Analog Devices Inc./Maxim Integrated MAX16020LTEL+T

Overview

MAX16020LTEL+T from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and power-fail monitoring. It provides active-low reset output, 145ms minimum reset timeout, 1.2µA supply current, and operates from 1.53V to 5.5V to protect SRAM/RTC in brownout conditions.

For engineers reviewing the MAX16020LTEL+T datasheet, MAX16020LTEL+T pinout, MAX16020LTEL+T application, or MAX16020LTEL+T equivalent, key selection criteria include its 3.100V fixed reset threshold (suffix 'T'), 16-pin TQFN package, CEIN-to-CEOUT 1.5ns propagation delay, and support for battery-backed memory write protection in GPS and industrial control systems.

Technical Context

The MAX16020LTEL+T implements a dual-path power-switching architecture: VCC connects to OUT during normal operation, while BATT automatically takes over when VCC falls below 3.100V and VBATT exceeds VCC. Its internal CE gating latches CEIN state on reset assertion and holds CEOUT low for 12µs if CEIN is low at reset onset.

It integrates a 1.2s watchdog timer with WDI edge-triggered clearing, a 0.590V power-fail comparator (PFI) with 30mV hysteresis, and a low-line (LL) output that asserts 2.5% above the reset threshold to enable early NMI-based shutdown sequencing.

Key Specifications

Pinout & Package

MAX16020LTEL+T uses a 16-pin TQFN package with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables reliable operation under sustained load in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16021LTEL+T and TPS3808G33DBVR, the MAX16020LTEL+T uniquely combines 3.100V reset accuracy, integrated CE gating, and full battery-management signaling (BATTON/BATTOK/BATT_TEST) in a single 16-pin TQFN - making it irreplaceable for space-constrained, battery-backed memory systems requiring deterministic write protection.

Availability

MAX16020LTEL+T is available at Aetrix Electronics and suitable for industrial control, GPS modules, and point-of-sale equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX16020LTEL+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, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX16020 series targets µP-based systems needing integrated power supervision, battery backup, and memory write protection - specifically engineered for reliability-critical embedded devices with constrained board space.

FAQ

What is the exact reset threshold voltage for MAX16020LTEL+T?

The MAX16020LTEL+T has a fixed reset threshold of 3.100V (typical), with guaranteed range of 3.010V to 3.190V per Table 1b. This value is defined by the 'T' suffix and applies across the full -40°C to +85°C operating temperature range with ±0.5% typical drift.

Does MAX16020LTEL+T support battery-backed SRAM write protection?

Yes, the MAX16020LTEL+T provides hardware-enforced write protection via its CEIN/CEOUT gating circuit. When RESET asserts, CEOUT is disabled within 12µs if CEIN is low, preventing spurious writes to SRAM during brownout - a core function confirmed in the Functional Diagrams and Detailed Description sections.

What is the purpose of the BATT_TEST pin on MAX16020LTEL+T?

The BATT_TEST pin on MAX16020LTEL+T outputs a 1.3s open-drain low pulse every 24 hours to activate an external load for battery health verification. It works in conjunction with BATTOK to detect VBATT < 2.6V, enabling predictive battery replacement without user intervention.

Can MAX16020LTEL+T operate with a 1.8V main supply?

Yes, MAX16020LTEL+T operates from 1.53V to 5.5V, fully supporting 1.8V systems. Its reset threshold remains fixed at 3.100V, so it monitors auxiliary rails (e.g., 3.3V or 5V) while being powered from a lower VCC - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the LL (low-line) output differ from the RESET output on MAX16020LTEL+T?

The LL output on MAX16020LTEL+T asserts at 3.178V (2.5% above the 3.100V reset threshold) to provide early warning of impending power failure, whereas RESET asserts only at 3.100V. This 78mV gap enables µPs to execute critical save routines before reset occurs - a behavior explicitly documented in the Low-Line Output section.