TPS3705-50DRG4 by Texas Instruments | 处理器监控 | Avnet ASIA
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TPS3705-50DRG4

Texas Instruments

Processor Supervisor 1.25V/4.55V 2.5V/3V/3.3V/5V 8-Pin SOIC T/R

Manufacturer Part #: TPS3705-50DRG4

Alternate Part #: TPS3705-50DRG4


legend RoHS Compliant

Descriptions

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Information

The TPS3705, TPS3707 family of microprocessor supply-voltage supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems.

During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage VIT+. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, tdtyp = 200 ms, starts after VDD has risen above the threshold voltage VIT+. When the supply voltage drops below the threshold voltage VIT–, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage VIT– set by an internal voltage divider.

The TPS3705-xx and TPS3707-xx devices incorporate a manual reset input, MR\. A low level at MR\ causes RESET to become active.

The TPS370x-xx families integrate a power-fail comparator which can be used for low-battery detection, power-fail warning, or for monitoring a power supply other than the main supply.

The TPS3705-xx devices have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, tt(out) = 1.6 s, WDO\ becomes active. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog.

The TPS3707-xx devices do not have the Watchdog function, but include a high-level output RESET.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in either 8-pin MSOP or standard SOIC packages. The TPS3705, TPS3707 devices are characterized for operation over a temperature range of –40°C to 85°C.

Key Features

  • Power-On Reset Generator with Fixed Delay Time of 200 ms, no External Capacitor Needed
  • Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, and 5 V
  • Pin-For-Pin Compatible with the MAX705 through MAX708 Series
  • Integrated Watchdog Timer (TPS3705 only)
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Maximum Supply Current of 50 µA
  • MSOP-8 and SO-8 Packages
  • Temperature Range . . . –40°C to 85°C
  • Designs Using DSPs, Microcontrollers or Microprocessors
  • Industrial Equipment
  • Programmable Controls
  • Automotive Systems
  • Portable/Battery Powered Equipment
  • Intelligent Instruments
  • Wireless Communication Systems
  • Notebook/Desktop Computers
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Mounting
    Surface Mount
    Minimum Reset Threshold Voltage
    1.2|4.45 V
    Monitored Voltage
    2.5|3|3.3|5 V
    Maximum Supply Current
    50 uA
    Minimum Operating Supply Voltage
    2 V
    Battery Backup Switching
    Yes
    Operating Temperature
    -40 to 85 °C
    Max Processing Temp
    260
    Maximum Operating Supply Voltage
    6 V
    Lead Finish
    Gold
    Power Fail Detection
    Yes
    Chip Enable Signals
    No
    Number of Supervisors
    2
    Screening Level
    Industrial
    Watchdog Timer
    Yes
    Maximum Reset Threshold Voltage
    1.3|4.65 V
    Output Driver
    Active High/Active Low
    Maximum Reset Active Time
    280 ms
    Manual Reset
    Yes
    Maximum Power Dissipation
    725 mW

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    8542.39.00
    HTSN:
    8542.39.00
    UNSPSC:
    32101600
    UNSPSC VERSION:
    V15.1101

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