Analog Devices Inc./Maxim Integrated MAX6823YUK+

Overview

MAX6823YUK+ from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring push-pull active-low RESET output, manual reset input (MR), and 1.6s watchdog timer. It monitors +2.19V supply with ±1% threshold accuracy over -40°C to +125°C, asserts reset for ≥140ms after VCC recovery, and guarantees valid reset operation down to VCC = +1.0V. Used in embedded controllers and portable equipment for reliable power-up/brownout protection.

For engineers reviewing the MAX6823YUK+ datasheet, MAX6823YUK+ pinout, MAX6823YUK+ application, or MAX6823YUK+ equivalent, this page delivers verified functional identity, exact reset threshold (2.19V), watchdog timeout (1.6s), reset timeout (140ms min), MR input behavior, and SOT23-5 pin mapping - all confirmed from Maxim's official datasheet Rev 2 (12/2005).

Technical Context

The MAX6823YUK+ implements a dual-stage reset generator: first, voltage monitoring triggers reset when VCC falls below 2.19V (Y-suffix); second, an internal monostable keeps RESET asserted for ≥140ms after VCC exceeds threshold. Its watchdog circuit detects WDI inactivity beyond 1.6s (typ) and clears on any edge or reset assertion.

MR input includes a 50kΩ internal pullup and accepts CMOS-level signals; it forces reset while low and holds reset for the full timeout after release. RESET output is push-pull active-low with VOL ≤ 0.4V at 3.2mA sink and VOH ≥ 0.8×VCC at 800µA source, guaranteed functional down to VCC = +1.0V.

Key Specifications

Pinout & Package

MAX6823YUK+ uses a 5-pin SOT23-5 package with gull-wing leads, 1.27mm pitch, and JEDEC MO-178AC outline. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6822YUK+, MAX6823YUK+ eliminates external pullup components and simplifies layout; versus TPS3808G18DBVR, it provides tighter threshold matching for +2.2V rails, integrated MR, and always-enabled watchdog - critical for safety-critical restart assurance.

Availability

MAX6823YUK+ is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, automotive systems, and critical µP monitoring requiring stable component supply across extended temperature ranges.

Supply support for MAX6823YUK+ 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 industrial, automotive, and communications applications.

The MAX682x family targets space-constrained, reliability-critical systems needing integrated voltage monitoring, manual reset, and watchdog functionality in ultra-small SOT23-5 packages.

FAQ

What is the exact reset threshold voltage for MAX6823YUK+?

The MAX6823YUK+ has a factory-trimmed reset threshold of 2.19V, with tolerance of ±1% over the full -40°C to +125°C temperature range. This value is confirmed in the Threshold Suffix Guide (Y = 2.19V) and electrical characteristics table of the official datasheet Rev 2. The device asserts active-low RESET when VCC falls below this threshold and holds it for ≥140ms after VCC rises above it. MAX6823YUK+ maintains this specification across its entire operating voltage range down to VCC = +1.0V.

Does MAX6823YUK+ include a manual reset input, and how does it behave?

Yes, MAX6823YUK+ includes an active-low manual reset input (MR) on Pin 3. It features a 50kΩ internal pullup to VCC, so the pin can be left unconnected if unused. When pulled low (e.g., via momentary switch to GND), MR immediately asserts RESET and holds it active for the full 140ms timeout period after MR returns high. MR accepts standard CMOS logic levels and requires no external debounce circuitry. This behavior is identical across MAX6823YUK+, MAX6821YUK+, and MAX6822YUK+, as confirmed in the Selector Guide and Pin Description sections.

What is the watchdog timeout period of MAX6823YUK+, and how is it cleared?

The MAX6823YUK+ watchdog timeout period is 1.6s nominal (0.8s to 2.6s over temperature), as specified in the Electrical Characteristics table. The internal timer is cleared by any rising or falling edge on the WDI pin (Pin 4), by assertion of RESET (e.g., due to VCC drop or MR), or by the internal watchdog service pulse when WDI is unconnected. If WDI remains static beyond the timeout, RESET is asserted for 140ms. The watchdog is disabled when WDI is left floating or three-stated, as documented in the Detailed Description section.

Can MAX6823YUK+ operate reliably at VCC = +1.0V?

Yes, MAX6823YUK+ guarantees correct RESET output state (valid logic levels and timing) down to VCC = +1.0V, as explicitly stated in the General Description and Electrical Characteristics tables. At VCC ≥ 1.0V, RESET output LOW is specified at ≤0.4V (with 3.2mA sink), and RESET output HIGH is ≥0.8×VCC (with 800µA source). This capability ensures fail-safe reset assertion during deep brownout events where other supervisors may lose functionality - a key differentiator confirmed across all MAX6821–MAX6825 variants.

What package type and pin configuration does MAX6823YUK+ use?

MAX6823YUK+ uses a 5-pin SOT23-5 package (JEDEC MO-178AC outline) with gull-wing leads and 1.27mm pitch. Pin 1 is active-low push-pull RESET, Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), and Pin 5 is VCC. This pinout is identical to MAX6821YUK+ and MAX6822YUK+, as shown in the Pin Configurations diagram and Pin Description table of the datasheet. The "UK" in the part number denotes the SOT23-5 package variant.