Analog Devices Inc./Maxim Integrated MAX16058ATA22+T

Overview

MAX16058ATA22+T from Analog Devices is an ultra-low-power microprocessor supervisory IC with open-drain RESET output, factory-trimmed 2.235V reset threshold (±2.5% over -40°C to +125°C), 125nA typical supply current at 1.8V, capacitor-adjustable reset timeout (10.5–17.0ms with 2700pF), and integrated watchdog timer with 128× extended mode. It monitors single VCC rails in battery-powered medical and portable electronics.

For engineers reviewing the MAX16058ATA22+T datasheet, MAX16058ATA22+T pinout, MAX16058ATA22+T application, or MAX16058ATA22+T equivalent, key selection criteria include its 2.235V reset threshold accuracy, open-drain output compatibility with mixed-voltage logic, watchdog disable via SWT-to-GND, and guaranteed RESET validity down to VCC = 1.1V - critical for low-voltage brownout immunity in glucose monitors and HVAC metering.

Technical Context

The MAX16058ATA22+T implements a precision bandgap-based voltage monitor with 0.5% hysteresis and a dual-ramp capacitor-timed architecture: SRT pin sets reset timeout via linear ramp current (210–240nA) and threshold (1.173–1.297V), while SWT/WDS pins configure watchdog timeout using identical ramp circuitry plus 128× multiplication logic. Its BiCMOS process enables stable operation across automotive temperature range (-40°C to +125°C).

Unlike push-pull variants (MAX16056/MAX16057), the open-drain RESET output supports level-shifting to external logic supplies up to 5.5V, with leakage-limited pullup requirements. The WDI input detects falling edges ≥150ns wide, and MR asserts reset with 250ns delay and 1µs minimum pulse width - enabling robust manual reset in noisy environments without external debounce.

Key Specifications

Pinout & Package

MAX16058ATA22+T uses an 8-pin 3mm × 3mm TDFN-EP package with exposed pad (EP) connected to GND. Pin 1 is RESET (open-drain), Pin 2 is GND, Pin 3 is SWT (watchdog timeout capacitor input), Pin 4 is MR (manual reset input), Pin 5 is SRT (reset timeout capacitor input), Pin 6 is N.C., Pin 7 is VCC (supply input), Pin 8 is WDS (watchdog select input). WDI is not present on this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16056ATA22+T, the MAX16058ATA22+T's open-drain output enables flexible logic-level interfacing but requires external pullup; versus TLV809E22DBZR, it delivers watchdog supervision and precise timing adjustability at 2.8× lower supply current - essential for long-life medical and industrial deployments.

Availability

MAX16058ATA22+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered metering, HVAC sensor nodes, and low-power wearables requiring stable component supply across automotive temperature ranges and long-term production continuity.

Supply support for MAX16058ATA22+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX16056–MAX16059 family was designed specifically for ultra-low-power supervisory functions in battery-critical applications, emphasizing nanoampere quiescent current, wide supply range, and capacitor-programmable timing - targeting glucose monitors, smart meters, and portable instrumentation.

FAQ

What is the factory-trimmed reset threshold voltage for MAX16058ATA22+T?

The MAX16058ATA22+T has a factory-trimmed reset threshold of 2.235V (typical), with tolerance of ±2.5% over the full -40°C to +125°C temperature range. This value corresponds to the "22" suffix per Table 1 in the datasheet and is laser-trimmed during production to ensure accuracy without external calibration. The MAX16058ATA22+T maintains this threshold stability across its entire operating voltage range (1.1V to 5.5V).

Does MAX16058ATA22+T include a watchdog timer, and how is it configured?

Yes, the MAX16058ATA22+T includes a capacitor-adjustable watchdog timer. It is configured using the SWT pin (capacitor to GND) and WDS pin (GND for normal mode, VCC for 128× extended mode). The base timeout ranges from 5ms to 9.5ms over temperature, extendable up to 296s. Watchdog disable is achieved by connecting SWT directly to GND. The MAX16058ATA22+T does not include the WDI pin found on other variants - its watchdog is triggered solely by SWT capacitor timing and WDS state.

What package type and footprint does MAX16058ATA22+T use?

The MAX16058ATA22+T uses an 8-pin 3mm × 3mm TDFN-EP (Thin Dual Flat No-lead with Exposed Pad) package. The exposed pad (EP) must be connected to GND for thermal and electrical performance. Land pattern number 90-0059 applies, and the outline is T833-2. This compact RoHS-compliant package supports high-density PCB layouts required in portable medical and wearable devices where the MAX16058ATA22+T is commonly deployed.

How does the open-drain RESET output of MAX16058ATA22+T differ from push-pull variants?

The open-drain RESET output of MAX16058ATA22+T requires an external pullup resistor to the target logic supply (e.g., 1.8V, 3.3V, or 5V), enabling level-shifting between different voltage domains. Unlike push-pull variants (e.g., MAX16056ATA22+T), it cannot actively drive high - only sink current when asserted. This design allows the MAX16058ATA22+T to interface safely with µPs operating at voltages higher than its own VCC, a key requirement in mixed-supply systems like HVAC sensor nodes where the MAX16058ATA22+T supervises a 2.2V rail but drives a 3.3V controller.

Can MAX16058ATA22+T operate reliably at VCC = 1.1V, and what happens to RESET at that level?

Yes, the MAX16058ATA22+T is fully specified to guarantee valid RESET assertion down to VCC = 1.1V. At this voltage, the internal comparator remains functional and will assert the open-drain RESET output low if VCC falls below the 2.235V threshold. However, the output's sink current capability degrades significantly below 1.1V, so for applications requiring RESET validity down to 0V, a pulldown resistor is not applicable here (as MAX16058ATA22+T uses open-drain, not push-pull). The MAX16058ATA22+T's guaranteed operation at 1.1V ensures fail-safe behavior during deep brownout conditions common in coin-cell-powered glucose monitors.