PCA9518

General description

The PCA9518 is a BiCMOS 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 PCA9518 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 PCA9518 parts, any width hub (in multiples of five)¹ can be implemented using the expansion pins.

The PCA9518 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 V_DD is 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 'egal' 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 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, but can be used in series with themselves since they use shifting instead of static offsets to avoid lock-up conditions.

1. Only four ports per device are available if individual Enable is required.

Features

• 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 3.0 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.

Products/packages

Type number	Orderable part number	Ordering code (12NC)	Product status	Package	Packing	Marking	ECCN
PCA9518D	PCA9518D,112	9352 724 04112	Volume production	SOT163	Tube	Standard Marking
PCA9518D	PCA9518D,118	9352 724 04118	Volume production	SOT163	Reel Pack, SMD, 13"	Standard Marking
PCA9518PW	PCA9518PW,112	9352 724 03112	Volume production	SOT360	Tube	Standard Marking
PCA9518PW	PCA9518PW,118	9352 724 03118	Volume production	SOT360	Reel Pack, SMD, 13"	Standard Marking

Quality/reliability/chemical content

Type number	Orderable part number	Chemical content	RoHS	Leadfree Conversion date	RHF	IRF (FIT)	MTBF (hours)	MSL
PCA9518D	PCA9518D,112	PCA9518D		week 4, 2004
PCA9518D	PCA9518D,118	PCA9518D		week 4, 2004
PCA9518PW	PCA9518PW,112	PCA9518PW		week 3, 2005
PCA9518PW	PCA9518PW,118	PCA9518PW		week 3, 2005

Quality and reliability disclaimer

Pricing/ordering/availability

Type number	Ordering code(12NC)	Orderable part number	Indicative price/unit($)	Region	Distributor	In stock	Order quantity	Inventory date	Buy online	Samples
PCA9518D	9352 724 04112	PCA9518D,112	1.5700	NA	DIGI-KEY CORPORATION	179		11/6/2009	Buy online	Order samples
PCA9518D	9352 724 04118	PCA9518D,118	1.5700							not available
PCA9518PW	9352 724 03112	PCA9518PW,112	1.5700	NA	ARROW ELECTRONICS	516		11/6/2009	Buy online	not available
				NA	DIGI-KEY CORPORATION	801		11/6/2009	Buy online
				NA	MOUSER ELECTRONICS	185		11/6/2009	Buy online
PCA9518PW	9352 724 03118	PCA9518PW,118	1.5700							Order samples

Block diagrams/pinning

Design support

Application Notes

Support Documents

Parametrics/similar products

Type number	Package	Operating temp.(Cel)	I²C-bus(kHz)	Operating voltage(VDC)	Inputs	Outputs
PCA9518D	SOT163	-40~85	400	3.0~3.6	1	4
PCA9518PW	SOT360	-40~85	400	3.0~3.6	1	4

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer