Overview
The STM6779VWB6F is a part of the STM6777/78/79/80 family of dual/triple ultra-low voltage supervisors designed by STMicroelectronics. These supervisors are engineered to monitor two or three system power supply voltages, making them ideal for applications such as set-top boxes (STBs), portable battery-powered systems, networking, and communication systems. The device features a push-button-type manual reset input and an optional delayed manual reset input, enhancing its versatility and reliability in various power management scenarios.
Key Specifications
| Parameter | Value |
|---|---|
| Primary Supply (VCC1) Monitor | Fixed (factory-programmed) reset thresholds: 4.63 V to 1.58 V |
| Secondary Supply (VCC2) Monitor | Fixed (factory-programmed) reset thresholds: 3.08 V to 0.79 V |
| Tertiary Supply Monitor | Externally adjustable RSTIN: 0.626 V internal reference |
| Reset Output (RST) | Push-pull or open drain; state guaranteed if VCC1 or VCC2 ≥ 0.8 V |
| Reset Delay Time (trec) on Power-Up | 13.2 ms, 210 ms, 900 ms (typ) |
| Manual Reset Input (MR) | Push-button-type manual reset input |
| Optional Delayed Manual Reset Input (MRC) | With external capacitor (typical 4 s delay with a 3.3 μF capacitor) |
| Supply Current | 11 μA (typ), VCC1 = VCC2 = 3.6 V |
| Operating Temperature | –40 °C to 85 °C (industrial grade) |
| Package | SOT23-6L |
Key Features
- Primary supply (VCC1) monitor with fixed (factory-programmed) reset thresholds.
- Secondary supply (VCC2) monitor with fixed (factory-programmed) reset thresholds.
- Tertiary supply monitor using an externally adjustable RSTIN threshold.
- Reset outputs (RST) available in push-pull or open drain configurations.
- Manual reset input (MR) and optional delayed manual reset input (MRC) with external capacitor.
- Low supply current of 11 μA (typ) at VCC1 = VCC2 = 3.6 V.
- Operating temperature range of –40 °C to 85 °C (industrial grade).
Applications
The STM6779VWB6F is suitable for a variety of applications, including:
- Set-top boxes (STBs).
- Portable, battery-powered systems.
- Networking and communication systems.
Q & A
- What is the primary function of the STM6779VWB6F?
The primary function is to monitor two or three system power supply voltages and provide reset signals if any of these voltages drop below their respective thresholds. - What are the reset thresholds for VCC1 and VCC2?
The reset thresholds for VCC1 range from 4.63 V to 1.58 V, and for VCC2, they range from 3.08 V to 0.79 V. - How does the manual reset input (MR) work?
The manual reset input (MR) is a push-button-type input that asserts a reset when driven low. It can also be delayed using an external capacitor connected to the MRC pin. - What is the typical supply current of the STM6779VWB6F?
The typical supply current is 11 μA at VCC1 = VCC2 = 3.6 V. - What is the operating temperature range of the STM6779VWB6F?
The operating temperature range is –40 °C to 85 °C (industrial grade). - What package types are available for the STM6779VWB6F?
The device is available in standard 5-pin or 6-pin SOT23 packages. - How does the tertiary supply monitor work?
The tertiary supply monitor uses an externally adjustable RSTIN threshold with a 0.626 V internal reference. - What are the typical reset delay times on power-up?
The typical reset delay times on power-up are 13.2 ms, 210 ms, and 900 ms. - Is the STM6779VWB6F RoHS compliant?
Yes, the STM6779VWB6F is RoHS compliant with an Ecopack3 grade. - What are some common applications for the STM6779VWB6F?
Common applications include set-top boxes, portable battery-powered systems, and networking and communication systems.
