Overview
The TPS3838E18DBVR is a nano-power supervisory circuit manufactured by Texas Instruments. It is part of the TPS3836, TPS3837, and TPS3838 device families, which provide circuit initialization and timing supervision primarily for digital signal processors (DSP) and processor-based systems. This device is designed to monitor the supply voltage and generate a reset signal when the voltage falls below a predefined threshold, ensuring proper system reset.
The TPS3838E18DBVR is specifically configured with an active-low, open-drain RESET output and supports supply voltages of 1.8 V, with a threshold voltage of 1.71 V. It features a selectable reset delay time of either 10 ms or 200 ms and includes a manual reset function.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT-23 (DBV) | - |
| Pins | 5 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Current | 220 nA (typical) | nA |
| Supply Voltage | 1.8 V | V |
| Threshold Voltage (VIT) | 1.71 V | V |
| Reset Delay Time | 10 ms or 200 ms | ms |
| RESET Output Type | Active-low, open-drain | - |
| Manual Reset | Active-low logic input | - |
Key Features
- Supply current: 220 nA (typical), making it suitable for low-power applications.
- Precision supply voltage supervision range: Supports 1.8 V, 2.5 V, 3.0 V, and 3.3 V supply voltages.
- Power-on reset generator with selectable delay time: 10 ms or 200 ms, configurable via the CT pin.
- Manual reset function: Allows for manual assertion of the reset output via the MR pin.
- Active-low, open-drain RESET output: Requires a pullup resistor to function properly.
- Available in 5-pin SOT-23 and 2-mm × 2-mm, 6-pin SON packages.
- Operating temperature range: –40°C to 85°C.
Applications
- Low-power DSPs, microcontrollers, or microprocessors.
- Portable and battery-powered equipment.
- Intelligent instruments.
- Wireless communication systems.
- Notebook computers.
- Applications using the MSP430™ microcontroller.
- Automotive systems (see TPS383x-Q1 for automotive-specific versions).
Q & A
- What is the primary function of the TPS3838E18DBVR?
The primary function is to provide circuit initialization and timing supervision by monitoring the supply voltage and generating a reset signal when the voltage falls below a predefined threshold.
- What are the available supply voltage options for the TPS3838 family?
The TPS3838 family supports supply voltages of 1.8 V, 2.5 V, 3.0 V, and 3.3 V.
- How can the reset delay time be configured?
The reset delay time can be configured to either 10 ms or 200 ms by connecting the CT pin to GND or VDD, respectively.
- What type of RESET output does the TPS3838E18DBVR have?
The TPS3838E18DBVR has an active-low, open-drain RESET output.
- Does the TPS3838E18DBVR require a pullup resistor for the RESET output?
- What is the operating temperature range of the TPS3838E18DBVR?
The operating temperature range is –40°C to 85°C.
- What is the typical supply current of the TPS3838E18DBVR?
The typical supply current is 220 nA.
- What package options are available for the TPS3838E18DBVR?
The device is available in 5-pin SOT-23 and 2-mm × 2-mm, 6-pin SON packages.
- How does the manual reset function work?
The manual reset function is activated by setting the MR pin to logic low, which asserts the reset output. When MR is logic high and VDD is above the threshold voltage, the reset output deasserts after the reset delay time.
- What are some common applications for the TPS3838E18DBVR?
Common applications include low-power DSPs, microcontrollers, portable and battery-powered equipment, intelligent instruments, wireless communication systems, and notebook computers.
