General description

The PCA9512A/B is a hot swappable I2C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corruption of the data and clock buses and includes two dedicated supply voltage pins to provide level shifting between 3.3 V and 5 V systems while maintaining the best noise margin for each voltage level. Either pin may be powered with supply voltages ranging from 2.7 V to 5.5 V with no constraints on which supply voltage is higher. Control circuitry prevents the backplane from being connected to the card until a stop bit or bus idle occurs on the backplane without bus contention on the card. When the connection is made, the PCA9512A/B provides bidirectional buffering, keeping the backplane and card capacitances isolated.

Features and benefits

■ Bidirectional buffer for SDA and SCL lines increases fan-out and prevents SDA and SCL corruption during live board insertion and removal from multipoint backplane systems

■ Compatible with I2C-bus Standard mode, I2C-bus Fast mode, and SMBus standards

■ Built-in ΔV/Δt rise time accelerators on all SDA and SCL lines (0.6 V threshold) with ability to disable ΔV/Δt rise time accelerator through the ACC pin for lightly loaded systems, requires the bus pull-up voltage and respective supply voltage (VCC or VCC2) to be the same

■ 5 V to 3.3 V level translation with optimum noise margin

■ High-impedance SDAn and SCLn pins for VCC or VCC2 = 0 V

■ 1 V precharge on all SDAn and SCLn pins

■ Supports clock stretching and multiple master arbitration and synchronization

■ Operating power supply voltage range: 2.7 V to 5.5 V

■ 0 Hz to 400 kHz clock frequency

■ ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

■ Packages offered: SO8, TSSOP8 (MSOP8)

Applications

■ cPCI, VME, AdvancedTCA cards and other multipoint backplane cards that are required to be inserted or removed from an operating system

PCA9512ADP属于集成电路（IC） > 信号缓冲器、中继器、分离器。恩智浦半导体公司制造生产的PCA9512ADP信号缓冲器、中继器、分离器信号缓冲器、中继器和分离器系列中的产品适用于远距离电气互连或电缆系统的数字信息传输。所有实际互连系统都具有非理想特性，该系列产品主要用于解决数字信息传输过程中因此造成的模拟问题。此外，还有其他功能，例如不同物理接口样式之间的转换和多路复用。