TPS3838

• Supply current: 220 nA (typical)
• Precision supply voltage supervision range:
  1.8 V, 2.5 V, 3.0 V, and 3.3 V
• Power-on reset generator with selectable delay time: 10 ms or 200 ms
• Push and pull RESET output (TPS3836),
  Push and pull RESET output (TPS3837), or open-drain RESET output (TPS3838)
• Manual reset
• 5-pin SOT23 and 2-mm × 2-mm, 6-pin SON packages
• Temperature range: –40°C to 85°C

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The TPS3836, TPS3837, and TPS3838 device families of supervisory circuits provide circuit initialization and timing supervision, primarily for digital signal processors (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 supervisory circuit monitors V_DD and keeps the RESET output active as long as V_DD remains below the threshold voltage of V_IT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time starts after V_DD rises above the threshold voltage V_IT.

When CT is connected to GND, a fixed delay time of typically 10 ms is asserted. When connected to V_DD, the delay time is typically 200 ms. When the supply voltage drops below the threshold voltage V_IT, the output becomes active (low) again. All the devices of this family have a fixed-sense threshold voltage (V_IT) set by an internal voltage divider.

The TPS3836 has an active-low, push-pull RESET output. The TPS3837 has an active-high, push-pull RESET, and the TPS3838 integrates an active-low, open-drain RESET output. The product spectrum is designed for supply voltages of 1.8 V, 2.5 V, 3.0 V, and 3.3 V. The circuits are available in either a SOT23-5 or a 2-mm × 2-mm SON-6 package. The TPS3836, TPS3837, and TPS3838 families are characterized for operation over a temperature range of –40°C to 85°C.