Analog Devices Inc./Maxim Integrated MAX6450UT23L

Overview

MAX6450UT23L from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.313V) and one adjustable-threshold (0.63V reference) voltage monitor, two 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 consumer electronics and industrial embedded systems where nuisance resets must be avoided.

For engineers reviewing the MAX6450UT23L datasheet, MAX6450UT23L pinout, MAX6450UT23L application, or MAX6450UT23L 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 - all mapped to the precise SOT23-6 package and -40°C to +85°C operating range.

Technical Context

The MAX6450UT23L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.313V threshold (±1.5% over temperature), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference with 2.5mV hysteresis. Both comparators drive a shared open-drain RESET output that asserts low for ≥140ms after any monitored supply falls below its threshold or after MR1 and MR2 are held low simultaneously for ≥6.72s.

Its dual extended-setup manual reset architecture requires both MR1 and MR2 to be pulled low for the full tMR period before asserting RESET - eliminating false triggers from momentary switch closures - and supports high-impedance RSTIN monitoring (±25nA input current) for ultra-low-power applications like battery-powered set-top boxes and medical devices.

Key Specifications

Pinout & Package

MAX6450UT23L is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT23L, MAX6450UT23L adds MR2 for enhanced reset security; compared with MAX6452UT23L, it provides open-drain flexibility for multi-device reset coordination - making MAX6450UT23L optimal for systems requiring both robust manual reset and interoperable reset signaling.

Availability

MAX6450UT23L is available at Aetrix Electronics and suitable for set-top box manufacturing, DVD player production, and industrial PLC design requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX6450UT23L 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in noisy, space-constrained environments - emphasizing immunity to transients, ultra-low power, and configurable reset timing to eliminate system instability during power transitions.

FAQ

What is the exact VCC reset threshold voltage for MAX6450UT23L?

The MAX6450UT23L has a factory-trimmed VCC reset threshold of 2.313V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix "23", and is guaranteed by production testing - not typical or nominal. The threshold remains stable with 60ppm/°C tempco and includes 2×VTH hysteresis for noise immunity.

Does MAX6450UT23L support monitoring a 1.2V supply rail?

Yes, MAX6450UT23L supports monitoring a 1.2V supply using its RSTIN pin. With a precise 0.630V internal reference and high-impedance input (±25nA), it interfaces with an external resistor divider - for example, R1 = 220kΩ and R2 = 250kΩ yields VMON-TH ≈ 1.2V. The RSTIN threshold hysteresis is 2.5mV, ensuring clean transition without chatter during rail ramp-up or droop.

What is the function of MR2 on MAX6450UT23L?

On MAX6450UT23L, MR2 is an active-low manual reset input with 50kΩ internal pullup to VCC. It operates in strict conjunction with MR1: both MR1 and MR2 must be held low for ≥6.72s (L-suffix) to assert the RESET output. This dual-input requirement prevents accidental resets - unlike MR2 on MAX6451/MAX6452, MR2 on MAX6450UT23L does not support immediate assertion.

Can MAX6450UT23L operate with VCC as low as 1.0V?

Yes, MAX6450UT23L is fully functional and guarantees valid RESET output behavior down to VCC = 1.0V. Its internal comparators and logic remain operational at this level, and the open-drain RESET can sink 50µA while maintaining VOL ≤ 0.3V. Below 1.0V, RESET behavior is not guaranteed - consistent with the Absolute Maximum Ratings and Electrical Characteristics tables.

What package type and dimensions does MAX6450UT23L use?

MAX6450UT23L uses a 6-pin SOT23 package (package code U6-1, outline 21-0058, land pattern 90-0175), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. It is RoHS-compliant (lead-free), and the "-T" suffix denotes tape-and-reel packaging with 2500-piece minimum order quantity. No thermal pad is present - the exposed die pad is electrically isolated.