PCA9518

General description

The PCA9518 is a BiCMOS integrated circuit intended for application in I²C and SMBus systems.

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

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 EXPxxxx pins that allow the I2C 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 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 EXPxxx 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, bi-directional 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 devices and multiple masters
• Powered-off high-impedance I²C pins
• Operating supply voltage range of 3.0 V to 3.6 V
• 5 V tolerant I²C and enable pins
• 0 kHz to 400 kHz clock frequency ²
• 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: SO and TSSOP

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

Products/packages

Type number	North American Type number	Ordering code (12NC)	Product status	Package	Packing	Marking	Chemical content	Leadfree conversion date
PCA9518D	PCA9518D	9352 724 04112	Volume production	SOT163-1 (SO20)	Tube	Standard Marking	PCA9518D	week 4, 2004
PCA9518D	PCA9518D-T	9352 724 04118	Volume production	SOT163-1 (SO20)	Tape reel smd	Standard Marking	PCA9518D	week 4, 2004
PCA9518PW	PCA9518PW	9352 724 03112	Volume production	SOT360-1 (TSSOP20)	Tube	Standard Marking	PCA9518PW	week 3, 2005
PCA9518PW	PCA9518PW-T	9352 724 03118	Volume production	SOT360-1 (TSSOP20)	Reel Pack, SMD, 13"	Standard Marking	PCA9518PW	week 3, 2005

Pricing/ordering/availability

Type number	Ordering code(12NC)	Indicative price/unit($)	Region	Distributor	In stock	Inventory date	Buy online	Samples
PCA9518D	9352 724  04112	1.5700	NA	DIGI-KEY CORPORATION	684	6/29/2008	Buy online	Order samples
PCA9518D	9352 724  04118	1.5700						not available
PCA9518PW	9352 724  03112	1.5700	NA	MOUSER ELECTRONICS	3,750	7/6/2008	Buy online	not available
			NA	DIGI-KEY CORPORATION	1,017	6/29/2008	Buy online
			NA	ARROW ELECTRONICS	37	7/4/2008	Buy online
PCA9518PW	9352 724  03118	1.5700						Order samples

Applications

Related applications
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PDA - discretes focus
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50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
LCD TV - MMS functionality

Block diagrams/pinning

Technical documents

Application Notes

Support Documents

Parametrics/similar products

Type number	Package	Operating temp.(Cel)	I²C-bus(kHz)	Operating voltage(VDC)	Inputs	Outputs
PCA9518D	SOT163-1 (SO20)	-40~85	400	3.0~3.6	1	4
PCA9518PW	SOT360-1 (TSSOP20)	-40~85	400	3.0~3.6	1	4

Similar products

PCA9518 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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