TPS3838-Q1 Nanopower Supervisory Circuits for Automotive | TI.com

TPS3838-Q1 (ACTIVE) Nanopower Supervisory Circuits for Automotive

Nanopower Supervisory Circuits for Automotive - TPS3838-Q1
Datasheet
 

Description

The TPS3836, TPS3837, 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 RESET output 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 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 active-high push-pull RESET, and 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 V, and 3.3 V. The circuits are available in a 5-pin SOT-23 package. The TPS3836-Q-Q1, TPS3837-Q-Q1, TPS3838-Q-Q1 families are characterized for operation over a temperature range of –40°C to 125°C.

Features

  • Qualified for Automotive Applications
  • Customer-Specific Configuration Control Can Be Supported Along With Major-Change Approval
  • ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
  • Supply Current of 220 nA (Typ)
  • Precision Supply Voltage Supervision Range: 1.8 V, 2.5 V, 3.0 V, 3.3 V
  • Power-On Reset Generator With Selectable Delay Time of 10 ms or 200 ms
  • Push/Pull RESET Output (TPS3836), RESET Output (TPS3837), or Open-Drain RESET Output (TPS3838)
  • Manual Reset
  • 5-Pin SOT-23 Package
  • Temperature Range –40°C to 125°C
  • Applications Include
    • Applications Using Automotive Low-Power DSPs, Microcontrollers, or Microprocessors
    • Battery-Powered Equipment
    • Intelligent Instruments
    • Wireless Communication Systems
    • Automotive Systems

Parametrics

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Part number Order Threshold voltage 1 (Typ) (V) Number 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-Q1 Order now 1.71
2.25
2.64
2.93    
1     6     1.6     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     None    
TPS3808-Q1 Order now Adjustable
1.12
1.16
1.4
1.67
2.79
3.07
4.65    
1     6.5     1.8     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     None    
TPS3836 Order now 1.71
2.25
2.64
2.79
2.93    
1     6     1.6     Active-low
Push-pull    
Programmable     Active-low enable
Manual reset    
Catalog     -40 to 85     None    
TPS3836-Q1 Order now 2.25
2.64
2.93    
1     6     1.6     Active-low
Push-pull    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     None    
TPS3838 Order now 1.71
2.25
2.64
2.93    
1     6     1.6     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Catalog     -40 to 85     None    
TPS3840-Q1 Order now Trimmable
1.6
2.5
2.7
2.9
4.2    
1     10     1.5     Active-high
Active-low
Open-drain
Push-pull    
Programmable     Manual reset     Automotive     -40 to 125     None    
TPS3890-Q1 Order now Adjustable
1.15
1.44
1.73
2.4
2.89
2.93
3.066
3.17
4.4
4.65
4.8    
1     5.5     1.5     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
Automotive     -40 to 125     None