TCA9509DGKR

This TCA9509 integrated circuit is an I2C bus/SMBus
Repeater for use in I2C/SMBus systems. It can
also provide bidirectional voltage-level translation (uptranslation/down-translation) between low voltages
(down to 0.9 V) and higher voltages (2.7 V to 5.5
V) in mixed-mode applications. This device enables
I
2C 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 400-pF 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/Os
are overvoltage tolerant to 5.5 V. The A-side I/Os
are overvoltage tolerant to 5.5 V when the device is
unpowered (VCCB and/or VCCA = 0 V).

Category: Splitters

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SPECIFICATION

• Two-channel bidirectional buffer
• I2C bus and SMBus compatible
• Operating supply voltage range of
2.7 V to 5.5 V on B side
• Operating voltage range of 0.9 V to 5.5 V on
A side
• Voltage-level translation from
0.9 V to 5.5 V and 2.7 V to 5.5 V
• Active-high repeater-enable input
• Requires no external pullup resistors on
lower-voltage port-A
• Open-drain I2C I/O
• 5.5-V Tolerant I2C and enable input support mixedmode signal operation
• Lockup-free operation
• Accommodates standard mode and fast mode I2C
devices and multiple controllers
• Supports arbitration and clock stretching across
Repeater
• Powered-off high-impedance I2C bus pins
• Supports 400-kHz fast I2C bus operating speeds
• Available in
– 1.6-mm × 1.6-mm, 0.4-mm height, 0.5-mm
pitch QFN package
– 3-mm × 3-mm Industry standard MSOP
package
• Latch-up performance exceeds 100 mA Per JESD
78, class II
• ESD protection exceeds JESD 22
– 2000-V Human-body model (A114-A)
– 1000-V Charged-device model (C101)