Texas Instruments TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15 TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30 User's Manual

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TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30 ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

SLVS227 – AUGUST 1999

features typical applications Minimum Supply Voltage of 0.75 V Applications Using Low Voltage DSPs,

Microcontrollers or Microprocessors

Supply Voltage Supervision Range: – 1.2 V, 1.5 V, 1.8 V (TPS3123, TPS3124, Wireless Communication Systems TPS3125)

Portable/Battery-Powered Equipment

– 3 V (TPS3125 Devices only)

Programmable Controls

Power-On Reset Generator With Fixed

Intelligent Instruments

Delay Time of 180 ms

Industrial Equipment

Manual Reset Input (TPS3123 and TPS3125)

Notebook/Desktop Computers

Watchdog Timer Retriggers the RESET

Automotive Systems

Output at VDD ≥ VIT Supply Current of 14 µA (Typ) SOT23–5 Package

DBV PACKAGE

Temperature Range –40°C to 85°C

(TOP VIEW)

RESET VDD

TPS3123

MR WDI

VDD MR

RESET VDD

CVDD DVDD

TPS3124

TPS3125J12

GND RESET

TMS320UVC5402 RESET WDI

WDI XF VDD

MR RESET

TPS3125

RESET RESET VDD

GND GND

TPS3823-25 GND MR

RESET

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.

Copyright  1999, Texas Instruments Incorporated 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.

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