Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor

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The MAX1253/MAX1254 are stand-alone, 10-channel (8 external, 2 internal) 12-bit system monitor ADCs with internal reference. A programmable single-ended/differential mux accepts voltage and remote-diode temperature-sensor inputs. These devices independently monitor the input channels without microprocessor interaction and generate an interrupt when any variable exceeds user-defined limits. The MAX1253/MAX1254 configure both high and low limits, as well as the number of fault cycles allowed, before generating an interrupt. These ADCs can also perform recursive data averaging for noise reduction. Programmable wait intervals between conversion sequences allow the selection of the sample rate.

At the maximum sampling rate of 94ksps (auto mode, single channel enabled), the MAX1253 consumes only 5mW (1.7mA at 3V). AutoShutdown™ reduces supply current to 190µA at 2ksps and to less than 8µA at 50sps.

Stand-alone operation, combined with ease of use in a small package (16-pin TSSOP), makes the MAX1253/ MAX1254 ideal for multichannel system-monitoring applications. Low power consumption also makes these devices a good fit for hand-held and battery-powered applications.
MAX1253, MAX1254: Typical Operating Circuit MAX1253, MAX1254: Typical Operating Circuit Enlarge+

Key Features

  • Monitor 10 Signals Without Processor Intervention
  • Eight External Channels Programmable as Temperature or Voltage Monitors
  • Intelligent Circuitry for Reliable Autonomous Measurement
    • Programmable Digital Averaging Filter
    • Programmable Fault Counter
  • Precision Measurements
    • 12-Bit Resolution
    • ±1 LSB INL, ±1 LSB DNL
    • ±0.75°C Temperature Accuracy (typ)
  • Flexible
    • Automatic Channel Scan Sequencer with
    • Programmable Intervals
    • Programmable Inputs: Single Ended/Differential,
    • Voltage/Temperature
    • Programmable Wait State
  • Internal 2.5V/4.096V Reference (MAX1253/MAX1254)
  • Remote Temperature Sensing Up to 10m (Differential Mode)
  • Single 3V or 5V Supply Operation
  • Small 16-Pin TSSOP Package


  • Remote Data Logging
  • Remote Telecom Networks
  • Server Farms
  • System Supervision

See parametric specs for Precision ADCs (< 5Msps) (437)

Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
External VREF
External VREF
Unipolar VIN
Bipolar VIN
ADCmaxnominalminmaxmaxmaxSee Notes
MAX1253 121094SARSPIBoth2.513.32.51.2570-761
$9.55 @1k
MAX1254 4.09654.0962.048

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX1253.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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