Overview
The TPS3897ADRYR from Texas Instruments is a single-channel, adjustable voltage monitor designed for monitoring supply voltages greater than 500 mV. This device is part of the TPS389x family, known for its ultra-small package and high accuracy. The TPS3897ADRYR features an adjustable threshold voltage, capacitor-adjustable delay time, and a low quiescent current, making it suitable for a variety of applications requiring precise voltage monitoring.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | 1.7 | - | 6.5 | V |
| Positive-Going Input Threshold Voltage (VIT+) | 0.495 | 0.5 | 0.505 | V |
| Hysteresis Voltage (Vhys) | - | 5 | - | mV |
| Quiescent Current (ICC) | 6 | - | 12 | µA |
| CT Pin Charge Current (I(CT)) | 260 | 310 | 360 | nA |
| CT Pin Comparator Threshold Voltage (V(CT)) | 1.18 | 1.238 | 1.299 | V |
| CT Pin Pulldown Resistance (R(CT)) | 200 | - | - | Ω |
| Low-Level Input Voltage (ENABLE pin) (VIL) | 0.4 | - | - | V |
| High-Level Input Voltage (ENABLE pin) (VIH) | - | - | 1.4 | V |
| Undervoltage Lockout (UVLO) | 1.3 | - | 1.7 | V |
| Low-Level Output Voltage (VOL) | 0.3 | - | - | V |
| High-Level Output Voltage (VOH) | - | - | 0.8VCC | V |
| Open-Drain Output Leakage Current (Ilkg(OD)) | - | - | 300 | nA |
| Temperature Range | -40 | - | 125 | °C |
Key Features
- Adjustable Threshold Voltage: Down to 500 mV with a 0.25% typical threshold accuracy over temperature.
- Capacitor-Adjustable Delay Time: Allows for user-adjustable delay times using external capacitors.
- Low Quiescent Current: Typical 6 µA, making it power-efficient.
- External Enable Input: Enables or disables the output based on the ENABLE pin state.
- Open-Drain and Push-Pull Output Options: The TPS3897ADRYR features an open-drain output that can be pulled up to 18 V independent of VCC.
- Temperature Range: Operates from -40°C to 125°C.
- Pin-for-Pin Compatible: Compatible with MAX6895/6/7/8 devices.
Applications
- Voltage Monitoring: Monitors supply voltages to ensure they are above the minimum operating voltage for proper device operation.
- Voltage Sequencing: Can be used to implement voltage rail sequencing by enabling downstream voltage rails once the monitored voltage is above the threshold.
- Multiple Supply Monitoring: Multiple TPS3897ADRYR devices can be used to monitor multiple supply rails with a single output signal.
- DSP, CPU, FPGA, and ASIC Systems: Ensures proper operation of these devices by monitoring their supply voltages.
Q & A
- What is the supply voltage range for the TPS3897ADRYR?
The supply voltage range is from 1.7 V to 6.5 V.
- What is the typical quiescent current of the TPS3897ADRYR?
The typical quiescent current is 6 µA.
- How is the delay time adjusted in the TPS3897ADRYR?
The delay time is adjusted using an external capacitor connected to the CT pin.
- What are the output options for the TPS3897ADRYR?
The device features an open-drain output that can be pulled up to 18 V independent of VCC.
- What is the temperature range for the TPS3897ADRYR?
The device operates from -40°C to 125°C.
- Is the TPS3897ADRYR pin-for-pin compatible with other devices?
Yes, it is pin-for-pin compatible with MAX6895/6/7/8 devices.
- How can multiple supply rails be monitored using the TPS3897ADRYR?
Multiple devices can be used to monitor multiple supply rails with a single output signal using wired-OR logic.
- What is the purpose of the ENABLE pin on the TPS3897ADRYR?
The ENABLE pin is used to enable or disable the output based on its state.
- What is the hysteresis voltage for the TPS3897ADRYR?
The hysteresis voltage is 5 mV.
- How does the TPS3897ADRYR handle undervoltage lockout?
The device deasserts the output when VCC falls below the UVLO threshold of 1.3 V to 1.7 V.
