809E30DBZR sacrifices automotive qualification and doubles supply current-making MAX6468US30D3 optimal for AEC-Q100-compliant, ultra-low-power, high-reliability applications.

Availability

MAX6468US30D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, medical infusion pump controllers, and telecom DSL modem power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6468US30D3 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6467/MAX6468 product line was designed specifically for automotive and industrial microprocessor supervision-delivering precision reset thresholds, edge-triggered manual reset, and extended temperature operation without external components.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6468US30D3?

The MAX6468US30D3 has a factory-trimmed nominal reset threshold of 3.000V, with a tolerance of ±3% over the full –40°C to +125°C operating temperature range. This value is confirmed in the Reset Threshold table of the official datasheet and applies specifically to the "30" suffix variant. The MAX6468US30D3 is therefore optimized for reliable supervision of +3.0V power rails in automotive and industrial environments where tight voltage margining is required.

Does MAX6468US30D3 require an external pull-up resistor on the RESET pin?

No, the MAX6468US30D3 features an active-low push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants (e.g., MAX6467), it does not require an external pull-up resistor-reducing component count, PCB area, and potential noise coupling. This design allows direct connection to the reset input of most 3.0V microcontrollers without additional passive components, simplifying layout and improving reliability in high-vibration applications.

What is the MR input behavior and debounce timing for MAX6468US30D3?

The MR input of MAX6468US30D3 is edge-triggered: a falling edge initiates a fixed 150ms (min) one-shot reset pulse on RESET. It includes a 150ms rising-edge debounce period (tDEB), during which subsequent MR falling edges are ignored-ensuring robust operation with mechanical pushbuttons. An internal 1.5kΩ pull-up resistor to VCC allows MR to remain unconnected if unused. This behavior is identical across all D3-suffix devices, including MAX6468US30D3.

Can MAX6468US30D3 operate reliably during severe supply brownout conditions?

Yes, the MAX6468US30D3 guarantees functional operation down to VCC = +1.2V and maintains valid RESET assertion down to VCC = +1.0V. Its internal circuitry remains active and correctly timed even as the supply collapses, ensuring the microcontroller receives a clean, well-timed reset signal throughout the entire brownout event. This capability is explicitly verified across –40°C to +125°C and is a key differentiator for MAX6468US30D3 in automotive and industrial power-loss scenarios.

Is MAX6468US30D3 pin-compatible with other supervisory ICs in the same family?

Yes, MAX6468US30D3 is pin-compatible with other MAX6468 variants in the SOT143-4 package (e.g., MAX6468US29D3, MAX6468US46D3) and shares the same 4-pin footprint and pinout (VCC, GND, RESET, MR) with the MAX6467 series and legacy parts including MAX811, MAX6315, MAX6384, and MAX6386. This allows drop-in replacement within the same package type, provided the reset threshold and output type (push-pull vs. open-drain) meet system requirements.