Texas Instruments TPS3125L30DBVT, TPS3125J18DBVT, TPS3125L30DBVR, TPS3125J18DBVR, TPS3125J12DBVT Datasheet

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TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15

TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30

ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

SLVS227 ± AUGUST 1999

features

typical applications

DMinimum Supply Voltage of 0.75 V

DSupply Voltage Supervision Range:

±1.2 V, 1.5 V, 1.8 V (TPS3123, TPS3124, TPS3125)

±3 V (TPS3125 Devices only)

DPower-On Reset Generator With Fixed Delay Time of 180 ms

DManual Reset Input (TPS3123 and TPS3125)

DWatchdog Timer Retriggers the RESET Output at VDD ≥ VIT

DApplications Using Low Voltage DSPs, Microcontrollers or Microprocessors

DWireless Communication Systems

DPortable/Battery-Powered Equipment

DProgrammable Controls

DIntelligent Instruments

DIndustrial Equipment

DNotebook/Desktop Computers

DAutomotive Systems

D Supply Current of 14 A (Typ)
D	SOT23±5 Package
D Temperature Range . . . ±40°C to 85°C
	2.5 V	1.2 V
		VDD
		MR
		TPS3125J12		CVDD	DVDD
		TPS3125J12
		GND	RESET	TMS320UVC5402
				TMS320UVC5402
		MR	WDI	XF
		VDD	RESET	RESET
		VDD			GND
		TPS3823-25			GND
		TPS3823-25
		GND

DBV PACKAGE (TOP VIEW)

		1	5	VDD
RESET		1	5
RESET		TPS3123
		TPS3123
GND		2
GND		2
		3	4	WDI
	MR	3	4	WDI


		1	5	VDD
RESET		1	5	VDD
		TPS3124
GND		2
GND		2
RESET		3	4	WDI
RESET		3	4	WDI


		1	5	VDD
RESET		1	5
RESET		TPS3125
		TPS3125
GND		2
GND		2
		3	4
RESET		3	4	MR

Figure 1. Typical Dual-Voltage DSP Application

description

The TPS3123, TPS3124, TPS3125 family of ultra-low 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, tdtyp = 180 ms starts after VDD has risen above the threshold voltage VIT.

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

TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15

TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30

ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

SLVS227 ± AUGUST 1999

description (continued)

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.

The TPS3123-xx and TPS3125-xx devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3124-xx devices do not have the input MR, but include a high-level output RESET same as the TPS3125-xx devices. In addition the TPS3123-xx and TPS3124-xx have a watchdog timer that need 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 TPS3123, TPS3124, TPS3125 devices are characterized for operation over a temperature range of ±40°C to 85°C.

PACKAGE INFORMATION STANDARD VERSIONS

TA	DEVICE NAME		THRESHOLD VOLTAGE	MARKING
	TPS3123J12DBVR²	TPS3123J12DBVT³	1.08 V	PBNI
	TPS3123G15DBVR²	TPS3123G15DBVT³	1.40 V	PBOI
	TPS3123J18DBVR²	TPS3123J18DBVT³	1.62 V	PBPI
	TPS3124J12DBVR²	TPS3124J12DBVT³	1.08 V	PBQI
±40°C to 85_C	TPS3124G15DBVR²	TPS3124G15DBVT³	1.40 V	PBRI
±40°C to 85_C	TPS3124J18DBVR²	TPS3124J18DBVT³	1.62 V	PBSI
	TPS3124J18DBVR²	TPS3124J18DBVT³	1.62 V	PBSI
	TPS3125J12DBVR²	TPS3125J12DBVT³	1.08 V	PBTI
	TPS3125G15DBVR²	TPS3125G15DBVT³	1.40 V	PBUI
	TPS3125J18DBVR²	TPS3125J18DBVT³	1.62 V	PBVI
	TPS3125L30DBVR²	TPS3125L30DBVT³	2.64 V	PBXI

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

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15

TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30

ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

SLVS227 ± AUGUST 1999

ordering information application specific versions

TPS312 3 J

12 DBV

Reel

Package

Nominal Supply Voltage

Typical Reset Threshold Voltage

Functionality

Family

NOMINAL SUPPLY

TYPICAL RESET

DEVICE NAME

THRESHOLD

VOLTAGE, VNOM

DEVICE NAME

VOLTAGE±VIT±

TPS312xx12DBV

1.2 V

TPS312xAxxDBV

VNOM±1%

TPS312xx15DBV

1.5 V

TPS312xBxxDBV

VNOM±2%

TPS312xx18DBV

1.8 V

TPS312xCxxDBV

VNOM±3%

TPS312xx30DBV

3.0 V

TPS312xDxxDBV

VNOM±4%

TPS312xExxDBV

VNOM±5%

TPS312xFxxDBV

VNOM±6%

TPS312xGxxDBV

VNOM±7%

TPS312xHxxDBV

VNOM±8%

TPS312xIxxDBV

VNOM±9%

TPS312xJxxDBV

VNOM±10%

TPS312xKxxDBV

VNOM±11%

TPS312xLxxDBV

VNOM±12%

TPS312xMxxDBV

VNOM±13%

TPS312xNxxDBV

VNOM±14%

TPS312xOxxDBV

VNOM±15%

NOTE: Ten standard versions will be available at product introduction.

For the application specific versions contact the local TI sales office for availability and lead time.

Function Tables

TPS3123

TPS3124

TPS3125

VDD > VIT

RESET

VDD > VIT

RESET

VDD > VIT

RESET

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

Texas Instruments TPS3125L30DBVT, TPS3125J18DBVT, TPS3125L30DBVR, TPS3125J18DBVR, TPS3125J12DBVT Datasheet

TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15 TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30 ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

SLVS227 ± AUGUST 1999

functional block diagram

VDD		Device Power Supply
	R1
MR²
	R2
		RESET
		Reset Logic
		+ Timer
	R3	RESET§
GND
	Reference
	Voltage
WDI³	Transition	Watch Dog
	Transition	Logic +
	Detector	Logic +
	Detector	Timer
		Timer