Analog Devices Inc./Maxim Integrated MAX6366HKA46+T

Overview

The MAX6366HKA46+T from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors +4.63V supply (±0.13V tolerance), asserts an open-drain active-high RESET output on VCC brownout or watchdog timeout, and switches OUT between VCC and backup battery (VBATT) with 40mV hysteresis - used in portable POS terminals and industrial controllers requiring reliable power-fail recovery.

For engineers reviewing the MAX6366HKA46+T datasheet, MAX6366HKA46+T pinout, MAX6366HKA46+T application, or MAX6366HKA46+T equivalent, key selection criteria include its 1.6s watchdog timeout, 4.63V factory-trimmed reset threshold, 150ms minimum reset timeout period, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained embedded systems.

Technical Context

The MAX6366HKA46+T implements a precision voltage monitor with ±1.5% threshold accuracy over -40°C to +85°C, a monostable watchdog timer with 1.00–2.25s timeout range (typ. 1.65s), and bidirectional VCC/BATT switchover logic that activates only when VCC falls below both VTH (4.63V) and VBATT by ≥20mV. Its CE IN-to-CE OUT transmission gate provides 1.5ns propagation delay and 20–100Ω on-resistance during normal operation.

RESET is an open-drain active-high output asserted continuously during VCC undervoltage or pulsed upon watchdog timeout; it remains asserted for ≥150ms after VCC recovers. The WDI input detects edges (rising/falling) or sustained high/low states >1.6s to trigger reset, with 100ns minimum pulse width immunity and ±1.0µA input leakage.

Key Specifications

Pinout & Package

MAX6366HKA46+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead(Pb)-free, with thermal pad omitted. Pin 1 is marked by a dot; device orientation follows JEDEC MO-178AB standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6366HKA44+T and TPS3808G33DBVR, the MAX6366HKA46+T uniquely combines 4.63V precision monitoring, 1.65s watchdog, and seamless VCC/BATT switchover in a single SOT23-8 package - essential for applications requiring guaranteed data retention during extended power loss.

Availability

MAX6366HKA46+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, smart energy meters, and POS terminals requiring stable component supply with long-term lifecycle support.

Supply support for MAX6366HKA46+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 connectivity in industrial, automotive, and computing applications.

The MAX6365–MAX6368 family delivers ultra-low-power supervisory functions with integrated battery switchover and chip-enable gating - engineered specifically for memory-critical embedded systems where data integrity during power anomalies is non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6366HKA46+T?

The MAX6366HKA46+T has a factory-trimmed reset threshold of 4.63V, with guaranteed minimum and maximum values of 4.50V and 4.75V respectively across -40°C to +85°C. This precise threshold ensures reliable detection of +5V supply collapse while avoiding false resets due to normal ripple or load transients.

Does the MAX6366HKA46+T support battery backup for SRAM, and how does switchover work?

Yes, the MAX6366HKA46+T supports battery backup for SRAM via its OUT pin. Switchover occurs automatically when VCC falls below both the 4.63V reset threshold and VBATT by at least 20mV. The internal MOSFET connects BATT to OUT with <4.6Ω on-resistance at VBATT=3.0V, enabling up to 20mA continuous backup current.

What is the watchdog timeout behavior of the MAX6366HKA46+T, and how is it triggered?

The MAX6366HKA46+T features a 1.65s typical watchdog timeout (1.00–2.25s range). It triggers a reset pulse when the WDI input remains static (high or low) longer than this period. Edges (rising/falling) or pulses ≥100ns reset the timer - enabling flexible firmware integration without strict timing constraints.

Can the MAX6366HKA46+T drive standard CMOS SRAM chip-enable signals directly?

Yes, the MAX6366HKA46+T drives CE signals directly via its CE IN/CE OUT path. With 1.5ns propagation delay, 20–100Ω on-resistance, and 12µs hold time on CE OUT during reset assertion, it meets timing requirements for common 5V and 3.3V SRAMs - eliminating need for external gating logic.

What package type and environmental rating does the MAX6366HKA46+T use?

The MAX6366HKA46+T uses an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead(Pb)-free. It operates across -40°C to +85°C industrial temperature range, with guaranteed performance including 4.63V threshold accuracy, 150ms reset timeout, and 10µA supply current throughout this range.