Overview
The TPS3808G33DRVR, produced by Texas Instruments, is a part of the TPS3808 family of microprocessor supervisory circuits. This device is designed to monitor system voltages and assert a RESET signal when the monitored voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The TPS3808G33DRVR is particularly suited for applications requiring precise voltage monitoring and adjustable reset delay times.
It features a very low quiescent current of 2.4 μA, making it ideal for battery-powered and portable devices. The device is available in small SOT-23 and 2-mm × 2-mm WSON packages and operates over a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD Input Supply Range | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| IDD Supply Current | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 2.4 | 5 | μA |
| VOL Low-level Output Voltage | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| VIT Negative-going Input Threshold Accuracy | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| Threshold Voltage (VIT) for TPS3808G33 | 3.07 V | V | |||
| RESET Delay Time | CT = Open | 12 | 20 | 28 | ms |
| RESET Delay Time | CT = VDD | 180 | 300 | 420 | ms |
| Propagation Delay MR to RESET | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns |
Key Features
- Power-on reset generator with adjustable delay time: 1.25 ms to 10 s
- Very low quiescent current: 2.4 μA typical
- High threshold accuracy: 0.5% typical for VIT ≤ 3.3 V
- Fixed threshold voltages for standard voltage rails from 0.9 V to 5 V and adjustable voltage down to 0.4 V
- Manual reset (MR) input
- Open-drain RESET output
- Temperature range: –40°C to 125°C
- Small SOT-23 and 2-mm × 2-mm WSON packages
- User-adjustable reset delay time using an external capacitor
Applications
- DSP or microcontroller applications
- Notebook and desktop computers
- PDAs and hand-held products
- Portable and battery-powered products
- FPGA and ASIC applications
Q & A
- What is the typical quiescent current of the TPS3808G33DRVR?
The typical quiescent current is 2.4 μA.
- What is the range of adjustable delay times for the TPS3808G33DRVR?
The adjustable delay time ranges from 1.25 ms to 10 s.
- What are the available package types for the TPS3808G33DRVR?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G33DRVR?
The device operates over a temperature range of –40°C to 125°C.
- How is the reset delay time adjusted in the TPS3808G33DRVR?
The reset delay time can be adjusted by connecting the CT pin to VDD, leaving it open, or using an external capacitor.
- What is the threshold voltage for the TPS3808G33DRVR?
The threshold voltage for the TPS3808G33 is 3.07 V.
- What is the propagation delay from MR to RESET?
The propagation delay from MR to RESET is typically 150 ns.
- How does the device handle short negative transients on the SENSE pin?
The device is relatively immune to short negative transients on the SENSE pin, with sensitivity dependent on threshold overdrive.
- Can the TPS3808G33DRVR monitor multiple system voltages?
Yes, the device can monitor multiple system voltages using the MR pin and appropriate external circuitry.
- What type of capacitor should be used for the reset delay?
A low-leakage type capacitor, such as a ceramic capacitor, should be used to minimize errors in the reset delay time.
