Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - buffer amplifiers, repeaters I²C 400 kHz SOIC 8

FEATURES

GND

DPACKAGE

(TOP VIEW)

GND NC

P PACKAGE

(TOP VIEW)

NC – Nointernalconnection

DESCRIPTION/ORDERING INFORMATION

P82B715

C BUS EXTENDER

SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008

www.ti.com

• Operating Power-Supply Voltage Range of • Multi-Drop Distribution of I

C Signals Using

3 V to 12 V Low-Cost Twisted-Pair Cables

• Supports Bidirectional Data Transfer of I

C • I

C Bus Operation Over 50 Meters of

Bus Signals Twisted-Pair Wire

• Allows Bus Capacitance of 400 pF on Main I

C • Latch-up Performance Exceeds 100 mA Per

Bus (Sx/Sy Side) and 3000 pF on Transmission JESD 78, Class II

Side (Lx/Ly Side)

• ESD Protection Exceeds JESD 22

• Dual Bidirectional Unity-Voltage-Gain Buffer

– 2500-V Human-Body Model (A114-A)

With No External Directional Control Required

– 400-V Machine Model (A115-A)

• Drives 10 × Lower-Impedance Bus Wiring for

– 1000-V Charged-Device Model (C101)

Improved Noise Immunity

The P82B715 is a bipolar device intended for I

C bus systems applications and supports bidirectional data

transfer via the I

C bus. The P82B715 buffers both the serial data (SDA) and serial clock (SCL) signals on the

C bus and allows for extension of the I

C bus, while retaining all the operating modes and features of the I

system.

ORDERING INFORMATION

PACKAGE

(1) (2)

ORDERABLE PART NUMBER TOP-SIDE MARKING

PDIP – P Tube of 50 P82B715P P82B715P

– 40 ° C to 85 ° C Tube of 75 P82B715D

SOIC – D PG715

Reel of 2500 P82B715DR

(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging .

(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com .

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas 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.

Summary of content (17 pages)

PAGE 1
P82B715 I2C BUS EXTENDER www.ti.
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P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 DESCRIPTION/ORDERING INFORMATION (CONTINUED) In general, the I2C bus capacitance limit of 400 pF restricts practical communication distances to a few meters. One of the advantages of the P82B715 is that it can isolate bus capacitance such that the total loading (devices, connectors, traces and wires) of the new bus or remote I2C nodes are not apparent to other I2C buses (or nodes).
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P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 ISx = ILx ILx = 10 ´ ISx ISx ISx Current Sense 30 W 2 I C Bus Sx Lx Buffered Bus 9 ´ ISx VCC + – GND Figure 1. Equivalent Circuit (One-Half of P82B715) Functional Description Sx and Sy The I2C pins (Sx and Sy) are designed to interface with a normal I2C bus. The maximum I2C bus supply voltage is 12 V. The Sx and Sy pins contain identical circuitry and can be used interchangeably as SCL or SDA.
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P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) VCC Vb Supply voltage range MIN MAX –0.
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P82B715 I2C BUS EXTENDER www.ti.
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P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 PARAMETER MEASUREMENT INFORMATION 5V Input Current 270 Ω 4.7 kΩ Sx Lx P82B715 Input 4.7 kΩ Lx Sx P82B715 5V Output Input and Output Voltage 0V td I = 6 mA td Figure 2.
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P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 APPLICATION INFORMATION By using two (or more) P82B715 devices, a subsystem can be built that retains the interface characteristics of a normal I2C device so that the subsystem may be included in, or added to, any I2C or related system. The subsystem features a low-impedance or buffered bus capable of driving large wiring capacitance (see Figure 3).
PAGE 8
P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 This arrangement, using multiple pullups as shown in Figure 4, provides the best system performance and allows stand-alone operation of individual I2C buses if parts of the extended system are disconnected or reconnected.
PAGE 9
P82B715 I2C BUS EXTENDER www.ti.com SCPS145A – DECEMBER 2007 – REVISED FEBRUARY 2008 To calculate the current sunk by the Lx pin of the buffer at I2C 1, note that the current in R1 is sunk directly by the device at I2C 1. The buffer, therefore, sinks only the currents flowing in R2, R3, and R4, so the effective pullup is R2 in parallel with R3 and R4. In this example that is 1 kΩ||10 kΩ||10 kΩ = 833 Ω. For a 5.5-V supply and 0.4-V low, the buffer is sinking 16.3 mA.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 20-May-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 12
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device P82B715DR Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) P82B715DR SOIC D 8 2500 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.