Analog Devices Inc./Maxim Integrated MAX1253BEUE+T

Overview

The MAX1253BEUE+T from Maxim Integrated is a stand-alone, 10-channel (8 external + 2 internal) 12-bit system monitor ADC with integrated 2.5V reference, ±1 LSB INL/DNL accuracy, and autonomous fault detection logic. It independently monitors voltage and remote-diode temperature inputs without microprocessor intervention and triggers an interrupt upon threshold violation-used in telecom power supervision and server board health monitoring.

For engineers reviewing the MAX1253BEUE+T datasheet, MAX1253BEUE+T pinout, MAX1253BEUE+T application, or MAX1253BEUE+T equivalent, this page delivers verified electrical specs, confirmed TSSOP-16 pin mapping, real-world thermal/voltage monitoring use cases, and two validated alternative parts for multichannel embedded system design.

Technical Context

The MAX1253BEUE+T implements a fully differential SAR ADC with on-chip track-and-hold, supporting both single-ended and differential input configurations across AIN0–AIN7. Its autonomous alarm engine compares each channel's 12-bit result against programmable upper/lower thresholds and fault-cycle counters before asserting the INT output.

It integrates dual internal monitoring channels: VDD/2 supply rail and on-die temperature sensor (±3.0°C error over –40°C to +85°C), while enabling remote diode sensing up to 10m in differential mode. Conversion timing is configurable: 10.6µs for voltage, 46µs for temperature, with sample intervals programmable down to zero wait state.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (4.4mm × 5.0mm, 0.65mm pitch), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar system-monitoring applications.

Compared with MAX1253AEUE+T, the MAX1253BEUE+T trades ±2°C internal sensor accuracy for lower cost and same power/performance envelope; versus ADS7953IRHBT, it delivers self-contained monitoring capability at the expense of 6 fewer analog inputs-making it optimal for compact, autonomous health-check subsystems.

Availability

MAX1253BEUE+T is available at Aetrix Electronics and suitable for telecom power shelves, server board health management, and battery-powered environmental sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for MAX1253BEUE+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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on integration, low power, and reliability.

The MAX1253/MAX1254 product line targets autonomous system-level monitoring-replacing discrete ADCs, references, comparators, and µC polling loops with a single TSSOP device for embedded power and thermal supervision.

FAQ

What is the operating temperature range for the MAX1253BEUE+T?

The MAX1253BEUE+T is specified for operation from –40°C to +85°C ambient temperature. Its internal temperature sensor provides ±3.0°C accuracy across this full range, and all DC and dynamic specifications-including INL, DNL, and conversion time-are guaranteed over this interval. The device uses a silicon bandgap sensor and factory-trimmed calibration coefficients stored in on-chip registers to maintain accuracy without external compensation.

Does the MAX1253BEUE+T require an external reference voltage?

No, the MAX1253BEUE+T includes a factory-trimmed 2.5V internal reference with ±30ppm/°C drift and 160µVRMS noise, eliminating the need for external reference components. The REF pin must be left open when using the internal reference; connecting an external source disables the internal reference and requires proper bypassing per the datasheet. This integrated reference reduces BOM count and improves layout robustness in space-constrained designs.

How does the MAX1253BEUE+T handle remote temperature sensing?

The MAX1253BEUE+T supports remote diode temperature sensing using differential AIN pairs (e.g., AIN0/AIN1) to bias and measure external PNP transistors like the MMBT3904. It supplies programmable bias current (4–66µA) and performs ratiometric delta-V_BE measurements, achieving ±5°C accuracy over 10m cable runs. The device compensates for series resistance and self-heating effects in firmware-accessible registers, and its differential architecture rejects common-mode noise from long traces.

Can the MAX1253BEUE+T monitor its own supply voltage?

Yes, the MAX1253BEUE+T includes a dedicated internal VDD/2 monitor channel that continuously measures half the supply voltage (VDD/2) with ±2.5% accuracy. This allows direct detection of brown-out conditions without external resistor dividers. The measured value is stored in the current data register alongside external channel readings and can be compared against user-defined thresholds to trigger the INT output-enabling autonomous power-rail supervision in unattended systems.

What SPI interface modes does the MAX1253BEUE+T support?

The MAX1253BEUE+T uses a standard 4-wire SPI interface (CS, SCLK, DIN, DOUT) with fixed CPOL = 0 and CPHA = 0 timing-data sampled on SCLK rising edge, output valid on falling edge. It supports read/write access to all configuration, threshold, and data registers at clock rates up to 10MHz. The interface resets automatically when CS goes high, and DOUT enters high-impedance state-allowing multiple devices on a shared bus with individual chip select lines.