Analog Devices Inc./Maxim Integrated MAX6317HUK46CY

Overview

MAX6317HUK46CY from Maxim Integrated is an active-high, push/pull microprocessor supervisory circuit with manual reset and watchdog timer functionality. It monitors VCC (1.0V–5.5V), asserts reset when VCC drops below 4.63V (±2.5% over temperature), provides 140ms minimum reset timeout, and features 1.6s typical watchdog timeout. Used in embedded control systems to ensure reliable power-up sequencing and software fault recovery.

For engineers reviewing the MAX6317HUK46CY datasheet, MAX6317HUK46CY pinout, MAX6317HUK46CY application, or MAX6317HUK46CY equivalent, key selection criteria include its active-high reset output stage, factory-trimmed 4.63V threshold, guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, and compatibility with Motorola 68HC11-style bidirectional reset buses via external configuration.

Technical Context

The MAX6317HUK46CY implements a precision voltage monitor using a factory-laser-trimmed resistor divider to set VRST = 4.63V, with ±2.5% tolerance over –40°C to +125°C and 40ppm/°C temperature coefficient. Its reset generator guarantees valid logic-high RESET output for VCC ≥ 1.0V, and its watchdog circuit clears on any WDI edge (rising or falling) with 50ns minimum pulse width detection.

Reset assertion occurs on VCC dropout below VRST, MR low assertion, or WDI timeout (1.6s typ). After trigger release, reset remains active for 140ms min before deassertion, and the watchdog timer restarts immediately upon reset deassertion. The device integrates internal 52kΩ MR pullup and requires no external components for basic operation.

Key Specifications

Pinout & Package

MAX6317HUK46CY is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6317HUK46CY, MAX6321HPUK46CY-T offers open-drain flexibility at the cost of added external component count, while TLV809E46DBZR reduces complexity and size but sacrifices fault-monitoring capability-making MAX6317HUK46CY optimal for robust, feature-complete supervision in industrial and automotive control.

Availability

MAX6317HUK46CY is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, smart energy meters, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6317HUK46CY 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, automotive, and communications markets.

The MAX6316–MAX6322 family was designed specifically for reliable microprocessor supervision in harsh environments-delivering precision voltage monitoring, watchdog safety, and manual reset in miniature SOT23 packages with guaranteed operation down to 1V.

FAQ

What is the exact reset threshold voltage of MAX6317HUK46CY and how tightly is it specified?

The MAX6317HUK46CY has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full –40°C to +125°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official MAX6316–MAX6322 datasheet (Rev 9, page 2), and the 40ppm/°C temperature coefficient ensures minimal drift across thermal cycles. The "46" in the part number directly references the 4.63V threshold per Table 1.

Does MAX6317HUK46CY support operation during severe brownout conditions?

Yes, MAX6317HUK46CY guarantees valid reset output levels down to VCC = 1.0V. Its active-high push/pull RESET output maintains VOH ≥ 0.8×VCC and VOL ≤ 0.4V across the entire 1.0V–5.5V supply range, enabling deterministic behavior during deep brownout. This is explicitly stated in the General Description and verified in the Electrical Characteristics table (page 2) under "Operating Voltage Range" and "RESET Output Voltage" parameters.

How does the watchdog function work on MAX6317HUK46CY and what is its timeout period?

The MAX6317HUK46CY watchdog timer times out after 1.6s (typical), corresponding to suffix "Y" per Table 3. It clears on any rising or falling edge at the WDI pin-detecting pulses as short as 50ns-and automatically disables when WDI is left unconnected. The timer restarts immediately upon RESET deassertion. This behavior is documented in the Detailed Description (page 6) and Electrical Characteristics (page 3) sections of the datasheet.

Can MAX6317HUK46CY be used with microcontrollers that require active-low reset inputs?

No-MAX6317HUK46CY provides only an active-high, push/pull RESET output. For active-low reset requirements, alternatives like MAX6321HPUK46CY-T (open-drain active-low) or MAX6316LUK46CY-T (push/pull active-low) should be selected. The "H" in MAX6317HUK46CY explicitly denotes active-high output, as defined in the Selector Guide (page 1) and Pin Description (page 5).

What is the purpose of the MR (manual reset) pin on MAX6317HUK46CY and how is it configured?

The MR pin on MAX6317HUK46CY is an active-low manual reset input with an internal 52kΩ pullup resistor to VCC, allowing it to be left unconnected when unused. Driving MR low forces a reset for the full 140ms timeout period. It accepts TTL/CMOS logic levels and rejects 100ns transients. This functionality is detailed in the Pin Description (page 5) and Applications Information (page 9) sections of the datasheet.