Texas Instruments TPS3828-33DBVT, TPS3828-33DBVR, TPS3825-50DBVT, TPS3825-50DBVR, TPS3825-33DBVR Datasheet

TPS3820-xx, TPS3823-xx, TPS3824-xx, TPS3825-xx, TPS3828-xx

PROCESSOR SUPERVISORY CIRCUITS

SLVS165C ± APRIL 1998 ± REVISED DECEMBER 1999

features

DPower-On Reset Generator With Fixed Delay Time of 200 ms (TPS3823/4/5/8) or 25 ms (TPS3820)

DManual Reset Input (TPS3820/3/5/8)

DReset Output Available in Active-Low (TPS3820/3/4/5), Active-High (TPS3824) and Open-Drain (TPS3828)

DSupply Voltage Supervision Range

2.5V, 3 V, 3.3 V, 5 V

DWatchdog Timer (TPS3820/3/4/8)

DSupply Current of 15 A (Typ)

DSOT23-5 Package

DTemperature Range . . . ±40°C to 85°C

TPS3820, TPS3823, TPS3828 . . . DBV PACKAGE

				(TOP VIEW)
				1	5		VDD
RESET
GND				2
				3	4		WDI
	MR

TPS3824 . . . DBV PACKAGE

(TOP VIEW)

			1	5		VDD
RESET
GND			2
RESET			3	4		WDI

applications

TPS3825 . . . DBV PACKAGE

(TOP VIEW)

DApplications Using DSPs, Microcontrollers, or Microprocessors

DIndustrial Equipment

DProgrammable Controls

DAutomotive Systems

DPortable/Battery-Powered Equipment

DIntelligent Instruments

DWireless Communications Systems

DNotebook/Desktop Computeres

			1	5			VDD
RESET
GND			2
			3	4
RESET							MR

typical application

3.3 V

description

VDD

100 nF

VDD

The TPS382x family of supervisors provides

RESET

RESET

circuit initialization and timing supervision,

TPS3823-33

MSP430C325

primarily for DSP and processor-based systems.

MR

WDI

I/O

During power-on,

is asserted when

RESET

GND

GND

supply voltage VDD becomes higher than 1.1 V.

Thereafter, the supply voltage supervisor moni-

tors VDD and keeps RESET active as long as VDD remains below the threshold voltage VIT±.

An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td, starts after VDD has risen above the threshold voltage VIT±. When the supply voltage drops below the threshold voltage VIT±, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage VIT± set by an internal voltage divider.

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 1999, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

TPS3820-xx, TPS3823-xx, TPS3824-xx, TPS3825-xx, TPS3828-xx

PROCESSOR SUPERVISORY CIRCUITS

SLVS165C ± APRIL 1998 ± REVISED DECEMBER 1999

description (continued)

The TPS3820/3/5/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger

the watchdog circuit within the time-out interval, ttout, RESET becomes active for the time period td. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 5-pin SOT23-5 package. The TPS382x devices are characterized for operation over a temperature range of -40°C to 85°C.

PACKAGE INFORMATION

DEVICE NAME	DEVICE NAME	THRESHOLD VOLTAGE	MARKING
TPS3820-25DBVT²	TPS3820-25DBVR³§	2.25 V
TPS3820-30DBVT²	TPS3820-30DBVR³§	2.63 V
TPS3820-33DBVT²	TPS3820-33DBVR³	2.93 V	PDEI
TPS3820-50DBVT²	TPS3820-50DBVR³	4.55 V	PDDI
TPS3823-25DBVT²	TPS3823-25DBVR³	2.25 V	PAPI
TPS3823-30DBVT²	TPS3823-30DBVR³	2.63 V	PAQI
TPS3823-33DBVT²	TPS3823-33DBVR³	2.93 V	PARI
TPS3823-50DBVT²	TPS3823-50DBVR³	4.55 V	PASI
TPS3824-25DBVT²	TPS3824-25DBVR³	2.25 V	PATI
TPS3824-30DBVT²	TPS3824-30DBVR³	2.63 V	PAUI
TPS3824-33DBVT²	TPS3824-33DBVR³	2.93 V	PAVI
TPS3824-50DBVT²	TPS3824-50DBVR³	4.55 V	PAWI
TPS3825-25DBVT²	TPS3825-25DBVR³§	2.25 V
TPS3825-30DBVT²	TPS3825-30DBVR³§	2.63 V
TPS3825-33DBVT²	TPS3825-33DBVR³	2.93 V	PDGI
TPS3825-50DBVT²	TPS3825-50DBVR³	4.55 V	PDFI
TPS3828-25DBVT²	TPS3828-25DBVR³§	2.25 V
TPS3828-30DBVT²	TPS3828-30DBVR³§	2.63 V
TPS3828-33DBVT²	TPS3828-33DBVR³	2.93 V	PDII
TPS3828-50DBVT²	TPS3828-50DBVR³	4.55 V	PDHI

² The DBVT package indicates tape and reel of 250 parts. ³ The DBVR package indicates tape and reel of 3000 parts.

§ This device is in the Product Preview stage of development. Contact the local TI sales office for availability

FUNCTION/TRUTH TABLE

			INPUTS			OUTPUTS
	MR	³		VDD>VIT		RESET		RESET²
	L			0		L		H
	L			1		L		H
	H			0		L		H
	H			1		H		L

² TPS3824/5

³ TPS3820/3/5/8

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TPS3820-xx, TPS3823-xx, TPS3824-xx, TPS3825-xx, TPS3828-xx

PROCESSOR SUPERVISORY CIRCUITS

SLVS165C ± APRIL 1998 ± REVISED DECEMBER 1999

functional block diagram

VDD

	Watchdog	Reset²
		Reset
	Timer Logic	Logic
		Reset
		52 kΩ
	+	MR³
	_
	Vref	40 kΩ
	Transition	WDI
	Detector

² TPS3824/5

³ TPS3820/3/5/8

timing diagram

VIT

VDD

1.1 V

td

td

tt(out)

td

undefined

	undefined
RESET
WDI	X	X	X	X
	X = Don't care

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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