PCA9518AD

Expandable 5-channel I2C-bus hub


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The PCA9518A is a CMOS integrated circuit intended for application in I²C-bus and SMBus systems.

While retaining all the operating modes and features of the I²C-bus system, it permits extension of the I²C-bus by buffering both the data (SDA) and the clock (SCL) lines, thus enabling virtually an unlimited number of buses of 400 pF.

The I²C-bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9518A enables the system designer to divide the bus into an unlimited number of segments off of a hub where any segment to segment transition sees only one repeater delay and is multiple master capable on each segment.

Using multiple PCA9518A parts, any width hub (in multiples of five)1can be implemented using the expansion pins.

The PCA9518A is a wider voltage range (2.3 V to 3.6 V) version of the PCA9518 and also improves partial power-down performance, keeping I²C-bus I/O pins in high-impedance state when VDDis below 2.0 V.

A PCA9518 cluster cannot be put in series with a PCA9515/16 or with another PCA9518 cluster. Multiple PCA9518 devices can be grouped with other PCA9518 devices into any size cluster thanks to the EXPxxxn pins that allow the I²C-bus signals to be sent/received from/to one PCA9518 to/from another PCA9518 within the cluster. Since there is no direction pin, slightly different 'legal' low voltage levels are used to avoid lock-up conditions between the input and the output of individual repeaters in the cluster. A 'regular LOW' applied at the input of any of the PCA9518 devices will then be propagated as a 'buffered LOW' with a slightly higher LOW value to all enabled outputs in the PCA9518 cluster. When this 'buffered LOW' is applied to a PCA9515 and PCA9516 or separate PCA9518 cluster (not connected via the EXPxxxn pins) in series, the second PCA9515 and PCA9516 or PCA9518 cluster will not recognize it as a 'regular LOW 'and will not propagate it as a 'buffered LOW' again. The PCA9510/9511/9513/9514 and PCA9512 cannot be used in series with the PCA9515 and PCA9516 or PCA9518 either, but can be used in series with themselves since they use shifting instead of static offsets to avoid lock-up conditions. This note is applicable to the 'A' versions of these devices also.

1

Features and benefits

  • Expandable 5 channel, bidirectional buffer
  • I²C-bus and SMBus compatible
  • Active HIGH individual repeater enable inputs
  • Open-drain input/outputs
  • Lock-up free operation
  • Supports arbitration and clock stretching across the repeater
  • Accommodates Standard-mode and Fast-mode I²C-bus devices and multiple masters
  • Powered-off high-impedance I²C-bus pins
  • Operating supply voltage range of 2.3 V to 3.6 V
  • 5 V tolerant I²C-bus and enable pins
  • 0 Hz to 400 kHz clock frequency²
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Package offerings: SO20 and TSSOP20

2. The maximum system operating frequency may be less than 400 kHz because of the delays added by the repeater.

All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: PCA9518AD, PCA9518APW
Block diagram: PCA9518AD, PCA9518APW

Parametrics of this product

Type numberPackageI²C-bus(kHz)InputsOperating
temp.(Cel)		Operating voltage(VDC)Outputs
PCA9518ADSOT163-1
(SO20)		4001-40~852.3~3.6 tolerant to 5.54

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
PCA9518ADPCA9518AD,1189352 842 53118Volume productionSOT163-1
(SO20) 		Tape reel smdStandard Marking

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
PCA9518ADPCA9518AD,1129352 842 53112Discontinued
Replacement product		SOT163-1
(SO20) 		TubeStandard Marking

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9518AD935284253112DN

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9518ADPCA9518AD,118PCA9518ADAlways Pb-free11

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9518ADPCA9518AD,112PCA9518ADAlways Pb-free11
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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9518AD935284253112DN

Documentation for this product

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA9518AD9352 842 53118PCA9518AD,118NAMOUSER ELECTRONICS1,9875/24/2012Buy online 
   NAMOUSER ELECTRONICS1,9875/24/2012Buy online 
   JAPANCHIP ONE STOPyes05/14/2012Buy online 

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