PCA9306_08 Datasheet, PDF (1/16 Pages) Texas Instruments – DUAL BIDIRECTIONAL I2C BUS AND SMBus VOLTAGE-LEVEL TRANSLATOR

PCA9306
www.ti.com....................................................................................................................................................... SCPS113I – OCTOBER 2004 – REVISED JULY 2008
DUAL BIDIRECTIONAL I²C BUS AND SMBus
VOLTAGE-LEVEL TRANSLATOR
FEATURES
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• 2-Bit Bidirectional Translator for SDA and SCL
Lines in Mixed-Mode I²C Applications
• I²C and SMBus Compatible
• Less Than 1.5-ns Maximum Propagation Delay
to Accommodate Standard-Mode and
Fast-Mode I²C Devices and Multiple Masters
• Allows Voltage-Level Translator Between
– 1.2-V V_REF1 and 1.8-V, 2.5-V, 3.3-V,
or 5-V V_REF2
– 1.8-V V_REF1 and 2.5-V, 3.3-V, or 5-V V_REF2
– 2.5-V V_REF1 and 3.3-V or 5-V V_REF2
– 3.3-V V_REF1 and 5-V V_REF2
• Provides Bidirectional Voltage Translation
With No Direction Pin
• Low 3.5-Ω ON-State Connection Between Input
and Output Ports Provides Less Signal
Distortion
• Open-Drain I²C I/O Ports (SCL1, SDA1, SCL2,
and SDA2)
• 5-V Tolerant I²C I/O Ports to Support
Mixed-Mode Signal Operation
• High-Impedance SCL1, SDA1, SCL2, and SDA2
Pins for EN = Low
• Lock-Up-Free Operation for Isolation When
EN = Low
• Flow-Through Pinout for Ease of Printed
Circuit Board Trace Routing
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
DCT OR DCU PACKAGE
(TOP VIEW)
GND 1
V_{REF1 2}
SCL1 3
SDA1 4
8 EN
7
V_REF2
6 SCL2
5 SDA2
DESCRIPTION/ORDERING INFORMATION
This dual bidirectional I²C and SMBus voltage-level translator, with an enable (EN) input, is operational from
1.2-V to 3.3-V V_REF1 and 1.8-V to 5.5-V V_REF2.
The PCA9306 allows bidirectional voltage translations between 1.2 V and 5 V, without the use of a direction pin.
The low ON-state resistance (r_on) of the switch allows connections to be made with minimal propagation delay.
When EN is high, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2
I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and
a high-impedance state exists between ports.
In I²C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the
PCA9306 enables the system designer to isolate two halves of a bus; thus, more I²C devices or longer trace
length can be accommodated.
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.
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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