Analog Devices Inc./Maxim Integrated MAX6450UT23L-T

Overview

MAX6450UT23L-T 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 (t_MR = 6.72s), open-drain active-low RESET output, and guaranteed operation down to V_CC = 1.0V - used in set-top boxes and cable modems for reliable brownout and pushbutton-initiated system reset.

For engineers reviewing the MAX6450UT23L-T datasheet, MAX6450UT23L-T pinout, MAX6450UT23L-T application, or MAX6450UT23L-T equivalent, this page delivers verified specifications including 6µA supply current, 210ms typical reset timeout, SOT23-6 package mapping, RSTIN adjustable threshold interface, and confirmed alternative parts with functional distinctions.

Technical Context

The MAX6450UT23L-T integrates two independent reset comparators: one monitors V_CC against a factory-trimmed 2.313V threshold (±1.5% over -40°C to +85°C), 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.

It implements dual extended-setup manual reset logic: MR1 and MR2 must both be held low ≥6.72s (L-suffix) to trigger a 140ms–280ms one-shot RESET pulse; transient immunity rejects <100ns glitches on MR inputs, and RSTIN-to-RESET delay is 15µs (typ) with 1mV/µs edge rate.

Key Specifications

Pinout & Package

MAX6450UT23L-T is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and lead(Pb)-free construction (RoHS compliant). Pin 1 is marked with a dot; device orientation follows standard SOT23 top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT23L-T, MAX6450UT23L-T adds RSTIN for dual-rail supervision; compared with MAX6452UT23L-T, it omits immediate MR2 response - making MAX6450UT23L-T optimal for applications requiring strict dual-button confirmation without interrupt capability.

Availability

MAX6450UT23L-T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, and DVD players requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for MAX6450UT23L-T 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 equipment where immunity to switch bounce, brownout, and transient noise is critical.

FAQ

What is the exact V_CC reset threshold voltage for MAX6450UT23L-T?

The MAX6450UT23L-T has a factory-trimmed V_CC reset threshold of 2.313V, with ±1.5% tolerance over -40°C to +85°C. This value is defined by the "23" suffix per Table 1 and is guaranteed in production testing - not derived from external components or calibration.

Does MAX6450UT23L-T support monitoring a 1.2V supply?

Yes. The MAX6450UT23L-T uses its RSTIN pin with a 0.630V internal reference to monitor 1.2V supplies: configure an external resistor divider (e.g., R1 = 220kΩ, R2 = 250kΩ) so that 1.2V at RSTIN produces 0.63V at the comparator input, enabling precise 1.2V brownout detection.

What is the minimum pullup resistor value for the open-drain RESET output of MAX6450UT23L-T?

The MAX6450UT23L-T RESET output requires a minimum 20kΩ pullup resistor to V_CC (or compatible logic rail) to ensure proper high-level voltage and sink capability. At V_CC ≥4.25V, it can sink up to 3.2mA while maintaining VOL ≤0.4V - critical for driving legacy µP reset inputs.

Can MAX6450UT23L-T generate a reset pulse if only MR1 is asserted without MR2?

No. The MAX6450UT23L-T requires both MR1 and MR2 to be held low simultaneously for ≥6.72s (L-suffix) to initiate a reset pulse. Asserting only MR1 has no effect - this dual-input requirement is hardwired in the IC's logic and prevents accidental resets from single-point failures or miswiring.

Is MAX6450UT23L-T qualified for automotive applications?

No. MAX6450UT23L-T is rated for -40°C to +85°C operation and is not AEC-Q100 qualified. Automotive-grade variants (e.g., MAX6444US23L/V+T) exist in the same family but carry the "/V" suffix and undergo additional qualification testing - MAX6450UT23L-T is intended for industrial and consumer use only.