TPS3820-33-Q1_15 Datasheet, PDF (1/24 Pages) Texas Instruments – Voltage Monitor With Watchdog Timer

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TPS3820-33-Q1, TPS3820-50-Q1, TPS3823-25-Q1
TPS3823-30-Q1, TPS3823-33-Q1, TPS3823-50-Q1, TPS3824-30-Q1, TPS3824-33-Q1
TPS3824-50-Q1, TPS3825-33-Q1, TPS3825-50-Q1, TPS3828-33-Q1, TPS3828-50-Q1
SGLS143C – DECEMBER 2002 – REVISED DECEMBER 2015
TPS382x-xx-Q1 Voltage Monitor With Watchdog Timer
1 Features
•1 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
3 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 V_DD
becomes greater than 1.1 V. Thereafter, the supply
voltage supervisor monitors V_DD and keeps RESET
active low as long as V_DD remains below the
threshold voltage, V_IT−. An internal timer delays the
return of the output to the inactive state (high) to
ensure proper system reset. The delay time, t_d, starts
after V_DD has risen above the threshold voltage V_IT−.
When the supply voltage drops below the threshold
voltage V_IT−, the output becomes active (low) again.
No external components are required. All the devices
of this family have a fixed-sense threshold voltage,
V_IT–, 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).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS382x-xx-Q1
SOT-23 (5)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
2 Applications
• Automotive DSPs, Microcontrollers, or
Microprocessors
• Industrial Equipment
• Programmable Controls
• Automotive Systems
• Portable and Battery-Powered Equipment
• Intelligent Instruments
• Wireless Communications Systems
Typical Application Schematic
3.3 V
Normalized Input Threshold Voltage vs
Free-Air Temperature
1.001
V_DD
100 nF
V_DD
1
RESET
TPS3823-33-Q1
MR
WDI
RESET
MSP430C325
I/O
0.999
0.998
0.997
GND
GND
0.996
0.995
−40
−15
10
35
60
85
T_A − Free-Air Temperature − °C
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.