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2.5V Supervisory Circuits from Texas Instruments are Industry's First in SOT-23 Package

Well Suited to Serve Low-Power DSP Cores

DALLAS (May 11, 1998) - Two new families of microprocessor supervisory circuits from Texas Instruments (TI) (NYSE:TXN) feature the industry's first 2.5 volt supervisory circuit in a SOT-23 package. The devices combine a reset output, watchdog timer and manual reset all in an ultra small package. This coupled with low power consumption make the supervisory circuits ideal for digital signal processor (DSP) and portable battery-powered applications. Examples include laptop computers, personal digital assistants (PDAs), wireless telephones, computer games and portable test systems.

The two families, designated the TPS3823-XX and TPS3824-XX, monitor the system's power supply and processor timing. In the event of a power loss or faulty processor operation, the circuit generates a reset signal to the processor. Both product families require no external capacitors or resistors which saves both board space and system cost - crucial considerations in all portable applications.

"Besides broadening TI's portfolio of microprocessor supervisory circuits, we're introducing the industry's first 2.5V supervisor in a SOT-23 package -- providing a DSP solution for today's advanced mixed-voltage DSPs. A good example is TI's TMS320C549, which features a 2.5V processing core and 3.3V input/output (I/O) lines," said Bob Newton, Analog Products Specialist at TI. "The tiny five-pin small outline transistor (SOT23) surface mount package is one of the smallest packages available in the industry today. And these new devices consume only 25 micro-amps, which extends the battery life in portable applications."

Both the TPS3823-XX and the TPS3824-XX families are made up of four devices with different voltage ratings of 2.5V, 3.0V, 3.3V and 5.0V. The TPS3823 devices feature a manual reset capability, while the TPS3824 devices have the flexibility of generating a reset with either a high voltage or a low voltage signal, depending on the needs of the processor. During system power up, the Reset output becomes active at 1.1 V. Reset threshold voltages are accurate to 2 percent.

Pricing and Availability

The TPS3823/4 devices are fabricated using TI's advanced LinBiCMOS process. They are available now from Texas Instruments and its authorized distributors. Suggested resale pricing in quantities of 1,000 is $0.92.

More information on TI's family of power management devices can be found on the World Wide Web at http://www.ti.com/sc/power