The TCA9509DGKR is an I²C bus/SMBus Repeater for use in I²C/SMBus systems. It can also provide bidirectional voltage-level translation (up-translation/down-translation) between low voltages (down to 0.9V) and higher voltages (2.7 to 5.5V) in mixed-mode applications. This device enables I²C and similar bus systems to be extended, without degradation of performance even during level shifting. The TCA9509 buffers both the serial data (SDA) and the serial clock (SCL) signals on the I²C bus, thus allowing 400pF bus capacitance on the B-side. This device can also be used to isolate two halves of a bus for voltage and capacitance. The TCA9509 has two types of drivers, A-side drivers and B-side drivers. All inputs and B-side I/O"s are over-voltage tolerant to 5.5V. The A-side I/O"s are over-voltage tolerant to 5.5V when the device is unpowered (VCCB and/or VCCA=0V).
● Two-channel bidirectional buffer
● Active-high repeater-enable input
● Requires no external pull-up resistors on lower-voltage port-A
● Open-drain I²C I/O
● 5.5V Tolerant I²C and enable input support mixed-mode signal operation
● Lock-up free operation
● Accommodates standard-mode and fast-mode I²C devices and multiple masters
● Supports arbitration and clock stretching across repeater
● Powered-OFF high-impedance I²C-bus pins
● Green product and no Sb/Br
