Analog Devices Inc./Maxim Integrated MAX6450UT46L

Overview

MAX6450UT46L from Maxim Integrated is a dual-supply microprocessor reset supervisor IC with one fixed-threshold (4.625V) and one adjustable-threshold (0.63V reference) voltage monitor, dual extended-setup manual reset inputs (MR1/MR2), active-low open-drain RESET output, and 6.72s minimum manual reset pulse width - designed for reliable system reset in set-top boxes, DVD players, and industrial equipment where nuisance resets must be avoided.

For engineers reviewing the MAX6450UT46L datasheet, MAX6450UT46L pinout, MAX6450UT46L application, or MAX6450UT46L equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (210ms typical timeout, 6.72s setup), supply current (6µA at 3.6V), and validated alternatives for brownout protection and front-panel reset coordination.

Technical Context

The MAX6450UT46L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.625V threshold (±130mV tolerance), while the second monitors RSTIN against a precise 0.630V internal reference, enabling external resistor-divider configuration for custom supply monitoring down to 0.63V. Both comparators drive a shared open-drain RESET output with guaranteed assertion down to VCC = 1.0V.

It implements dual extended-setup manual reset logic: MR1 and MR2 both require ≥6.72s low assertion (L-suffix) before triggering a 140ms–280ms one-shot RESET pulse; neither input is debounced for immediate response, distinguishing it from MAX6451/MAX6452 variants with mixed setup modes. The device operates across -40°C to +85°C and draws only 6µA at 3.6V.

Key Specifications

Pinout & Package

MAX6450UT46L is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with lead(Pb)-free construction (indicated by "+T" suffix; standard order uses "-T"). Pin 1 is GND, Pin 2 is VCC, Pin 3 is MR1, Pin 4 is MR2, Pin 5 is RSTIN, and Pin 6 is RESET.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT46L, MAX6450UT46L adds a second extended-setup MR input for enhanced reset security; compared with MAX6452UT46L, it trades immediate MR2 response for consistent dual extended-setup behavior - critical where accidental short-press resets must be eliminated entirely.

Availability

MAX6450UT46L is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, industrial control panels, and medical devices requiring stable component supply, long-term lifecycle support, and guaranteed performance across -40°C to +85°C.

Supply support for MAX6450UT46L 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 power, sensing, and interface applications, with emphasis on reliability and low-power operation.

The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in consumer and industrial systems where immunity to transients and user-induced nuisance resets is mandatory.

FAQ

What is the exact reset threshold voltage for MAX6450UT46L?

The MAX6450UT46L features a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed range of 4.50V to 4.75V at +25°C and ±130mV total tolerance over temperature. Its RSTIN input references a precise 0.630V internal comparator, enabling accurate external voltage monitoring via resistor divider. This dual-threshold architecture ensures reliable detection of both main supply brownout and auxiliary rail faults in the MAX6450UT46L.

How does the manual reset function work on MAX6450UT46L?

The MAX6450UT46L requires both MR1 and MR2 pins to be held low for a minimum of 6.72 seconds (L-suffix) before asserting the RESET output for 140ms–280ms. Neither input responds to short pulses - the extended setup period rejects switch bounce and accidental presses. Internal 50kΩ pullups ensure defined logic states when switches are open. This dual-input extended setup is a defining feature of the MAX6450UT46L, differentiating it from single-MR or immediate-MR variants.

Can MAX6450UT46L monitor voltages lower than its VCC supply?

Yes. While the VCC monitor tracks the 4.625V threshold, the RSTIN pin accepts an externally divided voltage referenced to the MAX6450UT46L's internal 0.630V comparator. Using high-value resistors (e.g., 250kΩ R2), designers can configure monitoring of voltages as low as 0.63V - such as 1.2V, 1.8V, or 2.5V rails - without loading the source. This capability is explicitly supported and characterized for the MAX6450UT46L across its full operating temperature range.

What is the supply current consumption of MAX6450UT46L?

The MAX6450UT46L draws only 6µA typical supply current at 3.6V and +25°C, with a maximum of 16µA over temperature. At 5.5V, ICC rises to 7µA typical / 20µA max. This ultra-low quiescent current enables use in battery-powered remote controls, always-on consumer devices, and energy-conscious industrial systems - a key specification confirmed in the official Electrical Characteristics table for the MAX6450UT46L.

Is MAX6450UT46L compatible with open-drain and push-pull microprocessor reset inputs?

Yes. The MAX6450UT46L provides an active-low open-drain RESET output, which interfaces directly with both open-drain and push-pull µP reset inputs. For push-pull compatibility, connect the RESET pin to the µP's reset input with a pullup resistor to the µP's VDDIO rail. The MAX6450UT46L's RESET pin tolerates up to 6V when deasserted, allowing safe interfacing across mixed-voltage systems - a verified design feature of the MAX6450UT46L.