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Details, datasheet, quote on part number:TPS3307
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Datasheet text preview:
TPS3307-18, TPS3307-25, TPS3307-33 TRIPLE PROCESSOR SUPERVISORS
SLVS199 DECEMBER 1998
D D D D D D D D
Triple Supervisory Circuits for DSP and Processor-Based Systems Power-On Reset Generator with Fixed Delay Time of 200 ms, No External Capacitor Needed Temperature-Compensated Voltage Reference Maximum Supply Current of 40 µA Supply Voltage Range . . . 2 V to 6 V Defined RESET Output from VDD 1.1 V MSOP-8 and SO-8 Packages Temperature Range . . . 40°C to 85°C
D OR DGN PACKAGE (TOP VIEW)
SENSE1 SENSE2 SENSE3 GND
1 2 3 4
8 7 6 5
VDD MR RESET RESET
typical applications
Figure 1 lists some of the typical applications for the TPS3307 family, and a schematic diagram for a processor-based system application. This application uses TI part numbers TPS330733 and MSP430C325.
2.5 V 5V 3.3 V
VDD SENSE 1 SENSE 2 470 k RESET
100 nF
VDD MSP430C325 RESET GND
· · · · · · · ·
Applications using DSPs, Microcontrollers or Microprocessors Industrial Equipment Programmable Controls Automotive Systems Portable/Battery Powered Equipment Intelligent Instruments Wireless Communication Systems Notebook/Desktop Computers
TPS330733 SENSE 3
620 k
GND
Figure 1. Applications Using the TPS3307 Family
description
The TPS3307 family is a series of micropower supply voltage supervisors designed for circuit initialization primarily in DSP and processor-based systems, which require more than one supply voltage. The product spectrum of the TPS3307-xx is designed for monitoring three independent supply voltages: 3.3 V/1.8 V/adj, 3.3 V/2.5 V/adj or 3.3 V/5 V/adj. The adjustable SENSE input allows the monitoring of any supply voltage >1.25 V. The various supply voltage supervisors are designed to monitor the nominal supply voltage as shown in the following supply voltage monitoring table.
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.
Copyright © 1998, Texas Instruments Incorporated
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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· DALLAS, TEXAS 75265
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TPS3307-18, TPS3307-25, TPS3307-33 TRIPLE PROCESSOR SUPERVISORS
SLVS199 DECEMBER 1998
description (continued)
SUPPLY VOLTAGE MONITORING DEVICE TPS3307-18 TPS3307-25 NOMINAL SUPERVISED VOLTAGE SENSE1 3.3 V 3.3 V SENSE2 1.8 V 2.5 V SENSE3 User defined User defined THRESHOLD VOLTAGE (TYP) SENSE1 2.93 V 2.93 V SENSE2 1.68 V 2.25 V SENSE3 1.25 V 1.25 V 1.25 V
TPS3307-33 5V 3.3 V User defined 4.55 V 2.93 V The actual sense voltage has to be adjusted by an external resistor divider according to the application requirements.
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors the SENSEn inputs and keeps RESET active as long as SENSEn remain below the threshold voltage VIT+. An internal timer delays the return of the RESET output to the inactive state (high) to ensure proper system reset. The delay time, td typ = 200 ms, starts after all SENSEn inputs have risen above the threshold voltage VIT+. When the voltage at any SENSE input drops below the threshold voltage VIT, the RESET output becomes active (low) again. The TPS3307-xx family of devices incorporates a manual reset input, MR. A low level at MR causes RESET to become active. In addition to the active-low RESET output, the TPS3307-xx family includes an active-high RESET output. The devices are available in either 8-pin MSOP or standard 8-pin SO packages. The TPS3307-xx devices are characterized for operation over a temperature range of 40°C to 85°C.
AVAILABLE OPTIONS PACKAGED DEVICES TA SMALL OUTLINE (D) TPS3307-18D 40_C to 85_C TPS3307-25D TPS3307-33D PowerPADTM µ-SMALL OUTLINE (DGN) TPS3307-18DGN TPS3307-25DGN TPS3307-33DGN FUNCTION/TRUTH TABLES MR L H H H H H H H H X = Don't care SENSE1>VIT1 X 0 0 0 0 1 1 1 1 SENSE2>VIT2 X 0 0 1 1 0 0 1 1 SENSE3>VIT3 X 0 1 0 1 0 1 0 1 RESET L L L L L L L L H RESET H H H H H H H H L MARKING DGN PACKAGE TIAAP TIAAQ TIAAR CHIP FORM (Y) TPS3307-18Y TPS3307-25Y TPS3307-33Y
PowerPAD is a trademark of Texas Instruments Incorporated.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS3307-18, TPS3307-25, TPS3307-33 TRIPLE PROCESSOR SUPERVISORS
SLVS199 DECEMBER 1998
functional block diagram
VDD 14 k MR R1 SENSE 1 R2 R3 SENSE 2 R4 GND Reference Voltage of 1.25 V SENSE 3 + _ + _ RESET Logic + Timer RESET RESET TPS3307
_ + Oscillator
timing diagram
SENSEn V(nom) VIT
t MR 1
0 RESET 1
t
0 td td td RESET Because of SENSE Below VIT RESET Because of MR RESET Because of SENSE Below VIT RESET Because of SENSE Below VIT
t
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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