Analog Devices Inc./Maxim Integrated MAX16005BTE+T

Overview

MAX16005BTE+T from Maxim Integrated is a low-voltage, hex-voltage microprocessor supervisor IC in a 16-pin TSSOP package. It monitors six independent supply rails (IN1–IN6) with fixed thresholds for 3.3V, 1.8V, and adjustable thresholds down to 0.4V, provides an active-low RESET output asserting on any undervoltage or manual reset, and features an independent watchdog output (WDO) with 1.6s typical timeout. It is used in multivoltage server power sequencing and ASIC supervisory systems.

For engineers reviewing the MAX16005BTE+T datasheet, MAX16005BTE+T pinout, MAX16005BTE+T application, or MAX16005BTE+T equivalent, key selection criteria include its six-rail monitoring capability, independent WDO functionality (distinct from RESET), 140ms minimum reset timeout, internal 30µA pullups eliminating external resistors, and guaranteed operation down to VCC = 1V - critical for low-power industrial and telecom system supervision.

Technical Context

The MAX16005BTE+T implements a dual-output supervision architecture: RESET asserts when any of the six monitored voltages falls below its threshold or MR is pulled low, remaining asserted for the timeout period after recovery; WDO operates independently as a watchdog-only output, asserting low only upon WDI timeout (not on voltage faults). Its threshold tolerance (5%/10%) is selected via the TOL pin, and margin testing is supported by the active-low MARGIN input that deasserts all outputs.

It integrates a precision 1.235V reference (±0.035V) capable of sourcing up to 40µA, enabling local calibration or ADC reference use. The SRT pin supports capacitor-adjustable reset timeout (140ms min to >1s), while WDI requires edge transitions every 1.6s (typ) to prevent WDO assertion - with no startup delay, unlike other family members.

Key Specifications

Pinout & Package

MAX16005BTE+T is housed in a 16-pin TSSOP package (outline 21-0066, land pattern 90-0117) with exposed pad internally connected to GND for thermal management. Pin functions are validated per Maxim's official pin configuration diagram for MAX16005 TSSOP.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with MAX16005ATE+T, the MAX16005BTE+T offers identical supervision functionality in a larger but more manufacturable TSSOP package; versus TPS3808G33DBVR, it delivers six-rail monitoring, independent watchdog signaling, and a precision reference - making it irreplaceable in complex multivoltage systems requiring coordinated fault management.

Availability

MAX16005BTE+T is available at Aetrix Electronics and suitable for server power sequencing, telecom line card supervision, and industrial PLC controller designs requiring stable component supply, extended temperature operation (-40°C to +125°C), and long-term lifecycle support.

Supply support for MAX16005BTE+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 demanding industrial, automotive, and communications applications.

The MAX16000–MAX16007 family was engineered specifically for multivoltage system supervision in servers, storage, and networking equipment - delivering integrated six- and eight-rail monitoring with flexible reset timing and watchdog independence.

FAQ

What is the function of the REF pin on the MAX16005BTE+T?

The REF pin on the MAX16005BTE+T provides a precision 1.235V reference output with ±0.035V accuracy over temperature and load (0–40µA). It is designed for use as a local ADC reference or calibration source in multivoltage systems. Unlike the RESET or WDO outputs, REF is a buffered voltage source - not a logic signal - and remains active regardless of supervision state. This feature is unique to the MAX16005 within the family and is explicitly documented in the Electrical Characteristics table on page 4 of the MAX16000–MAX16007 datasheet.

Does the MAX16005BTE+T support adjustable voltage thresholds for all six inputs?

Yes, the MAX16005BTE+T supports adjustable thresholds on all six inputs (IN1–IN6), with a minimum detectable voltage of 0.366V (at TOL = VCC) or 0.388V (at TOL = GND). While fixed thresholds (e.g., 3.3V, 1.8V) are preconfigured per variant (MAX16005B uses 3.3V/1.8V on IN1/IN4), the remaining inputs default to adjustable mode. Table 1 confirms MAX16005B has ADJ on IN2, IN3, IN5, and IN6 - enabling custom rail monitoring down to 0.4V, critical for modern sub-1V ASIC cores.

How does the watchdog timer behavior differ between MAX16005BTE+T and other MAX16000-series parts?

The MAX16005BTE+T watchdog timer differs critically in two ways: it drives the independent WDO pin (not RESET), and it has no 54s startup delay. When WDI is left floating or static, WDO asserts after ~1.6s - immediately, with no grace period. Other variants (e.g., MAX16004) assert RESET after 54s startup + 1.6s timeout. This makes MAX16005BTE+T ideal for applications requiring immediate watchdog response, such as real-time control loops where delayed fault detection is unacceptable.

Can the MAX16005BTE+T operate reliably at VCC = 1.2V?

Yes, the MAX16005BTE+T is fully specified to operate at VCC = 1.2V, with all outputs guaranteed to maintain correct logic states and thresholds tracking within specification. The datasheet explicitly states "guaranteed correct logic state down to VCC = 1V" (Note 2, page 4), and electrical characteristics (e.g., VOL = 0.30V at VCC = 1.2V, ISINK = 50µA) are provided at this voltage. This enables use in ultra-low-power systems, such as battery-backed SRAM supervisors or energy-harvesting nodes, where supply headroom is minimal.

What is the purpose of the MARGIN pin on the MAX16005BTE+T?

The MARGIN pin on the MAX16005BTE+T is an active-low input that forces all six OUTx outputs and RESET into a high-impedance (deasserted) state when pulled low - overriding all voltage-monitoring conditions. This enables controlled margin testing during manufacturing, where supply rails are intentionally stressed beyond nominal values to validate system robustness. Unlike MR (manual reset), MARGIN does not trigger RESET assertion; it simply disables fault signaling, allowing test equipment to sweep voltages without inducing spurious reboots or latch-ups.