Analog Devices Inc./Maxim Integrated MAX6450UT16L+T

Overview

The MAX6450UT16L+T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (1.575V) and one adjustable-threshold (0.63V reference) voltage monitor, two extended-setup manual reset inputs (MR1/MR2), open-drain active-low RESET output, and 6.72s minimum manual reset setup period - designed for reliable system reset control in consumer set-top boxes and industrial equipment where nuisance resets must be eliminated.

For engineers reviewing the MAX6450UT16L+T datasheet, MAX6450UT16L+T pinout, MAX6450UT16L+T application, or MAX6450UT16L+T equivalent, key selection considerations include its dual manual reset architecture with long tMR timing, 0.63V RSTIN reference enabling sub-1V monitoring, guaranteed RESET validity down to VCC = 1.0V, and SOT23-6 package compatibility with high-density PCB layouts.

Technical Context

This device implements a precision dual-monitoring architecture: VCC is compared against a factory-trimmed 1.575V threshold (±1.5% over temperature), while RSTIN uses an internal 0.63V bandgap reference to monitor externally divided voltages down to 0.63V with ±0.8mV hysteresis. Both comparators feed into a digital state machine that enforces strict timing discipline.

The manual reset logic requires MR1 and MR2 to be held low simultaneously for ≥6.72s (L-suffix) before asserting RESET for 140ms minimum; transient immunity is ensured via 100ns glitch rejection on MR2 and 210ms debouncing on MR2 rising edges - eliminating false triggers from switch bounce or EMI.

Key Specifications

Pinout & Package

MAX6450UT16L+T is housed in a 6-pin SOT23 package (U6+1 outline), footprint-compatible with industry-standard 0.95mm pitch land patterns (Maxim land pattern 90-0175). The package supports reflow soldering per JEDEC J-STD-020 (lead-free: +260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT16L+T, the MAX6450UT16L+T adds MR2 for dual-button reset security; versus TPS3808G15DBVR, it provides adjustable RSTIN monitoring and longer reset timeout - making it optimal for multi-rail industrial systems requiring robust human-initiated recovery.

Availability

MAX6450UT16L+T is available at Aetrix Electronics and suitable for set-top box manufacturing, DVD player production, cable modem assembly, industrial PLC design, and medical imaging equipment requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6450UT16L+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) 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 environments - emphasizing long manual reset setup periods, dual-supply monitoring, and guaranteed operation across extended temperature ranges.

FAQ

What is the exact reset threshold voltage for MAX6450UT16L+T?

The MAX6450UT16L+T has a factory-trimmed VCC reset threshold of 1.575V (±1.5% over -40°C to +85°C), corresponding to the "16" suffix in its part number. Its RSTIN input uses a precise 0.630V internal reference, enabling accurate monitoring of external voltages via resistor divider networks - both thresholds are fully specified and production-tested.

How does the dual manual reset function work on MAX6450UT16L+T?

The MAX6450UT16L+T requires both MR1 and MR2 pins to be held low simultaneously for ≥6.72 seconds (L-suffix timing) before asserting the open-drain RESET output for ≥140ms. This dual-input requirement prevents accidental resets - for example, a technician must press two distinct front-panel buttons concurrently to initiate system recovery, enhancing operational safety in deployed equipment.

Can MAX6450UT16L+T monitor a 1.0V core supply?

Yes - the MAX6450UT16L+T can monitor a 1.0V supply using its RSTIN pin. With the internal 0.630V reference, a simple resistor divider (e.g., R1 = 187kΩ, R2 = 316kΩ) sets the trip point precisely at 1.0V (VMON-TH = 0.63 × (187k + 316k)/316k). The RSTIN input draws only ±25nA, ensuring minimal loading on sensitive low-voltage rails.

What is the minimum VCC required for MAX6450UT16L+T to assert a valid RESET signal?

The MAX6450UT16L+T guarantees valid RESET output down to VCC = 1.0V. Below this voltage, current-sinking capability degrades, but within the 1.0V–5.5V operating range, RESET remains fully functional - including proper logic levels, timing accuracy, and noise immunity. This ensures reliable reset signaling during deep brownout conditions common in battery-powered or PoE systems.

Is MAX6450UT16L+T compatible with lead-free reflow processes?

Yes - the MAX6450UT16L+T carries the "+" suffix indicating RoHS-compliant, lead-free packaging. It is qualified for JEDEC J-STD-020 reflow profiles with peak temperature of +260°C (10-second duration), matching standard lead-free assembly requirements. The SOT23-6 package uses matte tin plating and meets IPC/JEDEC moisture sensitivity level 1 (MSL-1).