Texas Instruments TPS3838E18DBVR

The TPS3836, TPS3837, and TPS3838 device families of supervisory circuits provide circuitinitialization and timing supervision, primarily fordigitalsignal processors (DSP) and processor-based systems.

During power-on, RESET is asserted when the supply voltageV_DD becomes higher than 1.1 V. Thereafter, the supervisory circuit monitorsV_DD and keeps the RESET output active as long asV_DD remains below the threshold voltage of V_IT. Aninternal timer delays the return of the output to the inactive state (high) to ensure proper systemreset. The delay time starts after V_DDrises above the thresholdvoltage V_IT.

When CT is connected to GND, a fixed delay time oftypically 10 msis asserted. When connected to V_DD, the delay time is typically 200 ms. Whenthe supply voltage drops below the threshold voltage V_IT, the output becomesactive (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-pullRESET output. The TPS3837 has an active-high, push-pull RESET, and theTPS3838 integrates an active-low, open-drain RESET output. The productspectrum is designed for supply voltages of 1.8 V, 2.5 V, 3.0 V, and 3.3 V. The circuits areavailable in either a SOT23-5 or a2-mm× 2-mm SON-6 package. The TPS3836, TPS3837, and TPS3838 families are characterized for operationover a temperature range of –40°C to 85°C.