Analog Devices Inc./Maxim Integrated MAX6464XR46+T

Overview

MAX6464XR46+T from Maxim Integrated is a micropower supervisory circuit with active-high push-pull output, 4.6V lower trip threshold (VTH−), and 150ms minimum reset timeout period. It monitors VCC supply voltage in battery-powered systems, asserts reset when VCC drops below 4.555V (min, −40°C to +125°C), and holds reset for ≥150ms after VCC rises above 4.735V (min). Used in portable medical devices and cellular phones for reliable power-on reset sequencing.

For engineers reviewing the MAX6464XR46+T datasheet, MAX6464XR46+T pinout, MAX6464XR46+T application, or MAX6464XR46+T equivalent, key selection criteria include guaranteed 150ms timeout, ±2.5% threshold accuracy over temperature, ultra-low 1.0µA supply current at 3.6V, and SC70-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6464XR46+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set its factory-trimmed 4.6V VTH− threshold. Its internal 5% hysteresis ensures VTH+ = VTH− × 1.05 (4.735V min), preventing output chatter during slow-rising or noisy supply conditions.

As a µP supervisory variant (not a simple voltage detector), it integrates a monostable timeout circuit that guarantees minimum 150ms reset assertion after VCC recovery - independent of propagation delay - making it suitable for microcontroller initialization where deterministic hold time is mandatory.

Key Specifications

Pinout & Package

MAX6464XR46+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for ultra-compact portable designs. Pin 1 = OUT (active-high push-pull), Pin 2 = GND, Pin 3 = VCC. No NC or auxiliary pins - minimal footprint with full supervisory functionality.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with TPS3808G33DBVR and ADM6315-46DARTZ-RL, the MAX6464XR46+T uniquely delivers 4.6V detection with active-high push-pull output and guaranteed 150ms hold time in a 3-pin SC70 - enabling direct replacement in space-critical 5V systems without layout or firmware changes.

Availability

MAX6464XR46+T is available at Aetrix Electronics and suitable for portable medical devices, cellular handsets, and industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6464XR46+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 management, sensing, and interface applications in demanding environments.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power supervisory functions in battery-operated and thermally harsh systems - prioritizing nanoscale current draw, factory-trimmed accuracy, and minimal footprint.

FAQ

What is the exact VTH− and VTH+ voltage range for MAX6464XR46+T over temperature?

The MAX6464XR46+T has a lower trip threshold (VTH−) of 4.555V minimum and 4.645V maximum over −40°C to +125°C. Its upper trip threshold (VTH+) is 4.735V minimum and 4.828V maximum in the same range, reflecting the guaranteed 5% hysteresis (VTH+ = VTH− × 1.05). These values are factory-trimmed and documented in Table 1a and 1b of the MAX6464XR46+T datasheet.

Does MAX6464XR46+T require an external pull-up resistor on the OUT pin?

No, the MAX6464XR46+T features an active-high push-pull output stage, so it actively drives logic-high when not asserting reset and does not require an external pull-up resistor. This distinguishes it from open-drain variants like MAX6466XR46+T and simplifies PCB layout by eliminating one passive component.

Can MAX6464XR46+T be used to monitor a 5V rail while powered from a separate 3.3V supply?

No - the MAX6464XR46+T uses a single VCC pin for both power and voltage monitoring. It cannot monitor a voltage higher than its own supply. To supervise a 5V rail, MAX6464XR46+T must be powered from that same 5V rail. For independent supply monitoring, consider a dedicated high-side supervisor or resistive divider solution.

What is the minimum VCC voltage required for MAX6464XR46+T to operate correctly?

The MAX6464XR46+T operates down to VCC = 1.2V per Absolute Maximum Ratings, but functional supervision begins only when VCC exceeds the internal bandgap reference requirement. For reliable 4.6V threshold detection, VCC must remain ≥ 4.6V during normal operation; the device asserts reset when VCC falls below 4.555V (min) and remains asserted until VCC rises above 4.735V (min).

Is MAX6464XR46+T pin-compatible with other members of the MAX6461–MAX6466 family in SC70-3 packages?

Yes - all SC70-3 variants (e.g., MAX6461XR46+T, MAX6462XR46+T, MAX6464XR46+T) share identical pinout (OUT-GND-VCC) and footprint. However, function differs: MAX6464XR46+T provides 150ms timeout, while MAX6461XR46+T is a voltage detector with 17µs propagation delay. Swapping requires firmware and timing validation.