PCA9646PW,118

PCA9646 is a monolithic CMOS integrated circuit for 2-wire bus buffering and switching in applications including I²C-bus, SMBus, PMBus, and other systems based on similar principles. Each of the four outputs may be independently enabled in any combination as determined by the contents of the programmable control register. Each I/O is impedance isolated from all others, thus allowing a total of five branches of 2-wire bus with the maximum specified load. It includes a unidirectional buffer for the clock signal, and a bidirectional buffer for the data signal. The direction of the clock signal may also be set by the contents of the programmable control register. Clock stretching and timing must always be under control of the host device. It has excellent application to 2-wire bus address expansion and increasing of maximum load capacitance. Application includes large arrays of I²C-bus components, e.g., LED displays, power management systems, game consoles, computers, RAID systems.

• Drop-in pin compatible with PCA9546A, etc
• Each I/O is impedance isolated from all others allowing maximum capacitance on all branches
• 30mA static sink capability on all ports
• Fast switching times allow operation in excess of 1MHz
• Allows driving of large loads, hysteresis on I/O increases noise immunity
• Operating voltages from 2.7V to 5.5V
• Uncomplicated characteristic suitable for quick implementation in most common 2-wire bus application
• ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100mA
• 16 pin TSSOP package, ambient temperature range from -40 to +85°C