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
(EN)
