TPS3838 (ACTIVE)

NanoPower Supervisory Circuits

NanoPower Supervisory Circuits - TPS3838
Datasheet
 

Description

The TPS3836, TPS3837, and TPS3838 families of supervisory circuits 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 supervisory circuit monitors VDD and keeps the RESET output active as long as VDD remains below the threshold voltage of VIT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time starts after VDD has risen above the threshold voltage VIT.

When CT is connected to GND, a fixed delay time of typical 10 ms is asserted. When connected to VDD, the delay time is typically 200 ms. When the supply voltage drops below the threshold voltage VIT, the output becomes active (low) again. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider.

The TPS3836 has an active-low, push-pull RESET output. The TPS3837 has an active-high, push-pull RESET, and the TPS3838 integrates an active-low, open-drain RESET output. The product spectrum is designed for supply voltages of 1.8 V, 2.5 V, 3.0 V, and 3.3 V. The circuits are available in either a SOT23-5 or 2×2 SON-6 package. The TPS3836, TPS3837, and TPS3838 families are characterized for operation over a temperature range of –40°C to +85°C.

Features

  • Supply Current: 220 nA (typical)
  • Precision Supply Voltage Supervision Range: 1.8 V, 2.5 V, 3.0 V, and 3.3 V
  • Power-On Reset Generator With Selectable Delay Time: 10 ms or 200 ms
  • Push/Pull RESET Output (TPS3836), Push/Pull RESET Output (TPS3837),
    or Open-Drain RESET Output (TPS3838)
  • Manual Reset
  • SOT23-5 and 2x2 SON-6 Packages
  • Temperature Range: –40°C to +85°C
  • APPLICATIONS
    • Applications Using Low-Power DSPs, Microcontrollers, or Microprocessors
    • Portable- and Battery-Powered Equipment
    • Intelligent Instruments
    • Wireless Communication Systems
    • Notebook Computers
    • Automotive Systems
    • Applications Using the MSP430

MSP430 Is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.

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Parametrics Compare all products in Supervisor and Reset IC

 
Threshold Voltage 1 (Typ) (V)
# of Supplies Monitored
VCC (Max) (V)
VCC (Min) (V)
Output Driver Type / Reset Output
Time Delay (ms)
Features
Rating
Operating Temperature Range (C)
Watchdog Timer WDI (sec)
TPS3838 TPS3836 TPS3837
1.71
2.25
2.64
2.93   
1.71
2.25
2.64
2.79
2.93   
1.71
2.25
2.64
2.93   
1    1    1   
6    6    6   
1.6    1.6    1.6   
Active-low
Open-drain   
Active-low
Push-pull   
Active-high
Push-pull   
Programmable    Programmable    Programmable   
Active Low Enable
Manual Reset   
Active Low Enable
Manual Reset   
Active Low Enable
Manual Reset   
Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85   
None    None    None   

Other qualified versions of TPS3838

Version Part Number Definition
Automotive TPS3838-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects