Analog Devices Inc./Maxim Integrated MAX800LCUE

Overview

MAX800LCUE from Maxim Integrated is a microprocessor supervisory circuit providing power-on reset, watchdog timer, battery switchover, and chip-enable gating for 5V systems. It features 4.65V typical reset threshold, 200ms reset timeout, 30μA operating supply current, and guaranteed RESET assertion down to VCC = +1V - used in embedded controllers and intelligent instruments requiring reliable brownout protection.

For engineers reviewing the MAX800LCUE datasheet, MAX800LCUE pinout, MAX800LCUE application, or MAX800LCUE equivalent, this page delivers verified technical context, real-world timing behavior, battery-backup mode validation, CE signal propagation constraints, and precise reset threshold hysteresis - all confirmed for the TSSOP-16 package variant.

Technical Context

The MAX800LCUE implements dual-reset outputs (active-low RESET and active-high RESET), a programmable watchdog with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and an internal VCC/VBATT switchover comparator with ±60mV hysteresis. Its CE gating path uses a 75Ω series transmission gate with ≤10ns propagation delay under 50Ω/50pF test conditions.

It integrates a precision power-fail comparator (PFI threshold = 1.25V ±25mV) independent of reset logic, supports MaxCap®/SuperCap™ backup capacitors, and maintains functional validity across VCC = 1V to 5.5V - including full reset assertion at VCC = 1V with external 10kΩ pulldown on RESET.

Key Specifications

Pinout & Package

MAX800LCUE is housed in a 16-pin TSSOP package (JEDEC MO-153, 4.4mm × 5.0mm, 0.65mm pitch), lead-free compliant, rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX691ACUE, MAX800LCUE adds guaranteed ±2% power-fail accuracy and tighter reset threshold hysteresis; versus TPS3808G33DBVR, it delivers full 5V supervisory functionality including battery switchover, CE gating, and dual watchdog modes - making it irreplaceable in complex embedded controllers.

Availability

MAX800LCUE is available at Aetrix Electronics and suitable for industrial controllers, intelligent instrumentation, and critical μP power monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance.

Supply support for MAX800LCUE 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, computing, and communications applications.

The MAX800L family targets 5V microprocessor systems needing integrated reset, watchdog, battery switchover, and memory write protection - optimized for reliability in controllers and instrumentation with extended temperature operation.

FAQ

What is the guaranteed reset threshold voltage for MAX800LCUE?

The MAX800LCUE has a guaranteed reset threshold voltage of 4.50V (min), 4.65V (typ), and 4.75V (max) at TA = +25°C with VCC falling. This specification is validated across the full 0°C to +70°C operating range and ensures consistent brownout detection in 5V systems. The MAX800LCUE's reset threshold hysteresis is 15mV, preventing chatter near the trip point. All timing and voltage specs for MAX800LCUE are confirmed in the official Maxim Integrated datasheet revision 13.

Does MAX800LCUE support battery backup with supercapacitors?

Yes, MAX800LCUE is explicitly MaxCap® and SuperCap™ compatible per its datasheet. It supports seamless switchover from VCC to VBATT when VCC falls below the reset threshold and VBATT voltage exceeds VCC by >0.3V. The internal VBATT-to-VOUT on-resistance is 15Ω at 4.5V, 25Ω at 2.8V, and 30Ω at 2.0V - enabling direct connection to large-value backup capacitors without external FETs or diodes. This capability is fully characterized and guaranteed for MAX800LCUE.

How does the watchdog function behave when WDI is left unconnected on MAX800LCUE?

When WDI is left unconnected on MAX800LCUE, an internal voltage divider biases it to ~1.6V, which disables the watchdog function entirely. In this state, WDO remains high, and no watchdog timeout occurs - even during prolonged VCC stability. This behavior is documented in the "Watchdog Input" section of the MAX800LCUE datasheet and is inherent to the device's design. No external pull-up or pull-down is required to disable the watchdog on MAX800LCUE.

Can MAX800LCUE generate both active-high and active-low reset signals simultaneously?

Yes, MAX800LCUE provides two independent reset outputs: open-drain RESET (active-low) and open-drain RESET (active-high, inverse of RESET). Both are guaranteed valid down to VCC = +1V, and their timing is synchronized - RESET goes low and RESET goes high simultaneously upon reset assertion. This dual-output architecture allows direct interfacing with μPs requiring either polarity without level-shifting. The behavior is fully specified and tested for MAX800LCUE in the "RESET and RESET Outputs" section.

What is the maximum continuous output current supported by MAX800LCUE's VOUT pin?

MAX800LCUE supports a maximum continuous output current of 250mA from the VOUT pin when powered from VCC. At this load, the typical VCC-to-VOUT voltage drop is ≤200mV due to the 0.8–1.2Ω on-resistance of the internal PMOS switch. Peak currents up to 1A are allowed during power-up transients. When operating in battery-backup mode (VBATT-powered), the continuous current limit is reduced to 25mA - a hard specification confirmed in the Absolute Maximum Ratings table for MAX800LCUE.