TPS3123J12 Datasheet, PDF (1/13 Pages) Texas Instruments – ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS

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 V_DD ≥ V_IT
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
1
5
TPS3123
2
VDD
VDD
MR
TPS3125J12
GND _RESET
CVDD DVDD
TMS320UVC5402
MR
RESET
GND
RESET
3
4
1
5
TPS3124
2
3
4
WDI
VDD
WDI
MR
WDI
VDD ^RESET
TPS3823-25
GND
XF
RESET
GND
RESET
GND
RESET
1
5
TPS3125
2
3
4
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 (V_DD) becomes higher than 0.75 V. Thereafter,
the supply voltage supervisor monitors V_DD and keeps RESET output active as long as V_DD remains below the
threshold voltage V_IT. An internal timer delays the return of the output to the inactive state (high) to ensure proper
system reset. The delay time, t_dtyp = 180 ms starts after V_DD has risen above the threshold voltage V_IT.
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.
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Copyright © 1999, Texas Instruments Incorporated
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