Overview
The STM6905TZEDS6F is a quintuple voltage supervisor IC produced by STMicroelectronics. This device is designed to monitor up to five system power supply voltages, making it suitable for applications requiring multiple voltage monitoring. It is particularly targeted at set-top boxes (STBs), portable battery-powered systems, networking and communication systems, and other multi-voltage systems.
The STM6905 features a low voltage and low supply current design, with a primary supply voltage monitor (VCC) and a second fixed voltage monitor (V2IN), along with three adjustable supply monitor inputs (V3IN, V4IN, V5IN). The device includes a push-button type manual reset input (MR) and an open-drain reset output (RST).
Key Specifications
| Parameter | Description | Value | Unit |
|---|---|---|---|
| Primary Supply Voltage (VCC) | Fixed reset thresholds | 3.078 V to 2.866 V | V |
| Second Fixed Voltage (V2IN) | Fixed reset thresholds | 2.333 V to 1.050 V | V |
| Adjustable Voltage Inputs (V3IN, V4IN, V5IN) | Externally adjustable using 600 mV internal reference | - | - |
| Reset Output (RST) | Open-drain, active-low | - | - |
| Manual Reset Input (MR) | Active-low with internal 10 kΩ pull-up resistor | - | - |
| Supply Current | Typical value | 12 µA | µA |
| Power Supply Voltage Range | - | 0.8 V to 5.5 V | V |
| Reset Delay Time (tREC) | Typical value on power-up | 210 ms | ms |
| Operating Temperature Range | - | -40 °C to 85 °C | °C |
| Package Type | - | 8-pin MSOP/TSSOP | - |
Key Features
- Quintuple voltage monitoring capability
- Accurate ±1.8% voltage threshold across temperature (±1% at 25 °C)
- Two fixed (factory-programmed) reset thresholds for VCC and V2IN
- Three externally adjustable supply monitor inputs using a 600 mV internal reference
- Low supply current of 12 µA (typical)
- Open-drain reset output (RST) with 10 kΩ internal pull-up resistor
- Manual reset input (MR) with internal pull-up resistor
- Reset delay time (tREC) of 210 ms (typical) on power-up
- RoHS compliant (green package)
- Operating temperature range of -40 °C to 85 °C
Applications
- Set-top boxes (STBs)
- Portable, battery-powered systems
- Networking and communication systems
- Cable/satellite applications
- Computer systems
- Data storage equipment
- Multi-voltage systems
Q & A
- What is the primary function of the STM6905TZEDS6F?
The primary function of the STM6905TZEDS6F is to monitor up to five system power supply voltages and provide a reset signal if any of these voltages drop below their respective thresholds.
- What are the fixed reset thresholds for VCC and V2IN?
The fixed reset thresholds for VCC are 3.078 V to 2.866 V, and for V2IN, they are 2.333 V to 1.050 V.
- How are the adjustable voltage inputs (V3IN, V4IN, V5IN) set?
The adjustable voltage inputs are set using an external resistor-divider network with a 600 mV internal reference.
- What is the typical supply current of the STM6905TZEDS6F?
The typical supply current is 12 µA.
- What is the reset delay time (tREC) on power-up?
The reset delay time (tREC) on power-up is typically 210 ms.
- What is the operating temperature range of the STM6905TZEDS6F?
The operating temperature range is -40 °C to 85 °C.
- What type of package is the STM6905TZEDS6F available in?
The STM6905TZEDS6F is available in an 8-pin MSOP/TSSOP package.
- Is the STM6905TZEDS6F RoHS compliant?
Yes, the STM6905TZEDS6F is RoHS compliant.
- How does the manual reset input (MR) work?
The manual reset input (MR) is an active-low input with an internal 10 kΩ pull-up resistor. When MR goes low, the RST output is driven low and remains low until MR returns to high and for the tREC period thereafter.
- What are some common applications of the STM6905TZEDS6F?
Common applications include set-top boxes, portable battery-powered systems, networking and communication systems, cable/satellite applications, computer systems, and data storage equipment.
