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TI extends SMBus multiplexer/switch offering

Posted: 03 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Texas Instruments? TI? SMBus? multiplexer? switch?

Texas Instruments Inc. (TI) unveiled three new 4-bit bidirectional translating (level shifting) I2C and SMBus multiplexers and switches.

Controlled via the I2C bus, the PCA9544A, PCA9545A and PCA9546A support voltage level translation between 2.5-, 3.3- and 5V buses, which is essential in mixed voltage I2C systems. Each upstream channel (SCL/SDA) fans out to four downstream channels where each individual SCn/SDn channel or combination of channels can be selected through the contents of the programmable control register. TI explained that this type of internal architecture allows designers to isolate a section of the I2C bus through I2C software which provides pin savings in the processor. These free pins on the processor can now be used for other functions. In addition, the switches and multiplexers support the standard- and fast-mode speeds.

Of the three new devices, the PCA9545A has the highest feature set. All four channels in this device can be selected at the same time, providing more design flexibility. This device offers an interrupt output and reset input along with a low on-state resistance (Ron=10 ohms), improving signal degradation between the input and output channels.

The PCA9544A, PCA9545A and PCA9546A devices are available in the industry standard 20-pin SSOP, TSSOP, SOIC, and TVSOP packages, as well as QFN and BGA package options. Pricing for the PCA9544ADGVR and PCA9545ADGVR (TVSOP) is set at $2.75, while pricing for the PCA9546ADGVR (TVSOP) is set at $1.74, both in quantities of 1,000.

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Related Datasheets
Part Number Description Category
? PCA9544A 4-Channel I2C and SMBus Multiplexer With Interrupt Logic (Rev. D) Power Supplies, Batteries and Accessories
? PCA9546A 4-Channel I2C and SMBus Switch With Reset Function (Rev. E) Power Supplies, Batteries and Accessories
? PCA9545A PCA9545A (Rev. C) Power Supplies, Batteries and Accessories



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