P82B96_15 Datasheet, PDF (1/34 Pages) Texas Instruments – I2C Compatible Dual Bidirectional Bus Buffer

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P82B96
SCPS144C – MAY 2006 – REVISED MAY 2015
P82B96 I²C Compatible Dual Bidirectional Bus Buffer
1 Features
•1 Operating Power-Supply Voltage Range
of 2 V to 15 V
• Can Interface Between I²C Buses Operating at
Different Logic Levels (2 V to 15 V)
• Longer Cables by allowing bus capacitance of
400 pF on Main Side (Sx/Sy) and 4000 pF on
Transmission Side (Tx/Ty)
• Outputs on the Transmission Side (Tx/Ty) Have
High Current Sink Capability for Driving Low-
Impedance or High-Capacitive Buses
• Interface With Optoelectrical Isolators and Similar
Devices That Need Unidirectional Input and
Output Signal Paths by Splitting I²C Bus Signals
Into Pairs of Forward (Tx/Ty) and Reverse (Rx/Ry)
Signals
• 400-kHz Fast I²C Bus Operation Over at Least
20 Meters of Wire
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
2 Applications
• HDMI DDC
• Long I²C Communication
• Galvanic I²C Isolation
• Industrial Communications
3 Description
The P82B96 device is a bus buffer that supports
bidirectional data transfer between an I²C bus and a
range of other bus configurations with different
voltage and current levels.
One of the advantages of the P82B96 is that it
supports longer cables/traces and allows for more
devices per I²C bus because it can isolate bus
capacitance such that the total loading (devices and
trace lengths) of the new bus or remote I²C nodes
are not apparent to other I²C buses (or nodes). The
restrictions on the number of I²C devices in a system
due to capacitance, or the physical separation
between them, are greatly improved.
The device is able to provide galvanic isolation
(optocoupling) or use balanced transmission lines
(twisted pairs), because separate directional Tx and
Rx signals are provided. The Tx and Rx signals may
be connected directly (without causing bus latching),
to provide an bidirectional signal line with I²C
properties (open-drain driver). Likewise, the Ty and
Ry signals may also be connected together to provide
an bidirectional signal line with I²C properties (open-
drain driver). This allows for a simple communication
design, saving design time and costs.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
P82B96
VSSOP (8)
PDIP (8)
3.00 mm × 3.00 mm
9.81 mm × 6.35 mm
TSSOP (8)
3.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Main Enclosure
12 V
3.3–5 V
Long-Distance I²C Communications
Remote-Control Enclosure
12 V
Long Cables
3.3–5 V
SCL
3.3–5 V
12 V
SCL
3.3–5 V
SDA
P82B96
P82B96
SDA
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.