Analog Devices Inc./Maxim Integrated MAX6756UKWD3+

Overview

MAX6756UKWD3+ from Maxim Integrated is a single-supply, low-power window voltage detector that monitors system VCC for undervoltage (UV) and overvoltage (OV) conditions using factory-trimmed thresholds. It features a ±10% window (W suffix), 100ms minimum reset timeout (D3), active-low open-drain RESET output, manual reset input (MR), and operates from -40°C to +125°C in a 5-pin SOT23-5 package. It is used in microprocessor power supervision where reliable brownout and overvoltage detection is required.

For engineers reviewing the MAX6756UKWD3+ datasheet, MAX6756UKWD3+ pinout, MAX6756UKWD3+ application, or MAX6756UKWD3+ equivalent, key selection criteria include its fixed 1.8V nominal monitoring range, ±10% window tolerance, 10µA supply current, open-drain RESET output with 0.3V VOL at 100µA, and compatibility with systems requiring robust transient immunity and extended temperature operation.

Technical Context

The MAX6756UKWD3+ implements a dual-threshold comparator architecture with internal precision reference and hysteresis (0.7%). Its SET pin configures the window width (±5%/±10%/±15%), and MR provides asynchronous reset assertion independent of supply voltage transitions. The device asserts RESET when VCC falls below UVTH (1.62V–1.98V) or rises above OVTH (1.89V–2.16V) across -40°C to +125°C.

It uses a single internal reference to derive both UV and OV thresholds relative to VCC, enabling accurate window detection without external components. The 100ms timeout period (D3) ensures stable reset hold-off after UV recovery, while the open-drain RESET output supports wired-OR configurations and level-shifting in mixed-voltage systems.

Key Specifications

Pinout & Package

MAX6756UKWD3+ is housed in a 5-pin SOT23-5 package with exposed pad (lead-free +T variant). Pin 1 is VCC, Pin 2 is GND, Pin 3 is MR, Pin 4 is RESET, and Pin 5 is SET. All pins are surface-mount compatible and support reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar window voltage detection applications.

Compared with TLV809E18DBZR and ADM6315-18ARTZ-RL, MAX6756UKWD3+ uniquely delivers combined UV/OV window detection with ±10% adjustability, 10µA ICC, and open-drain flexibility-making it the only option among the three that fully replaces discrete dual-comparator solutions in compact, thermally demanding designs.

Availability

MAX6756UKWD3+ is available at Aetrix Electronics and suitable for microprocessor supervision, industrial PLC power monitoring, automotive body control modules, and medical sensor node power integrity applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6756UKWD3+ 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 high-reliability industrial, automotive, and computing applications.

The MAX6754–MAX6764 family was developed to provide integrated, low-power window voltage supervision with factory-trimmed thresholds and configurable timing-targeting space-constrained systems needing guaranteed power-rail integrity without external passive components.

FAQ

What is the exact undervoltage and overvoltage threshold range for MAX6756UKWD3+ at +25°C?

The MAX6756UKWD3+ has a nominal 1.8V VCC threshold with ±10% window (SET = VCC). At +25°C, its undervoltage threshold (UVTH) is 1.62V to 1.98V (falling VCC), and overvoltage threshold (OVTH) is 1.89V to 2.16V (rising VCC). These values are factory-trimmed and specified over -40°C to +125°C with 0.7% hysteresis. MAX6756UKWD3+ meets these limits across its full operating temperature range.

Does MAX6756UKWD3+ support operation below 1.8V supply voltage?

Yes, MAX6756UKWD3+ maintains correct output logic states (RESET asserted) for VCC down to 1.0V, though voltage monitoring functionality requires VCC ≥ 1.4V. Below 1.4V, the internal reference remains active and outputs stay asserted, ensuring fail-safe behavior during deep brownout. This guarantees MAX6756UKWD3+ holds microprocessors in reset even during severe undervoltage events.

Can the RESET output of MAX6756UKWD3+ drive a 5V logic input directly?

No-MAX6756UKWD3+ features an open-drain RESET output that requires an external pull-up resistor. To interface with a 5V logic input, connect a pull-up resistor from RESET (Pin 4) to a 5V rail. The output sinks up to 100µA with VOL ≤ 0.3V, making it compatible with 5V CMOS inputs when properly pulled up. MAX6756UKWD3+ does not provide level translation internally.

How does the SET pin affect the window width of MAX6756UKWD3+?

The SET pin on MAX6756UKWD3+ selects the window tolerance: tie to GND for ±5%, to VCC for ±10% (as configured in this part), or bias to VCC/2 for ±15%. This adjusts both UVTH and OVTH symmetrically around the 1.8V nominal. The internal divider network ensures consistent tracking across temperature, and MAX6756UKWD3+'s electrical characteristics validate this behavior across -40°C to +125°C.

Is MAX6756UKWD3+ qualified for automotive applications?

MAX6756UKWD3+ is specified for -40°C to +125°C operation and built in Maxim's automotive-capable process, but it is not AEC-Q100 qualified. For automotive applications requiring formal qualification, consider the /V automotive-grade variants (e.g., MAX6756UKWD3+/V), which undergo additional stress testing. MAX6756UKWD3+ remains suitable for non-safety-critical automotive subsystems where extended temperature performance is required but formal AEC-Q100 is not mandated.