Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: PCA9544A, PCA9545A and PCA9546A
Edited by the Electronicstalk Editorial
Team on 20 February 2006
Multiplexers and switches go both ways
Three new 4bit bidirectional translating I2C and SMBus multiplexers and switches support voltage level translation between 2.5, 3.3 and 5V buses.
Texas Instruments has released three new 4bit bidirectional translating (level-shifting) I2C and SMBus multiplexers and switches 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
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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As the popular I2C two-wire communication bus standard continues to be adopted in many system applications, including computing and portable electronics, it is important to have I2C- and SMBus-compatible multiplexers and switches that can support the mixed voltage I2C systems.
Controlled via the I2C bus, TI's new four-channel bidirectional switches support voltage interface between 2.5, 3.3 and 5V buses.
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.
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.
These I2C switches and multiplexers can also be used to resolve I2C address conflicts.
These devices also support standard- and fast-mode speeds.
Of these three devices, the PCA9545A has the highest feature set.
All four channels in this device can be selected at the same time, providing for more design flexibility.
This device offers an interrupt output and reset input along with a low on-state resistance (10ohm), improving signal degradation between the input and output channels.
All three devices are useful for a range of applications, including system monitoring in both telecomms and computing.
All three devices are available now with free samples support.
The PCA9544A, PCA9545A and PCA9546A are available in the industry standard 20-pin SSOP, TSSOP, SOIC and TVSOP packages along with the space-saving quad flatpack (QFN) and ball grid array (BGA) package options.
Budgetary pricing for the PCA9544ADGVR and PCA9545ADGVR (TVSOP) is set at $2.75 in quantities of 1000.
Budgetary pricing for the PCA9546ADGVR (TVSOP) is set at $1.74 in quantities of 1000.
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