• 简体中文
• English

PCA9306: Dual bidirectional I2C-bus and SMBus voltage-level translator

The PCA9306 is a dual bidirectional I²C-bus and SMBus voltage-level translator with an enable (EN) input, and is operational from 1.0 V to 3.6 V (Vref(1)) and 1.8 V to 5.5 V (Vbias(ref)(2)).

The PCA9306 allows bidirectional voltage translations between 1.0 V and 5 V without the use of a direction pin. The low ON-state resistance (Ron) of the switch allows connections to be made with minimal propagation delay. When EN is HIGH, the translator switch is on, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports.

The PCA9306 is not a bus buffer like the PCA9509 or PCA9517A that provide both level translation and physically isolates the capacitance to either side of the bus when both sides are connected. The PCA9306 only isolates both sides when the device is disabled and provides voltage level translation when active.

The PCA9306 can also be used to run two buses, one at 400 kHz operating frequency and the other at 100 kHz operating frequency. If the two buses are operating at different frequencies, the 100 kHz bus must be isolated when the 400 kHz operation of the other bus is required. If the master is running at 400 kHz, the maximum system operating frequency may be less than 400 kHz because of the delays added by the translator.

As with the standard I²C-bus system, pull-up resistors are required to provide the logic HIGH levels on the translator’s bus. The PCA9306 has a standard open-collector configuration of the I²C-bus. The size of these pull-up resistors depends on the system, but each side of the translator must have a pull-up resistor. The device is designed to work with Standard-mode, Fast-mode and Fast-mode Plus I²C-bus devices in addition to SMBus devices. The maximum frequency is dependent on the RC time constant, but generally supports > 2 MHz.

When the SDA1 or SDA2 port is LOW, the clamp is in the ON-state and a low resistance connection exists between the SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port when the SDA2 port is HIGH, the voltage on the SDA1 port is limited to the voltage set by VREF1. When the SDA1 port is HIGH, the SDA2 port is pulled to the drain pull-up supply voltage (Vpu(D)) by the pull-up resistors. This functionality allows a seamless translation between higher and lower voltages selected by the user without the need for directional control. The SCL1/SCL2 channel also functions as the SDA1/SDA2 channel.

All channels have the same electrical characteristics and there is minimal deviation from one output to another in voltage or propagation delay. This is a benefit over discrete transistor voltage translation solutions, since the fabrication of the switch is symmetrical. The translator provides excellent ESD protection to lower voltage devices, and at the same time protects less ESD-resistant devices.

PCA9306: Product Block Diagram

Outline 3d SOT765-1

Data Sheets (1)

Application Notes (5)

Users Guides (3)

Brochures (1)

Package Information (7)

Packing (7)

Reports or Presentations (1)

Supporting Information (5)

IBIS Model

• PCA9306 IBIS model (REV 1.0) ZIP PCA9306_1 8/19/2014

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
PCA9306GM		SOT902-2		Reel 7" Q3/T4, Reverse	Active	PCA9306GM,125 (9352 831 23125)	Standard Marking	PCA9306GM		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306DC1		SOT765-1		Reel 7" Q3/T4, Reverse	Active	PCA9306DC1,125 (9352 831 24125)	P06	PCA9306DC1		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306DC1/DG		SOT765-1		Reel 7" Q3/T4, Reverse	Active	PCA9306DC1/DG,125 (9352 965 24125)	P06	PCA9306DC1/DG		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306DC		SOT765-1		Reel 7" Q3/T4, Reverse	Active	PCA9306DC,125 (9352 831 21125)	306C	PCA9306DC		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306DP1		SOT505-2		Reel 7" Q3/T4, Reverse	Active	PCA9306DP1,125 (9352 831 22125)	306T	PCA9306DP1		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306DP		SOT505-1	Reflow_Soldering_Profile	Reel 13" Q1/T1	Active	PCA9306DP,118 (9352 831 18118)	306P	PCA9306DP		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306D		SOT96-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9306D,118 (9352 831 19118)	PCA9306	PCA9306D		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9306D,112 (9352 831 19112)	PCA9306	PCA9306D		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306GD1		SOT996-2		Reel 7" Q3/T4, Reverse	Active	PCA9306GD1,125 (9352 908 55125)	P06	PCA9306GD1		Always Pb-free	0.0	2.0	5E8	1	1
PCA9306GF		SOT1089		Reel 7" Q1/T1	Active	PCA9306GF,115 (9352 911 05115)	6	PCA9306GF		Always Pb-free	0.0	2.0	5E8	1	1