Overview
The STM6904TWEDS6F is a quad, ultralow voltage supervisor designed by STMicroelectronics. This device is optimized for monitoring up to four system power supply voltages, making it suitable for a variety of applications including set-top boxes, multi-voltage systems, cable/satellite applications, computer systems, and data storage equipment. It features a low supply current and supports a push-button type manual reset input.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Primary Supply Voltage (VCC) | Operating voltage range | 0.8 to 5.5 V |
| VCC Reset Threshold (VRST1) | Factory-trimmed reset threshold at 25 °C | 3.078 V |
| V2IN Reset Threshold (VRST2) | Factory-trimmed reset threshold at 25 °C | 1.683 V |
| Adjustable Supply Monitor Inputs (V3IN, V4IN) | Externally adjustable using an internal 0.6 V reference | Adjustable |
| Reset Delay Time (tREC) | Selectable via TRSEL pin | 210 ms or 420 ms |
| Manual Reset Input (MR) | Active-low input with internal pull-up resistor | 10 kΩ pull-up |
| Reset Output (RST) | Active-low open drain output | Requires external pull-up resistor |
| Supply Current (ICC) | Typical supply current at VCC = 3.3 V | 12 µA |
| Operating Temperature | Industrial grade operating temperature range | -40 to 85 °C |
| Package | Package type and pin count | 8-pin MSOP/TSSOP |
Key Features
- Quad voltage monitoring with accurate ±1.8% across temperature voltage threshold (±1% at 25 °C)
- Primary supply (VCC) monitor with fixed reset thresholds
- Second fixed (V2IN) monitor with fixed reset thresholds
- Two additional adjustable supply monitor inputs (V3IN and V4IN) using an external resistor divider network
- 0.6 V internal reference voltage
- Manual reset input (MR) with internal pull-up resistor
- Reset delay time (tREC) selectable via TRSEL pin
- Low supply current of 12 µA (typical)
- RoHS compliant (green package)
- Operating temperature range: -40 to 85 °C (industrial grade)
Applications
- Set-top boxes
- Multi-voltage systems
- Cable/satellite applications
- Computer systems
- Data storage equipment
- Portable, battery-powered systems
- Networking and communication systems
Q & A
- What is the primary function of the STM6904TWEDS6F?
The STM6904TWEDS6F is designed to monitor up to four system power supply voltages and provide a reset signal if any of the monitored voltages drop below their respective thresholds.
- What are the fixed reset thresholds for VCC and V2IN in the STM6904TWEDS6F?
The fixed reset thresholds are 3.078 V for VCC and 1.683 V for V2IN at 25 °C.
- How are the adjustable supply monitor inputs (V3IN and V4IN) set?
The adjustable supply monitor inputs are set using an external resistor divider network with a 0.6 V internal reference voltage.
- What is the purpose of the TRSEL pin?
The TRSEL pin allows the user to select between two reset delay times (tREC): 210 ms or 420 ms.
- What is the typical supply current of the STM6904TWEDS6F?
The typical supply current is 12 µA at VCC = 3.3 V.
- What is the operating temperature range of the STM6904TWEDS6F?
The operating temperature range is -40 to 85 °C (industrial grade).
- What type of package does the STM6904TWEDS6F come in?
The device is available in an 8-pin MSOP/TSSOP package.
- Is the STM6904TWEDS6F RoHS compliant?
Yes, the STM6904TWEDS6F is RoHS compliant (green package)).
- What is the function of the manual reset input (MR)?
The manual reset input (MR) is an active-low input with an internal pull-up resistor that asserts the reset output when it goes low).
- How does the reset output (RST) work?
The reset output (RST) is an active-low open drain output that requires an external pull-up resistor. It is asserted low when any of the monitored voltages drop below their thresholds or when the MR input goes low).
