TPS330615Q1, TPS330618Q1, TPS330620Q1, TPS330625Q1, TPS330633Q1

DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER FAIL

SGLS241B − MARCH 2004 − REVISED APRIL 2008

2

POST OFFICE BOX 655303

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

NOMINAL SUPERVISED VOLTAGE

THRESHOLD VOLTAGE (TYP)

DEVICE

SENSE1

SENSE2

SENSE1

SENSE2

TPS3306-15

3.3 V

1.5 V

2.93 V

1.4 V

TPS3306-18

3.3 V

1.8 V

2.93 V

1.68 V

TPS3306-20

3.3 V

2 V

2.93 V

1.85 V

TPS3306-25

3.3 V

2.5 V

2.93 V

2.25 V

TPS3306-33

5 V

3.3 V

4.55 V

2.93 V

supervisory circuits monitor the SENSEn inputs and keep RESET active as long as SENSEn remains below

An internal timer delays the return of the RESET output to the inactive state (high) to ensure proper system reset.

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 the watch-dog timer (WDI). When the supervising system fails to retrigger the watchdog circuit

reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog.

The TPS3306-xx devices are available in standard 8-pin SO packages.

The TPS3306-xxQ family is characterized for operation over a temperature range of −40

°C to 125°C.

AVAILABLE OPTIONS{

TA

PACKAGED DEVICES}

TOP-SIDE

TA

SMALL OUTLINE (D)

TOP-SIDE

MARKING

Tape and reel

TPS3306-15QDRQ1

615Q1

Tape and reel

TPS3306-18QDRQ1

618Q1

−40

_C to 125_C

Tape and reel

TPS3306-20QDRQ1

620Q1

−40 C to 125 C

Tape and reel

TPS3306-25QDRQ1

625Q1

Tape and reel

TPS3306-33QDRQ1

633Q1

† For the most current package and ordering information, see the Package Option Addendum

at the end of this document, or see the TI web site at http://www.ti.com.

‡ Package

drawings,

thermal

data,

and

symbolization

are

available

at

http://www.ti.com/packaging.