Document
TPS3123J12, TPS3123G15, TPS3123J18, TPS3124J12, TPS3124G15
TPS3124J18, TPS3125J12, TPS3125G15, TPS3125J18, TPS3125L30
ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS
SLVS227 – AUGUST 1999
features
D Minimum Supply Voltage of 0.75 V D Supply Voltage Supervision Range:
– 1.2 V, 1.5 V, 1.8 V (TPS3123, TPS3124,
TPS3125)
– 3 V (TPS3125 Devices only)
D Power-On Reset Generator With Fixed
Delay Time of 180 ms
D Manual Reset Input (TPS3123 and TPS3125) D Watchdog Timer Retriggers the RESET
Output at VDD ≥ VIT
D Supply Current of 14 µA (Typ) D SOT23–5 Package D Temperature Range . . . – 40°C to 85°C
typical applications
D Applications Using Low Voltage DSPs,
Microcontrollers or Microprocessors
D Wireless Communication Systems D Portable/Battery-Powered Equipment D Programmable Controls D Intelligent Instruments D Industrial Equipment D Notebook/Desktop Computers D Automotive Systems
DBV PACKAGE (TOP VIEW)
2.5 V
1.2 V
RESET GND
15 TPS3123 2
VDD
VDD MR TPS3125J12
GND RESET
CVDD DVDD TMS320UVC5402
MR RESET
GND RESET
34
15 TPS3124 2
34
WDI VDD
WDI
MR WDI VDD RESET
TPS3823-25 GND
XF
RESET GND
RESET GND
RESET
15 TPS3125 2
34
VDD 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
Copyright © 1999, Texas Instruments Incorporated 1
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 TPS3123J12DBVR† TPS3123J12DBVT‡
TPS3123G15DBVR† TPS3123G15DBVT‡
TPS3123J18DBVR† TPS3123J18DBVT‡
TPS3124J12DBVR† TPS3124J12DBVT‡
TPS3124G15DBVR† – 40°C to 85_C TPS3124J18DBVR†
TPS3124G15DBVT‡ TPS3124J18DBVT‡
TPS3125J12DBVR† TPS3125J12DBVT‡
TPS3125G15DBVR† TPS3125G15DBVT‡
TPS3125J18DBVR† TPS3125J18DBVT‡
TPS3125L30DBVR† TPS3125L30DBVT‡
† The DBVR passive indicates tape and reel of 3000 parts. ‡ The DBVT passive indicates tape and reel of 250 parts.
THRESHOLD VOLTAGE 1.08 V 1.40 V 1.62 V 1.08 V 1.40 V 1.62 V 1.08 V 1.40 V 1.62 V 2.64 V
MARKING PBNI PBOI PBPI PBQI PBRI PBSI PBTI PBUI PBVI PBXI
•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 R
Reel Package Nominal Supply Voltage Typical Reset Threshold Voltage Functionality Family
DEVICE NAME
TPS312xx12DBV TPS312xx15DBV TPS312xx18DBV TPS312xx30DBV
NOMINAL SUPPLY VOLTAGE, VNOM
1.2 V 1.5 V 1.8 V 3.0 V
DEVICE NAME
TPS312xAxxDBV TPS312xBxxDBV TPS312xCxxDBV TPS312xDxxDBV TPS312xExxDBV TPS312xFxxDBV TPS312xGxxDBV TP.