TPS3305-18, TPS3305-25, TPS3305-33

DUAL PROCESSOR SUPERVISORS

SLVS198 – DECEMBER 1998

2

POST OFFICE BOX 655303

description (continued)

The various supply voltage supervisors 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

TPS3305-18

3.3 V

1.8 V

2.93 V

1.68 V

TPS3305-25

3.3 V

2.5 V

2.93 V

2.25 V

TPS3305-33

5 V

3.3 V

4.55 V

2.93 V

supply voltage supervisor monitors the SENSEn inputs and keeps RESET active as long as SENSEn remains

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

becomes active (low) again.

The TPS3305-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,

Leaving WDI unconnected disables the watchdog.

The TPS3305-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 TPS3305-xx family includes an active-high

RESET output.

The TPS3305-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages.

The TPS3305-xx family is characterized for operation over a temperature range of – 40

°C to 85°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

TA

SMALL OUTLINE

(D)

PowerPAD

™

µ-SMALL OUTLINE

(DGN)

MARKING

DGN PACKAGE

CHIP FORM

(Y)

TPS3305-18D

TPS3305-18DGN

TIAAM

TPS3305-18Y

–40

_C to 85_C

TPS3305-25D

TPS3305-25DGN

TIAAN

TPS3305-25Y

TPS3305-33D

TPS3305-33DGN

TIAAO

TPS3305-33Y

PowerPAD is a trademark of Texas Instruments Incorporated.