TPS3836E18 Datasheet, PDF (1/11 Pages) Texas Instruments – NANOPOWER SUPERVISORY CIRCUITS

TPS3836E18 / J25 / H30 / L30 / K33
TPS3837E18 / J25 / L30 / K33, TPS3838E18 / J25 / L30 / K33
NANOPOWER SUPERVISORY CIRCUITS
SLVS292A – JUNE 2000 – REVISED JANUARY 2002
D Supply Current of 220 nA (Typ)
D Precision Supply Voltage Supervision
Range: 1.8 V, 2.5 V, 3.0 V, 3.3 V
D Power-On Reset Generator With Selectable
Delay Time of 10 ms or 200 ms
D Push/Pull RESET Output (TPS3836),
RESET Output (TPS3837), or
Open-Drain RESET Output (TPS3838)
D Manual Reset
D 5-Pin SOT-23 Package
D Temperature Range –40°C to 85°C
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 V_DD becomes higher than 1.1 V.
Thereafter, the supervisory circuit monitors V_DD
and keeps RESET output active 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 starts after V_DD has risen
above the threshold voltage V_IT.
D Applications Include
– Applications Using Low-Power DSPs,
Microcontrollers, or Microprocessors
– Portable/Battery-Powered Equipment
– Intelligent Instruments
– Wireless Communication Systems
– Notebook Computers
– Automotive Systems
TPS3836, TPS3838
DBV PACKAGE
(TOP VIEW)
CT
1
5
VDD
GND
2
MR
3
4
RESET
TPS3837
DBV PACKAGE
(TOP VIEW)
CT
1
5
VDD
GND
2
MR
3
4
RESET
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 active-high push-pull RESET, and
TPS3838 integrates an active-low open-drain RESET output.
TPS3836K33
VDD
MSP430
VCC
CT
RESET
Xin
RST
Lithium
Battery
MR
Xout
Quartz
3.6 V
T
GND
VSS
32 kHz
TYPICAL OPERATING CIRCUIT
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright  2002, Texas Instruments Incorporated
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