TPS3705

• Power-on reset generator with fixed delay time of 200 ms (no external capacitor needed)
• Precision supply voltage monitor: 2.5 V, 3 V, 3.3 V, and 5 V
• Pin-for-pin compatible with the MAX705 through MAX708 Series
• Integrated watchdog time (TPS3705-xx Only)
• Voltage monitor for power-fail or low-battery warning
• Maximum supply current of 50 µA
• 8-Pin MSOP and 8-Pin SOIC packages
• Temperature range: –40°C to 85°C (–40°C to 125°C for TPS3705-33)

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The TPS370x-xx family of microprocessor supply-voltage supervisors provide 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 1.1 V. Thereafter, the supply voltage supervisor monitors V_DD and keeps RESET active as long as V_DD remains below the threshold voltage V_IT+. When the supply voltage drops below the threshold voltage V_IT–, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage V_IT– set by an internal voltage divider.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in either 8-pin MSOP or standard SOIC packages. The TPS370x-xx devices are characterized for operation over a temperature range of −40°C to 85°C.