The CBM809X series, a high-performance microprocessor monitoring circuit developed by Xinbai Microelectronics, is specifically designed to ensure power reliability in digital systems. Its core function involves real-time voltage tracking and delivering stable reset signals during power-on, power-off, and voltage fluctuation scenarios throughout the entire lifecycle. This guarantees microprocessor startup and operation in stable conditions, making it widely applicable in power-sensitive fields such as industrial control and portable devices. As a dedicated power monitoring component, it excels in low power consumption, high precision, and simplified design, serving as the "power safety guardian" for microprocessor systems.

Core functions: accurate monitoring and reliable reset

The CBM809X series delivers precise 24/7 power status monitoring with stable reset signal output. Featuring a push R ( —— ) E ( —— ) S ( —— ) E ( —— ) T ( —— )  -pull reset output structure (low-level effective), it eliminates the need for external pull-up resistors compared to open-drain counterparts, enabling direct drive of downstream circuits. This design simplifies PCB layout, reduces material costs and circuit complexity, and is particularly suitable for cost control in mass production equipment.

In terms of voltage monitoring accuracy, the device offers seven precise reset threshold voltage options, ranging from 2.32V (CBM809Z) to 4.63V (CBM809L). The reset function ensures reliability throughout the power supply's entire lifecycle: Upon power-on, the internal timer maintains the reset signal for at least 140ms (typically 240ms), and the system only activates after the power supply has fully stabilized.

The CBM809X series also features low power consumption, with a static current as low as 17μA, far lower than traditional monitoring circuits. Additionally, the chip incorporates built-in VCC transient protection, eliminating the need for external filter capacitors to resist voltage fluctuations, thereby enhancing circuit stability.

Performance and packaging: hard power for multiple scenarios

The CBM809X series demonstrates exceptional environmental adaptability and engineering compatibility. With an operational temperature range of-40°C to 85°C, it withstands harsh conditions including workshop heat and outdoor cold. Its extended storage temperature range of-65°C to 150°C ensures stable performance during transportation and storage, eliminating concerns about extreme environmental impacts on components.

The packaging design balances miniaturization with mass production requirements, offering two 3-pin package solutions: The SOT-23 package measures 2.9mmX1.3mmX1.0mm with a thermal resistance of 270°C/W, ideal for conventional compact devices; the SC70 package is even more compact at 2.0mmX1.25mmX0.95mm with a thermal resistance of 146°C/W, suitable for scenarios requiring tight space like drone modules and micro-sensors.

Typical applications: from portable devices to industrial systems

In the portable electronics sector, the CBM809X series delivers exceptional performance with its 17μA ultra-low power consumption, significantly extending battery life. The 1V low-voltage reset mechanism effectively addresses battery under-voltage scenarios, while its compact design saves valuable internal space, ensuring stable operation during extended outdoor use. For industrial control applications where PLCs and frequency converters demand extreme power stability, the series' wide-temperature tolerance withstands workshop temperature fluctuations, with push-pull output ensuring zero-latency reset signal transmission. Additionally, the CBM809X series finds applications in smart instrumentation and consumer electronics peripherals: precise threshold voltage prevents power fluctuations from interfering with data acquisition, while the 4.38V reset threshold model enables direct compatibility with power systems, simplifying circuit design and reducing production costs.