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| TCA9406DCTR Datasheet, PDF (2/21 Pages) Texas Instruments – 2-BIT BIDIRECTIONAL 1MHz, I2C BUS AND SMBUS VOLTAGE-LEVEL TRANSLATOR WITH 8kV HBM ESD | |||
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TCA9406
SCPS221B â OCTOBER 2010 â REVISED JUNE 2013
www.ti.com
The TCA9406 is not a bus buffer like the PCA9515B and PCA9517. The OE feature can be utilized to isolate
one side of the bus from the other by placing both sides into a high impedence state.
The Enable (OE) should be tied to GND through a pulldown resistor to ensure the high-impedance state
during power up or power down. The minimum value of the resistor is determined by the current-sourcing
capability of the driver.
ORDERING INFORMATION
For package and ordering information, see the Package Option Addendum at the end of this document.
NO.
DQM,
DCU
YZP
1
A1
2
B1
3
C1
4
D1
5
D2
6
C2
7
B2
8
A2
NAME
SDA_B
GND
VCCA
SDA_A
SCL_A
OE
VCCB
SCL_B
TYPE
I/O
GND
PWR
I/O
I/O
Input
PWR
I/O
PIN DESCRIPTION
FUNCTION
Input/output B. Referenced to VCCB. Allow I2C_SDA configured to 2.5V/3.3V/5V
Ground
A-port supply voltage. 1.65 V ⤠VCCA ⤠3.6 V and VCCA ⤠VCCB. Configuration for
SDA_A, SCL_A, and OE
Input/output A. Referenced to VCCA. Allows I2C_SDA configured to 1.8V, 2.5V, 3.3V
Input/output A. Referenced to VCCA. Allows I2C_SCL configured to 1.8V, 2.5V, 3.3V
Output enable (active High). Referenced to VCCA. Pull OE to LOW to place all outputs
in tri-state mode.
B-port supply voltage. 2.3 V ⤠VCCB ⤠5.5 V for SDA_B, SCL_B
Input/output B. Referenced to VCCB. Allow I2C_SCL configured to 2.5V/3.3V/5V
1.8V
0.1 F
Master
I2C
Bus
TYPICAL OPERATING CIRCUIT
Optional Resistors
VCCA
SDA_A
SCL_A
VCCB
SDA_B
SCL_B
OE
I2C
Bus
Devices
3.3V
Design Notes:
OE can be tied directly to 1.8V (VCCA) to always be in ENABLE mode.
2
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