PCA9306DQER Datasheet, PDF (2/22 Pages) Texas Instruments – DUAL BIDIRECTIONAL I2C BUS AND SMBus VOLTAGE-LEVEL TRANSLATOR

PCA9306
SCPS113J – OCTOBER 2004 – REVISED OCTOBER 2010
www.ti.com
The PCA9306 also can be used to run two buses, one at 400-kHz operating frequency and the other at 100-kHz
operating frequency. If the two buses are operating at different frequencies, the 100-kHz bus must be isolated
when the 400-kHz operation of the other bus is required. If the master is running at 400 kHz, the maximum
system operating frequency may be less than 400 kHz because of the delays added by the repeater.
As with the standard I²C system, pullup resistors are required to provide the logic high levels on the translator's
bus. The PCA9306 has a standard open-collector configuration of the I²C bus. The size of these pullup resistors
depends on the system, but each side of the repeater must have a pullup resistor. The device is designed to
work with standard-mode and fast-mode I²C devices, in addition to SMBus devices. Standard-mode I²C devices
only specify 3 mA in a generic I²C system where standard-mode devices and multiple masters are possible.
Under certain conditions, high termination currents can be used.
When the SDA1 or SDA2 port is low, the clamp is in the ON state, and a low resistance connection exists
between the SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port when the SDA2 port is
high, the voltage on the SDA1 port is limited to the voltage set by V_REF1. When the SDA1 port is high, the SDA2
port is pulled to the drain pullup supply voltage (V_DPU) by the pullup resistors. This functionality allows a
seamless translation between higher and lower voltages selected by the user, without the need for directional
control. The SCL1/SCL2 channel also functions as the SDA1/SDA2 channel.
All channels have the same electrical characteristics, and there is minimal deviation from one output to another in
voltage or propagation delay. This is a benefit over discrete transistor voltage translation solutions, since the
fabrication of the switch is symmetrical. The translator provides excellent ESD protection to lower-voltage devices
and at the same time protects less ESD-resistant devices.t
T_A
–40°C to 85°C
ORDERING INFORMATION⁽¹⁾
PACKAGE ⁽²⁾
ORDERABLE PART NUMBER
SSOP – DCT
Reel of 3000
Reel of 250
PCA9306DCTR
PCA9306DCTT
uQFN – DQE
Reel of 5000
PCA9306DQER
uCSP – YZT
Reel of 3000
PCA9306YZTR
VSSOP – DCU
Reel of 3000
Reel of 250
PCA9306DCUR
PCA9306DCUT
TOP-SIDE MARKING⁽³⁾
7BD_ _ _
7F
_ _ _7FS
7BD_
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(3) DCT/DQE/YZT/DCU: The actual top-side marking has three additional characters that designate the year, month, and wafer
fab/assembly site.
NAME
GND
V_REF1
SCL1
SDA1
SDA2
SCL2
V_REF2
EN
TERMINAL
NO.
DCT, DCU,
DQE
YZT
1
A1
2
B1
3
C1
4
D1
5
D2
6
C2
7
B2
8
A2
TERMINAL FUNCTIONS
DESCRIPTION
Ground, 0 V
Low-voltage-side reference supply voltage for SCL1 and SDA1
Serial clock, low-voltage side
Serial data, low-voltage side
Serial data, high-voltage side
Serial clock, high-voltage side
High-voltage-side reference supply voltage for SCL2 and SDA2
Switch enable input
2
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