FEATURES DESCRIPTION 2 The TPS3809 family of supervisory circuits provides • 3-Pin SOT-23 Package circuit initialization and timing supervision, primarily • Supply Current of 9 μA (Typical) for DSPs and processor-based systems. • Precision Supply Voltage Monitor During power-on, RESET is asserted when the 2.5 V, 3 V, 3.3 V, 5 V supply voltage VDD becomes higher than 1.1 V. • Pin-For-Pin Compatible With MAX 809 Thereafter, the supervisory circuit monitors VDD and • Temperature Range: –40°C to +85°C keeps RESET active as long as VDD remains below the threshold voltage VIT. An internal timer delays the APPLICATIONS return of the output to the inactive state (high) to ensure proper system reset. The delay time, td(typ) = • Applications Using DSPs, Microcontrollers, or 200 ms, starts after VDD has risen above the Microprocessors threshold voltage VIT. When the supply voltage drops • Wireless Communication Systems below the threshold voltage VIT, the output becomes active (low) again. No external components are • Portable/Battery-Powered Equipment required. All the devices of this family have a fixed • Programmable Controls sense-threshold voltage VIT set by an internal voltage • Intelligent Instruments divider. • Industrial Equipment The product spectrum is designed for supply voltages • Notebook/Desktop Computers of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 3-pin SOT-23. The TPS3809 devices • Automotive Systems are characterized for operation over a temperature range of –40°C to 85°C

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