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PCA9518 Status: ACTIVE

Expandable Five-Channel I2C Hub


      
         
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Datasheet

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 PCA9518
VCC(Min)(V)3  
VCC(Max)(V)3.6  
Technology FamilyPCA  
Pin/Package20SOIC, 20SSOP, 20SSOP/QSOP, 20TSSOP  
Max Frequency(kHz)400  
Vcc range(V)3.0 to 3.6  
Channel Width5  
EXP PinYes  
Master Side I2C Bus Capacitance Supported(pF)400  
Slave Side I2C Bus Capacitance Supported(pF)400  
5V Tolerant I/OYes  
Open–Drain I/O TypeYes  
Enable PinYes  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • P82B715: I2C Bus Extender
  • PCA9515A: Dual Bidirectional I2C Bus and SMBus Repeater
  • P82B96: Dual Bidirectional Bus Buffer
  • TPS2021: 0.66A, 2.7-5.5V Single Power Distribution Switch IC Hi-Side MOSFET, Fault Report, Act-Low Enable
  • SN74LV273A: Octal D-Type Flip-Flops With Clear
  • TPS76328: Single Output LDO, 150mA, Fixed(2.8V), Low Quiescent Current, Thermal Protection

Product Information

Features

  • Expandable Five-Channel BidirectionalBuffer
  • 400-kHz Fast I2C Bus
  • Operating VCC Range of 3 V to 3.6 V
  • 5-V Tolerant I2C and Enable Input Pins to Support Mixed-Mode Signal Operation
  • Active-High Individual Repeater Enable Inputs
  • Open-Drain Input/Outputs
  • Lockup-Free Operation
  • Supports Arbitration and Clock Stretching Across the Repeater
  • Supports Multiple Masters
  • Powered-Off High-Impedance I2C Pins
  • I2C Bus and SMBus Compatible
  • Latchup Performance Exceeds 100 mA Per JESD 78
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

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DESCRIPTION/ORDERING INFORMATION

The PCA9518 is an expandable five-channel bidirectional buffer for I2C and SMBus applications. The I2C protocol requires a maximum bus capacitance of 400 pF, which is derived from the number of devices on the I2C bus and the bus length. The PCA9518 overcomes this restriction by separating and buffering the I2C data (SDA) and clock (SCL) lines into multiple groups of 400-pF segments. Any segment-to-segment transition sees only one repeater delay. Each PCA9518 can communicate with other PCA9518 hubs through a 4-wire inter-hub expansion bus. Using multiple PCA9518 parts, any width hub (in multiples of five) can be implemented using the expansion pins, with only one repeater delay and no functional degradation of the system performance.

The device is designed for 3-V to 3.6-V VCC operation, but it has 5-V tolerant I2C and enable (EN) input pins. This feature allows for translation from 3 V to 5 V between a master and slave. The enable pin also can be used to electrically isolate a repeater segment from the I2C bus. This is useful in cases where one segment needs to run at 100 kHz while the rest of the system is at 400 kHz. 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.

The output low levels for each internal buffer are approximately 0.5 V, but the input voltage of each internal buffer must be 70 mV or more below the output low level, when the output internally is driven low. This prevents a lockup condition from occurring when the input low condition is released.

A PCA9518 cluster cannot be put in series with a repeater such as the PCA9515 or another PCA9518 cluster, as the design does not allow this configuration. Multiple PCA9518 devices can be grouped with other PCA9518 devices into any size cluster using the EXPxxxx pins that allow the I2C signals to be sent or received from one PCA9518 to another PCA9518 within the cluster. Because there is no direction pin, slightly different valid low voltage levels are used to avoid lockup conditions between the input and the output of individual repeaters in the cluster. A valid low applied at the input of any of the PCA9518 devices is propagated as a buffered low, with a slightly higher value, to all enabled outputs in the PCA9518 cluster. When this buffered low is applied to another repeater or separate PCA9518 cluster (not connected via the EXPxxxx pins) in series, the second repeater or PCA9518 cluster does not recognize it as a regular low and does not propagate it as a buffered low again. For this reason, the PCA9518 should not be put in series with other repeater or PCA9518 clusters.

The PCA9518 has five multidirectional open-drain buffers designed to support the standard low-level-contention arbitration of the I2C bus. Except during arbitration or clock stretching, the PCA9518 acts like a pair of noninverting open-drain buffers, one for SDA and one for SCL.

There is an internal power-on-reset circuit (VPOR) that allows for an initial condition and the ramping of VCC to set the internal logic.

