Analog Devices Inc./Maxim Integrated MAX6419UK16

Overview

MAX6419UK16 from Maxim Integrated is an active-high, push-pull microprocessor supervisor IC designed for dual-voltage monitoring in automotive and industrial embedded systems. It features a factory-trimmed VCC reset threshold of 1.575V (±2.5%), an adjustable RESET IN input monitoring down to 1.26V, capacitor-programmable reset timeout (275µs to >10ms), 1.7µA typical quiescent current, and guaranteed valid reset operation down to VCC = 1V.

For engineers reviewing the MAX6419UK16 datasheet, MAX6419UK16 pinout, MAX6419UK16 application, or MAX6419UK16 equivalent, key selection considerations include its dual-threshold architecture, SOT23-5 package compatibility, active-high push-pull output logic, temperature-stable reset timing across –40°C to +125°C, and manual reset capability via external switch integration on RESET IN.

Technical Context

The MAX6419UK16 implements dual independent voltage monitoring: a laser-trimmed internal comparator for VCC (1.575V nominal) and an externally resistor-divider-configurable comparator for RESET IN (threshold set by VRST = 1.26V). Reset assertion occurs if either voltage falls below its respective threshold or if MR is asserted.

Its reset timeout is generated by a precision 240nA current source charging an external capacitor (CSRT) to a 0.65V internal reference; deassertion requires full ramp completion. The active-high push-pull RESET output drives high after timeout with VOH ≥ 0.8×VCC (at ISOURCE = 800µA, VCC ≥ 4.5V) and VOL ≤ 0.4V (at ISINK = 3.2mA, VCC ≥ 4.5V).

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free option available (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6413UK16-T and TPS3808G16DBVR, the MAX6419UK16 uniquely delivers dual-rail supervision in the same SOT23-5 package while maintaining the lowest quiescent current - critical for battery longevity in portable medical and metering applications requiring simultaneous core/I/O rail monitoring.

Availability

MAX6419UK16 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and portable medical sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6419UK16 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 demanding industrial, automotive, and computing applications.

The MAX6412–MAX6420 product line delivers low-power, capacitor-programmable microprocessor supervisors optimized for dual-voltage monitoring in harsh-environment embedded systems where reliability, small size, and ultra-low current are mandatory.

FAQ

What is the exact VCC reset threshold voltage for MAX6419UK16?

The MAX6419UK16 has a factory-trimmed VCC reset threshold of 1.575V, with a tolerance of ±2.5% over the full –40°C to +125°C temperature range. This value is confirmed in Table 1 of the datasheet (suffix "16") and verified in the Electrical Characteristics table under VTH parameter. The MAX6419UK16 uses laser trimming to achieve this precision without external components.

How do I configure the adjustable RESET IN input on MAX6419UK16?

To configure the adjustable RESET IN input on MAX6419UK16, connect an external resistor divider between VCC and GND, with the center tap connected to the RESET IN pin. Use VRST = 1.26V as the internal reference: VMON_TH = 1.26V × (R1 + R2)/R2. For example, to monitor 3.3V, select R2 = 1MΩ and calculate R1 = 1MΩ × (3.3/1.26 − 1) ≈ 1.62MΩ. The MAX6419UK16 datasheet Figure 1 provides the full derivation.

Does MAX6419UK16 support manual reset functionality?

Yes, the MAX6419UK16 supports manual reset via its MR pin (Pin 4), which is active-low and internally pulled up to VCC with a 20kΩ resistor. Pulling MR to GND asserts RESET for the full timeout period, then releases it automatically. Unlike MAX6412–MAX6414, the MAX6419UK16 does not have a dedicated MR pin; instead, manual reset is implemented by shorting RESET IN to GND using a momentary switch in parallel with R2 - a method explicitly validated in the MAX6419UK16 datasheet Figure 2.

What capacitor value sets a 10ms reset timeout for MAX6419UK16?

To set a 10ms reset timeout for MAX6419UK16, use CSRT = (tRP − 275µs) / 2.73×10⁶, where tRP = 0.01s. This yields CSRT ≈ (0.01 − 0.000275) / 2.73×10⁶ ≈ 3.56nF. A standard 3.6nF ceramic capacitor (low-leakage, X7R/C0G) is recommended. The MAX6419UK16 datasheet Figure 3 and Application Information section confirm this calculation and specify <10nA leakage for stability.

Is MAX6419UK16 compatible with 1.2V logic systems?

The MAX6419UK16 itself operates down to VCC = 1.0V and guarantees valid RESET output for VCC ≥ 1V, but its RESET output is rail-referenced: VOH ≥ 0.8×VCC and VOL ≤ 0.4V. At VCC = 1.2V, VOH ≈ 0.96V - insufficient to drive a standard 1.2V logic-high threshold (typically ≥ 0.84V for LVCMOS12, but marginally compliant). For robust 1.2V interface, use a level-shifter or select a supervisor with dedicated low-voltage IO - the MAX6419UK16 is optimized for 1.5V+ systems per its 1.575V VCC threshold and datasheet operating conditions.