TPS3836 Datasheet, PDF (1/16 Pages) Texas Instruments – NanoPower Supervisory Circuits

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TPS3836
TPS3837
TPS3838
SLVS292E – JUNE 2000 – REVISED OCTOBER 2010
NanoPower Supervisory Circuits
Check for Samples: TPS3836, TPS3837, TPS3838
FEATURES
1
•23 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™
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TPS3838DRV
2mm x 2mm SON-6
(TOP VIEW)
V_DD 1
6 CT
GND
2
GND
5
(1)
N/C
RESET 3
4 MR
TPS3836, TPS3838
DBV PACKAGE
(TOP VIEW)
CT
1
5
V_DD
GND
2
TPS3837
DBV PACKAGE
(TOP VIEW)
CT
1
5
V_DD
GND
2
MR
3
4
RESET
MR
3
4
RESET
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 V_DD becomes higher than 1.1 V.
Thereafter, the supervisory circuit monitors V_DD and
keeps the RESET output active as long as V_DD
remains below the threshold voltage of V_IT. An
internal timer delays the return of the output to the
inactive state (high) to ensure proper system reset.
The delay time starts after V_DD has risen above the
threshold voltage V_IT.
When CT is connected to GND, a fixed delay time of
typical 10 ms is asserted. When connected to V_DD,
the delay time is typically 200 ms. When the supply
voltage drops below the threshold voltage V_IT, the
output becomes active (low) again. All the devices of
this family have a fixed-sense threshold voltage (V_IT)
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 2x2 SON-6 package. The TPS3836,
TPS3837, and TPS3838 families are characterized
for operation over a temperature range of –40°C to
+85°C.
TPS3836K33
V_DD
MSP430
V_CC
CT
RESET
MR
T
GND
RST
V_SS
Lithium
Battery
3.6 V
(1) N/C: Not connected.
Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MSP430 is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2010, Texas Instruments Incorporated