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PCA9512A; PCA9512B: Level shifting hot swappable I²C-bus and SMBus bus buffer

The PCA9512A/B is a hot swappable I²C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corruption of the data and clock buses and includes two dedicated supply voltage pins to provide level shifting between 3.3 V and 5 V systems while maintaining the best noise margin for each voltage level. Either pin may be powered with supply voltages ranging from 2.7 V to 5.5 V with no constraints on which supply voltage is higher. Control circuitry prevents the backplane from being connected to the card until a stop bit or bus idle occurs on the backplane without bus contention on the card. When the connection is made, the PCA9512A/B provides bidirectional buffering, keeping the backplane and card capacitances isolated.

Both the PCA9512A and PCA9512B use identical silicon (PCN201012007F dated 13 Dec 2010), so the PCA9512B will be discontinued in the near future and is not recommended for new designs.

The PCA9512A/B rise time accelerator circuitry allows the use of weaker DC pull-up currents while still meeting rise time requirements. The PCA9512A/B incorporates a digital input pin that enables and disables the rise time accelerators on all four SDAn and SCLn pins.

During insertion, the PCA9512A/B SDAn and SCLn pins are precharged to 1 V to minimize the current required to charge the parasitic capacitance of the chip.

The incremental offset design of the PCA9510A/11A/12A/12B/13A/14A I/O drivers allows them to be connected to another PCA9510A/11A/12A/12B/13A/14A device in series or in parallel and to the I²C compliant side of static offset bus buffers, but not to the static offset side of those bus buffers.

PCA9512A_PCA9512B: Product Block Diagram

PCA9512A_PCA9512B: Block Diagram

sot096-1_3d

Data Sheets (1)

Application Notes (2)

Users Guides (4)

Brochures (3)

Package Information (2)

Packing (2)

Supporting Information (4)

IBIS Model

• PCA9512ADP IBIS model (REV 1.0) ibs PCA9512ADP 9/19/2012

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
PCA9512ADP		SOT505-1	Reflow_Soldering_Profile	Reel 13" Q1/T1	Active	PCA9512ADP,118 (9352 797 19118)	9512A	PCA9512ADP		Always Pb-free	0.0	2.0	5E8	1	1
PCA9512AD		SOT96-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9512AD,118 (9352 797 21118)	PA9512A	PCA9512AD		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9512AD,112 (9352 797 21112)	PA9512A	PCA9512AD		Always Pb-free	0.0	2.0	5E8	1	1