TPS3820-Q1 Automotive voltage supervisor (reset IC) with watchdog and manual reset | TI.com

TPS3820-Q1 (ACTIVE) Automotive voltage supervisor (reset IC) with watchdog and manual reset

 

Recommended alternative parts

  • TPS3820  -  Catalog version of this device
  • TPS3850-Q1  -  Automotive window detector with built-in window watchdog timer for overvoltage and undervoltage detection
  • TPS3851-Q1  -  Automotive voltage supervisor with standard watchdog timer that offers high accuracy (0.8%) and low IQ (10 µA)
  • TPS3431-Q1  -  Automotive standalone watchdog timer with no built-in voltage monitoring feature

Special note

For all new designs, use the TPS3820-33QPDBVRQ1 and TPS3820-50QPDBVRQ1 on the order now tab. TPS3820-xxQP is functionally equivalent and a replacement to the TPS3820xxQ.

Description

The TPS382x-xx-Q1 family of supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power on, RESET asserts when the supply voltage VDD becomes greater than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active low 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, td, 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&ndash, set by an internal voltage divider. The TPS382x-xx-Q1 family also offers watchdog time out options of 200 ms (TPS3820-xx-Q1) and 1.6 s (TPS3823/4/8-xx-Q1).

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • ESD Protection Exceeds 2000 V Per MIL-STD-
    883, Method 3015; Using Human Body Model
    (C = 100 pF, R = 1500 Ω)
  • Power-On Reset Generator With Fixed Delay
    Time of 200 ms (TPS3823/4/5/8-xx-Q1) or 25 ms
    (TPS3820-xx-Q1)
  • Manual Reset Input (TPS3820/3/5/8-xx-Q1)
  • Reset Output Available in Active-Low
    (TPS3820/3/4/5-xx-Q1), Active-High (TPS3824/5-
    xx-Q1), and Open Drain (TPS3828-xx-Q1)
  • Supply Voltage Supervision Range:
    2.5 V, 3 V, 3.3 V, 5 V
  • Watchdog Timer (TPS3820/3/4/8-xx-Q1)
  • Supply Current of 15 µA (Typical)
  • 5-Pin SOT-23 Package
  • Temperature Range: –40°C to 125°C

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)
TPS3820-Q1 Order now 2.93
4.55    
1     5.5     1.1     Active-low
Push-pull    
25     Active-low enable
Manual reset
Watchdog timer
Functional safety    
Automotive     -40 to 125     0.2    
TPS3823-Q1 Order now 2.25
2.63
2.93
4.55    
1     5.5     1.1     Active-low
Push-pull    
200     Active-low enable
Manual reset
Watchdog timer
Functional safety    
Automotive     -40 to 125     1.6    
TPS3824-Q1 Samples not available 2.25
2.63
2.93
4.55    
1     5.5     1.1     Active-high
Active-low
Push-pull    
200     Watchdog timer
Dual output
Functional safety    
Automotive     -40 to 125     1.6    
TPS3828-Q1 Order now 2.93
4.55    
1     5.5     1.1     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog timer
Functional safety    
Automotive     -40 to 125     1.6