TPS3128-XX datasheet(2/19 Pages) TI

номер детали	TPS3128-XX

подробное описание детали	ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

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производитель	TI [Texas Instruments]

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DESCRIPTION

TPS3123-xx

TPS3124-xx, TPS3125-xx

TPS3126-xx, TPS3128-xx

SLVS227D – AUGUST 1999 – REVISED DECEMBER 2006

The TPS312x family of ultralow voltage processor supervisory circuits provides circuit initialization and timing

supervision, primarily for DSP and processor-based systems.

During power-on, RESET is asserted when the supply voltage (VDD) becomes higher than 0.75 V. Thereafter,

the supply voltage supervisor monitors VDD and keeps RESET output 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 = 180 ms, 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

a high precision internal voltage divider.

The TPS3123/5/6/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become

active. The TPS3124 devices do not have the input MR, but include a high-level output RESET same as the

TPS3125 and TPS3126 devices. In addition, the TPS3123/4/8 have a watchdog timer that needs to be triggered

periodically by a positive or negative transition at WDI. When the supervising system fails to retrigger the

watchdog circuit within the time-out interval ttout= 0.8 s, RESET output becomes active for the time period (td).

This event also reinitializes the watchdog timer.

The circuits are available in a 5-pin SOT23-5 package. The TPS312x devices are characterized for operation

over a temperature range of –40

°C to +85°C.

PACKAGE INFORMATION STANDARD VERSIONS(1)

TA

DEVICE NAME

THRESHOLD VOLTAGE

MARKING

TPS3123J12DBVR(2)

TPS3123J12DBVT(3)

1.08 V

PBNI

TPS3123G15DBVR(2)

TPS3123G15DBVT(3)

1.40 V

PBOI

TPS3123J18DBVR(2)

TPS3123J18DBVT(3)

1.62 V

PBPI

TPS3124J12DBVR(2)

TPS3124J12DBVT(3)

1.08 V

PBQI

TPS3124G15DBVR(2)

TPS3124G15DBVT(3)

1.40 V

PBRI

TPS3124J18DBVR(2)

TPS3124J18DBVT(3)

1.62 V

PBSI

TPS3125J12DBVR(2)

TPS3125J12DBVT(3)

1.08 V

PBTI

TPS3125G15DBVR(2)

TPS3125G15DBVT(3)

1.40 V

PBUI

–40

°C to +85°C

TPS3125J18DBVR(2)

TPS3125J18DBVT(3)

1.62 V

PBVI

TPS3125L30DBVR(2)

TPS3125L30DBVT(3)

2.64 V

PBXI

TPS3126E12DBVR(2)

TPS3126E12DBVT(3)

1.14 V

PFOI

TPS3126E15DBVR(2)

TPS3126E15DBVT(3)

1.43 V

PFPI

TPS3126E18DBVR(2)

TPS3126E18DBVT(3)

1.71 V

PFQI

TPS3128E12DBVR(2)

TPS3128E12DBVT(3)

1.14 V

PFRI

TPS3128E15DBVR(2)

TPS3128E15DBVT(3)

1.43 V

PFSI

TPS3128E18DBVR(2)

TPS3128E18DBVT(3)

1.71 V

PFTI

(1)

Other versions available. Contact Texas Instruments for details; minimum order quantities apply.

(2)

The DBVR passive indicates tape and reel of 3000 parts.

(3)

The DBVT passive indicates tape and reel of 250 parts.

2

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