Datasheet

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 I
2
C 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 I
2
C 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 I
2
C devices, in addition to SMBus devices. Standard-mode I
2
C devices
only specify 3 mA in a generic I
2
C 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
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
(3)
Reel of 3000 PCA9306DCTR
SSOP – DCT 7BD_ _ _
Reel of 250 PCA9306DCTT
uQFN – DQE Reel of 5000 PCA9306DQER 7F
–40°C to 85°C
uCSP – YZT Reel of 3000 PCA9306YZTR _ _ _7FS
Reel of 3000 PCA9306DCUR
VSSOP – DCU 7BD_
Reel of 250 PCA9306DCUT
(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.
TERMINAL FUNCTIONS
TERMINAL
NO.
DESCRIPTION
NAME
DCT, DCU,
YZT
DQE
GND 1 A1 Ground, 0 V
V
REF1
2 B1 Low-voltage-side reference supply voltage for SCL1 and SDA1
SCL1 3 C1 Serial clock, low-voltage side
SDA1 4 D1 Serial data, low-voltage side
SDA2 5 D2 Serial data, high-voltage side
SCL2 6 C2 Serial clock, high-voltage side
V
REF2
7 B2 High-voltage-side reference supply voltage for SCL2 and SDA2
EN 8 A2 Switch enable input
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