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TCA9509DGKR
Level Translating I2C Bus Repeater
BUSA
TCA9509
SDA SDAA SDA
SCL SCLA SCL
BUSB
1.1V
SDAB
SCLB
VCCBVCCA
10 kW
3.3 V
SLAVE
400 kHz
BUS
MASTER
400 kHz
10 kW 10 kW
1.1 VCopyright © 2017,
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TCA9509SCPS225C –AUGUST 2011–REVISED DECEMBER 2017
TCA9509 Level-TranslatingI2C and SMBUS Bus Repeater Features Two-Channel Bidirectional BufferI2C Bus and SMBus Compatible Operating Supply Voltage Rangeof
2.7Vto 5.5VonB side Operating Voltage Rangeof 0.9Vto 5.5Von
A-Side Voltage-Level Translation From
0.9Vto 5.5V and 2.7Vto 5.5V Active-High Repeater-Enable Input Requires No External Pullup Resistors on
Lower-Voltage Port-A Open-DrainI2C I/O 5.5-V TolerantI2C and Enable Input Support
Mixed-Mode Signal Operation Lockup-Free Operation Accommodates Standard Mode and Fast Mode2C Devices and Multiple Masters Supports Arbitration and Clock Stretching Across
Repeater Powered-Off High-ImpedanceI2C Bus Pins Supports 400-kHz FastI2C Bus Operating Speeds Availablein 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, ClassII ESD Protection Exceeds JESD22 2000-V Human-Body Model (A114-A) 1000-V Charged-Device Model (C101)
Applications Equipment)
DescriptionThis TCA9509 integrated circuitis anI2C bus/SMBus
Repeater for useinI2 C/SMBus systems.It can also
provide bidirectional voltage-level translation (up-
translation/down-translation) between low voltages
(downto 0.9V) and higher voltages (2.7Vto 5.5V) mixed-mode applications. This device enablesI2C
and similar bus systems to be extended, without
degradationof performance even during level shifting.
The TCA9509 buffers both the serial data (SDA) and
the serial clock (SCL) signals on theI2C bus, thus
allowing 400-pF bus capacitance on the B-side. This
device can also be usedto isolate two halvesofa
busfor voltage and capacitance.
The TCA9509 has two typesof drivers– A-side
drivers and B-side drivers. All inputs and B-side I/Os
are overvoltage tolerantto 5.5V. The A-side I/Os are
overvoltage tolerant to 5.5V when the deviceis
unpowered (VCCB and/or VCCA=0 V).
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Simplified Schematic