As with the standard I2C system, pullup resistors are required on each SDAn and SCLn to provide the logic high levels on the buffered bus. The size of these pullup resistors depends on the system, but it is essential that each side of the repeater 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.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierFootprintsSamples
PCA9518DBQRACTIVE-40 to 850.85 | 1kuSSOP/QSOP (DBQ) | 20 View 2500 | LARGE T&R Download CAD Format for this Footprint
PCA9518DBQRG4ACTIVE-40 to 850.85 | 1kuSSOP/QSOP (DBQ) | 20 View 2500 | LARGE T&R Download CAD Format for this Footprint
PCA9518DBRACTIVE-40 to 850.85 | 1kuSSOP (DB) | 20 View 2000 | LARGE T&R Download CAD Format for this Footprint
PCA9518DBRG4ACTIVE-40 to 850.85 | 1kuSSOP (DB) | 20 View 2000 | LARGE T&R Download CAD Format for this Footprint
PCA9518DBTACTIVE-40 to 850.85 | 1kuSSOP (DB) | 20 View 250 | SMALL T&R Download CAD Format for this FootprintPurchase Samples
PCA9518DBTG4ACTIVE-40 to 850.85 | 1kuSSOP (DB) | 20 View 250 | SMALL T&R Download CAD Format for this FootprintPurchase Samples
PCA9518DWACTIVE-40 to 850.95 | 1kuSOIC (DW) | 20 View 25 | TUBE Download CAD Format for this FootprintPurchase Samples
PCA9518DWG4ACTIVE-40 to 850.95 | 1kuSOIC (DW) | 20 View 25 | TUBE Download CAD Format for this FootprintPurchase Samples
PCA9518DWRACTIVE-40 to 850.85 | 1kuSOIC (DW) | 20 View 2000 | LARGE T&R Download CAD Format for this Footprint
PCA9518DWRG4ACTIVE-40 to 850.85 | 1kuSOIC (DW) | 20 View 2000 | LARGE T&R Download CAD Format for this Footprint
PCA9518DWTACTIVE-40 to 850.85 | 1kuSOIC (DW) | 20 View 250 | SMALL T&R Download CAD Format for this FootprintPurchase Samples
PCA9518DWTG4ACTIVE-40 to 850.85 | 1kuSOIC (DW) | 20 View 250 | SMALL T&R Download CAD Format for this FootprintPurchase Samples
PCA9518PWACTIVE-40 to 850.95 | 1kuTSSOP (PW) | 20 View 70 | TUBE Download CAD Format for this FootprintPurchase Samples
PCA9518PWRACTIVE-40 to 850.85 | 1kuTSSOP (PW) | 20 View 2000 | LARGE T&R Download CAD Format for this Footprint
PCA9518PWTACTIVE-40 to 850.85 | 1kuTSSOP (PW) | 20 View 250 | SMALL T&R Download CAD Format for this FootprintPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 11:43 AM GMT, 22 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 18 WeeksPCA9518DBQR
AsiaWPI >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 18 WeeksPCA9518DBQRG4
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DBR
AmericasArrow >1k
AsiaWPI >1k
WorldwideDigiKey >1k
TI Lead Time*: 18 WeeksPCA9518DBRG4
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DBT
AmericasNewark 390
AsiaFarnell Asia 390
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DBTG4
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DW
AmericasAvnet 324
Newark 258
AsiaFarnell Asia 258
EuropeAvnet-SILICA 325
WorldwideDigiKey  Available
Mouser Electronics 294
TI Lead Time*: 18 WeeksPCA9518DWG4
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DWR
AmericasArrow >1k
AsiaWPI >1k
EuropeAvnet-SILICA >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 18 WeeksPCA9518DWRG4
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DWT
WorldwideDigiKey  Available
TI Lead Time*: 18 WeeksPCA9518DWTG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCA9518PW
AmericasArrow 453
Newark 275
AsiaFarnell Asia 275
EuropeAvnet-SILICA 200
WorldwideMouser Electronics 315
TI Lead Time*: 20 WeeksPCA9518PWR
AmericasArrow >1k
AsiaWPI >1k
WorldwideMouser Electronics 435
TI Lead Time*: 20 WeeksPCA9518PWT
None Reported
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** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
PCA9518DBQR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
PCA9518DBQRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
PCA9518DBR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DBRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DBT RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DBTG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DWR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DWRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DWT RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518DWTG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518PW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518PWR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9518PWT RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for PCA9518 Help

Datasheet

Application Notes

Selection Guides

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