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PCA9517 Status: ACTIVE

Level-Translating I2C Bus Repeater


      
         
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 PCA9517
VCC(Min)(V)0.9  
VCC(Max)(V)5.5  
Technology FamilyPCA  
Pin/Package8MSOP, 8SOIC  
Max Frequency(kHz)400  
Vcc range(V)0.9 to 5.5  
Channel Width2  
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

  • P82B96: Dual Bidirectional Bus Buffer
  • PCA9515A: Dual Bidirectional I2C Bus and SMBus Repeater
  • PCA9306: Dual Bi-Directional I2C-Bus and SMBus Voltage Level-Translator
  • SN74CBTLV3257: Low-Voltage 4-Bit 1-Of-2 FET Multiplexer/Demultiplexer
  • CC2500: Low Cost, Low-Power 2.4 GHz RF Transceiver Designed for Low-Power Wireless Apps in the 2.4 GHz ISM B

Product Information

Features

  • Two-Channel Bidirectional Buffer
  • I2C Bus and SMBus Compatible
  • Operating Supply Voltage Range of 0.9 V to 5.5 V on A Side
  • Operating Supply Voltage Range of 2.7 V to 5.5 V on B Side
  • Voltage-Level Translation From 0.9 V to 5.5 V and 2.7 V to 5.5 V
  • Footprint and Function Replacement for PCA9515A
  • Active-High Repeater-Enable Input
  • Open-Drain I2C I/O
  • 5.5-V Tolerant I2C and Enable Input Support Mixed-Mode Signal Operation
  • Lockup-Free Operation
  • Accommodates Standard Mode and Fast Mode I2C Devices and Multiple Masters
  • Supports Arbitration and Clock Stretching Across Repeater
  • Powered-Off High-Impedance I2C Pins
  • 400-kHz Fast I2C Bus
  • 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)

DESCRIPTION/ORDERING INFORMATION

This dual bidirectional I2C buffer is operational at 2.7 V to 5.5 V.

The PCA9517 is a BiCMOS integrated circuit intended for I2C bus and SMBus systems. It can also provide bidirectional voltage-level translation (up-translation/down-translation) between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting.

The PCA9517 buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, thus allowing two buses of 400-pF bus capacitance to be connected in an I2C application. This device can also be used to isolate two halves of a bus for voltage and capacitance.

The PCA9517 has two types of drivers—A-side drivers and B-side drivers. All inputs and I/Os are overvoltage tolerant to 5.5 V, even when the device is unpowered (VCCB and/or VCCA = 0 V).

The B-side drivers operate from 2.7 V to 5.5 V and behave like the drivers in the PCA9515A. This side also supports the standard low-level contention arbitration of the I2C bus and clock stretching. The output low level for this internal buffer is approximately 0.5 V, but the input voltage must be 70 mV or more below the output low level when the output internally is driven low. The higher-voltage low signal is called a buffered low. When the B-side I/O is driven low internally, the low is not recognized as a low by the input. This feature prevents a lockup condition from occurring when the input low condition is released.

This type of design on the B side prevents it from being used in series with the PCA9515A and another PCA9517 (B side). This is because these devices do not recognize buffered low signals as a valid low and do not propagate it as a buffered low again.

The A-side drivers operate from 0.9 V to 5.5 V and drive more current. They do not require the buffered low feature (or the static offset voltage). This means that a low signal on the B side translates to a nearly 0-V low on the A side, which accommodates smaller voltage swings of lower-voltage logic. The output pulldown on the A side drives a hard low, and the input level is set at 0.3 VCCA to accommodate the need for a lower low level in systems where the low-voltage-side supply voltage is as low as 0.9 V.

The A side of two or more PCA9517s can be connected together to allow a star topography, with the A side on the common bus. Also, the A side can be connected directly to any other buffer with static- or dynamic-offset voltage. Multiple PCA9517s can be connected in series, A side to B side, with no buildup in offset voltage and with only time-of-flight delays to consider.

The PCA9517 drivers are enabled when VCCA is above 0.8 V and VCCB is above 2.5 V.

The PCA9517 has an active-high enable (EN) input with an internal pullup to VCCB, which allows the user to select when the repeater is active. This can be used to isolate a badly behaved slave on power-up reset. It should never change state during an I2C operation, because disabling during a bus operation hangs the bus, and enabling part way through a bus cycle could confuse the I2C parts being enabled. The EN input should change state only when the global bus and repeater port are in an idle state, to prevent system failures.

The PCA9517 includes a power-up circuit that keeps the output drivers turned off until VCCB is above 2.5 V and the VCCA is above 0.8 V. VCCB and VCCA can be applied in any sequence at power up. After power up and with the EN high, a low level on the A side (below 0.3 VCCA) turns the corresponding B-side driver (either SDA or SCL) on and drives the B side down to approximately 0.5 V. When the A side rises above 0.3 VCCA, the B-side pulldown driver is turned off and the external pullup resistor pulls the pin high. When the B side falls first and goes below 0.3 VCCB, the A-side driver is turned on and the A side pulls down to 0 V. The B-side pulldown is not enabled unless the B-side voltage goes below 0.4 V. If the B-side low voltage does not go below 0.5 V, the A-side driver turns off when the B-side voltage is above 0.7 VCCB. If the B-side low voltage goes below 0.4 V, the B-side pulldown driver is enabled, and the B side is able to rise to only 0.5 V until the A side rises above 0.3 VCCA. Then the B side continues to rise, being pulled up by the external pullup resistor. VCCA is only used to provide the 0.3 VCCA reference to the A-side input comparators and for the power-good-detect circuit. The PCA9517 logic and all I/Os are powered by the VCCB pin.

As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the buffered bus. The PCA9517 has standard open-collector configuration of the I2C 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 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. Under certain conditions, higher termination currents can be used.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierFootprintsSamples
PCA9517DACTIVE-40 to 851.20 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this FootprintPurchase Samples
PCA9517DG4ACTIVE-40 to 851.20 | 1kuSOIC (D) | 8 View 75 | TUBE Download CAD Format for this FootprintPurchase Samples
PCA9517DGKRACTIVE-40 to 851.05 | 1kuMSOP (DGK) | 8 View 2500 | LARGE T&R Download CAD Format for this Footprint
PCA9517DGKRG4ACTIVE-40 to 851.05 | 1kuMSOP (DGK) | 8 View 2500 | LARGE T&R 
PCA9517DRACTIVE-40 to 851.05 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Footprint
PCA9517DRG4ACTIVE-40 to 851.05 | 1kuSOIC (D) | 8 View 2500 | LARGE T&R Download CAD Format for this Footprint

* 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 11:46 AM GMT, 24 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksPCA9517D
AmericasArrow 30
AsiaFarnell Asia 19
TI Lead Time*: 20 WeeksPCA9517DG4
WorldwideMouser Electronics 6
TI Lead Time*: 15 WeeksPCA9517DGKR
AmericasArrow >1k
AsiaWPI >1k
WorldwideDigiKey >1k
Mouser Electronics 514
TI Lead Time*: 15 WeeksPCA9517DGKRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCA9517DR
AmericasArrow >1k
TI Lead Time*: 20 WeeksPCA9517DRG4
None Reported
View Distributors
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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
PCA9517D RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9517DG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9517DGKR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9517DGKRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9517DR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCA9517DRG4 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 PCA9517 Help

Datasheet

Application Notes

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Simulation Models

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