Analog Devices Inc./Maxim Integrated MAX16057ATT23+T

Overview

MAX16057ATT23+T from Analog Devices is a nanoPower microprocessor supervisory circuit in a 6-pin TDFN package, designed to monitor single-supply VCC (1.1V–5.5V) and assert active-low RESET when voltage drops below factory-trimmed 2.313V threshold, manual reset is triggered, or watchdog timeout occurs - though MAX16057 lacks watchdog functionality. It delivers ultra-low 125nA typical supply current and supports capacitor-adjustable reset timeout (e.g., 14.18ms with 2700pF), making it ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX16057ATT23+T datasheet, MAX16057ATT23+T pinout, MAX16057ATT23+T application, or MAX16057ATT23+T equivalent, key selection criteria include its 2.313V reset threshold tolerance (±2.5% over –40°C to +125°C), push-pull RESET output with guaranteed validity down to VCC = 1.1V, and absence of watchdog timer - distinguishing it from MAX16056/MAX16058 variants.

Technical Context

The MAX16057ATT23+T implements a precision bandgap-based voltage monitor with hysteresis (0.5%) to reject supply transients, and uses internal ramp-current charging of external SRT capacitor to generate programmable reset timeout. Its reset assertion is guaranteed valid for VCC ≥ 1.1V, and MR input accepts CMOS logic levels with 1µs minimum pulse width and 200ns glitch rejection.

No watchdog circuitry is integrated - unlike MAX16056/MAX16058 - eliminating WDI, SWT, and WDS pins. The device features a push-pull RESET output capable of sinking 50µA at 0.3V (VCC ≥ 1.0V) and sourcing 200µA at 0.8×VCC (VCC ≥ 1.8V), with no internal pull-up on MR requiring external bias if unused.

Key Specifications

Pinout & Package

MAX16057ATT23+T is housed in a 3mm × 3mm, 6-pin TDFN-EP package with exposed pad (EP) recommended to be connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16057ATT22+T and MAX16057ATT26+T, the MAX16057ATT23+T provides optimal reset timing for 2.3V battery-powered systems - balancing early fault detection against false resets due to transient dips, while maintaining identical pinout, package, and capacitor-adjustable timeout behavior.

Availability

MAX16057ATT23+T is available at Aetrix Electronics and suitable for portable medical devices, smart utility meters, HVAC sensor nodes, and battery-powered instrumentation requiring stable component supply across automotive-grade temperature ranges.

Supply support for MAX16057ATT23+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 engineered specifically for ultra-low-power supervisory functions in battery-critical applications, emphasizing nanoampere quiescent current, factory-trimmed accuracy, and capacitor-programmable timing - not general-purpose reset ICs.

FAQ

What is the exact reset threshold voltage of MAX16057ATT23+T and how does it vary with temperature?

The MAX16057ATT23+T has a factory-trimmed reset threshold of 2.313V (typical) at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +125°C range. This value is derived from Table 1's "23" suffix and confirmed in the Electrical Characteristics table. Hysteresis is 0.5%, ensuring clean release above the threshold. The MAX16057ATT23+T maintains this specification without requiring external calibration.

Does MAX16057ATT23+T include a watchdog timer, and how does it differ from MAX16056 variants?

No, the MAX16057ATT23+T does not include a watchdog timer - this is explicitly stated in the General Description and Pin Description sections. Unlike MAX16056/MAX16058, it omits WDI, SWT, and WDS pins. The MAX16057ATT23+T is functionally identical to MAX16056 except for the absence of watchdog circuitry, making it suitable for simpler supervision tasks where software-level watchdogs are handled externally. This distinction is critical when selecting between MAX16057ATT23+T and other members of the family.

What capacitor value is required to achieve a 14.18ms reset timeout with MAX16057ATT23+T?

A 2700pF capacitor connected between the SRT pin and GND yields a nominal reset timeout of 14.18ms for the MAX16057ATT23+T, as directly listed in Table 2. This relationship follows tRP = 5.15 × 10⁶ × CSRT (seconds), so CSRT = tRP / 5.15 × 10⁶. For 14.18ms, calculation confirms 0.01418 / 5.15 × 10⁶ ≈ 2750pF - closely matching the 2700pF entry. Use X7R ceramic capacitors with leakage <10nA for stability.

Can MAX16057ATT23+T operate reliably at VCC = 1.2V, and what is the minimum valid supply voltage?

Yes, the MAX16057ATT23+T operates reliably down to VCC = 1.1V, as guaranteed in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.2V, all specifications including 125nA supply current, 2.313V threshold detection, and push-pull RESET output remain valid. Below 1.1V, RESET assertion is not guaranteed - the MAX16057ATT23+T is designed to provide deterministic reset behavior precisely within the 1.1V–5.5V operating window.

Is the exposed pad (EP) on MAX16057ATT23+T electrically connected, and how should it be handled on the PCB?

The exposed pad (EP) on the MAX16057ATT23+T is not electrically connected to any internal node - it serves solely as a thermal and mechanical interface. Per the Pin Description and Package Information, EP should be soldered to the PCB ground plane to achieve the specified θJA of 42°C/W and improve long-term reliability. Leaving it unconnected degrades thermal performance but does not affect electrical functionality. Do not route signals under or connect EP to voltage rails.