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Details, datasheet, quote on part number:TPS3306-33DGKR
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Datasheet text preview:
TPS3306-15, TPS3306-18, TPS3306-20, TPS3306-25, TPS3306-33 DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
SLVS290 APRIL 2000
D D D D D D D D D D
Dual Supervisory Circuits With Power-Fail for DSP and Processor-Based Systems Voltage Monitor for Power-Fail or Low-Battery Warning Watchdog Timer With 0.8 Second Time-Out Power-On Reset Generator With Integrated 100 ms Delay Time Open-Drain Reset and Power-Fail Output Supply Current of 15 µA (TYP.) Supply Voltage Range . . . 2.7 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
Applications Include Multivoltage DSPs and Processors Portable Battery-Powered Equipment Embedded Control Systems Intelligent Instruments Automotive Systems
D OR DGK PACKAGE (TOP VIEW)
SENSE1 SENSE2 PFI GND
1 2 3 4
8 7 6 5
VDD WDI PFO RESET
description
The TPS3306 family is a series of supervisory circuits designed for circuit initialization which require two supply voltages, primarily in DSP and processor-based systems. The product spectrum of the TPS3306-xx is designed for monitoring two independent supply voltages of 3.3 V/1.5 V, 3.3 V/1.8 V, 3.3 V/2 V, 3.3 V/2.5 V, or 3.3 V/5 V.
TYPICAL OPERATING CIRCUIT 3.3 V 1.5 V AVDD TPS330615 SENSE1 R1 1% SENSE2 PFI R2 1% GND VDD WDI PFO RESET R3 R4 CVDD DVDD B_XF A_XF RESET VSS VSSA TMS320 VC5441
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.
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.
Copyright © 2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
TPS3306-15, TPS3306-18, TPS3306-20, TPS3306-25, TPS3306-33 DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
SLVS290 APRIL 2000
description (continued)
The various supervisory circuits are designed to monitor the nominal supply voltage, as shown in the following supply voltage monitoring table.
SUPPLY VOLTAGE MONITORING DEVICE TPS3306-15 TPS3306-18 TPS3306-20 TPS3306-25 TPS3306-33 NOMINAL SUPERVISED VOLTAGE SENSE1 3.3 V 3.3 V 3.3 V 3.3 V 5V SENSE2 1.5 V 1.8 V 2V 2.5 V 3.3 V THRESHOLD VOLTAGE (TYP) SENSE1 2.93 V 2.93 V 2.93 V 2.93 V 4.55 V SENSE2 1.4 V 1.68 V 1.85 V 2.25 V 2.93 V
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supervisory circuits monitor the SENSEn inputs and keep RESET active as long as SENSEn remains 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) = 100 ms, starts after SENSE1 and SENSE2 inputs have risen above the threshold voltage VIT. When the voltage at SENSE1 or SENSE2 input drops below the threshold voltage VIT, the output becomes active (low) again. The integrated power-fail (PFI) comparator with separate open-drain (PFO) output can be used for low-battery detection, power-fail warning, or for monitoring a power supply other than the main supply. The TPS3306-xx devices integrate a watchdog timer that is periodically triggered by a positive or negative transition of WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, tt(out) = 0.50 s, RESET becomes active for the time period td . This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. The TPS3306-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages. The TPS3306-xx family is characterized for operation over a temperature range of 40°C to 85°C.
AVAILABLE OPTIONS PACKAGED DEVICES TA SMALL OUTLINE (D) TPS3305-15D TPS3305-18D 40_C to 85_C TPS3305-20D TPS3305-25D TPS3305-33D µ-SMALL OUTLINE (DGK) TPS3306-15DGK TPS3306-18DGK TPS3306-20DGK TPS3306-25DGK TPS3306-33DGK MARKING DGK PACKAGE TIAIC TIAID TIAIE TIAIF TIAIG
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS3306-15, TPS3306-18, TPS3306-20, TPS3306-25, TPS3306-33 DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
SLVS290 APRIL 2000
description (continued)
FUNCTION/TRUTH TABLES SENSE1>VIT1 0 0 1 1 SENSE2>VIT2 0 1 0 1 FUNCTION/TRUTH TABLES PFI>VIT 01 10 PFO LH HL TYPICAL DELAY 0.5 µs 0.5 µs RESET L L L H
functional block diagram
SENSE 1 R1 + _ R2 R3 + _ RESET Logic + Timer TPS3306 VDD
SENSE 2
RESET
R4 GND Reference Voltage of 1.25 V PFI
Oscillator PFO _ +
WDI
Transition Detection 40 k
Watchdog Logic + Timer
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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