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

D

Power-On Reset Generator With Fixed
Delay Time of 200 ms (TPS3823/4/5/8)

TPS3820, TPS3823, TPS3828 . . . DBV PACKAGE

(TOP VIEW)

RESET

1

V

5

DD

or 25 ms (TPS3820)

D

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

D

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

D

Supply Voltage Supervision Range

GND

MR

2

3

4

WDI

TPS3824 . . . DBV PACKAGE

(TOP VIEW)

2.5 V, 3 V, 3.3 V, 5 V

D

Watchdog Timer (TPS3820/3/4/8)

D

Supply Current of 15 µA (Typ)

D

SOT23-5 Package

D

T emperature Range ...–40°C to 85°C

applications

D

Applications Using DSPs, Microcontrollers,
or Microprocessors

D

Industrial Equipment

D

Programmable Controls

D

Automotive Systems

D

Portable/Battery-Powered Equipment

D

Intelligent Instruments

D

Wireless Communications Systems

D

Notebook/Desktop Computeres

description

The TPS382x family of supervisors provides
circuit initialization and timing supervision,
primarily for DSP and processor-based systems.

RESET

GND

RESET

TPS3825 . . . DBV PACKAGE

RESET

GND

RESET

typical application

V

DD

RESET

TPS3823-33

MR WDI

1

2

3

(TOP VIEW)

1

2

3

100 nF

V

5

4

5

4

DD

WDI

V

DD

MR

RESET

MSP430C325

I/O

During power-on, RESET is asserted when
supply voltage VDD becomes higher than 1.1 V.

GND

Thereafter, the supply voltage supervisor moni­tors V
remains below the threshold voltage V

and keeps RESET active as long as V

DD

DD

IT–

.
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 V
the threshold voltage V

, the output becomes active (low) again. No external components are required. All

IT–

the devices of this family have a fixed-sense threshold voltage V

. When the supply voltage drops below

IT–

set by an internal voltage divider.

IT–

3.3 V

V

DD

GND

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

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, t
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

TPS3820-25DBVT†TPS3820-25DBVR
TPS3820-30DBVT†TPS3820-30DBVR
TPS3820-33DBVT†TPS3820-33DBVR
TPS3820-50DBVT†TPS3820-50DBVR
TPS3823-25DBVT†TPS3823-25DBVR
TPS3823-30DBVT†TPS3823-30DBVR
TPS3823-33DBVT†TPS3823-33DBVR
TPS3823-50DBVT†TPS3823-50DBVR
TPS3824-25DBVT†TPS3824-25DBVR
TPS3824-30DBVT†TPS3824-30DBVR
TPS3824-33DBVT†TPS3824-33DBVR
TPS3824-50DBVT†TPS3824-50DBVR

TPS3825-25DBVT†TPS3825-25DBVR
TPS3825-30DBVT†TPS3825-30DBVR
TPS3825-33DBVT†TPS3825-33DBVR
TPS3825-50DBVT†TPS3825-50DBVR
TPS3828-25DBVT†TPS3828-25DBVR
TPS3828-30DBVT†TPS3828-30DBVR
TPS3828-33DBVT†TPS3828-33DBVR
TPS3828-50DBVT†TPS3828-50DBVR

†

The DBVT package indicates tape and reel of 250 parts.

‡

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

DEVICE NAME THRESHOLD VOLTAGE MARKING

FUNCTION/TRUTH TABLE

, RESET becomes active for the time period td. This event

tout

‡§
‡§

‡
‡
‡
‡
‡
‡
‡
‡
‡
‡

‡§
‡§

‡

‡
‡§
‡§

‡

‡

2.25 V

2.63 V

2.93 V PDEI

4.55 V PDDI

2.25 V PAPI

2.63 V PAQI

2.93 V PARI

4.55 V PASI

2.25 V PATI

2.63 V PAUI

2.93 V PAVI

4.55 V PAWI

2.25 V

2.63 V

2.93 V PDGI

4.55 V PDFI

2.25 V

2.63 V

2.93 V PDII

4.55 V PDHI

INPUTS

‡

MR

L 0 L H

L 1 L H
H 0 L H
H 1 H L

†

TPS3824/5

‡

TPS3820/3/5/8

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

VDD>V

IT

OUTPUTS

RESET RESET

†

functional block diagram

V

DD

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

PROCESSOR SUPERVISORY CIRCUITS

SLVS165C – APRIL 1998 – REVISED DECEMBER 1999

†

52 kΩ

Reset

Reset

MR

‡

Watchdog

Timer Logic

+
_

V

ref

40 kΩ

Reset
Logic

timing diagram

V

IT

V

DD

1.1 V

RESET

WDI

X = Don’t care

Transition

Detector

†

TPS3824/5

‡

TPS3820/3/5/8

t

d

undefined

XX XX

t

d

t

t(out)

WDI

t

d

undefined

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3