PCA9544A

General description

The PCA9544A is a 1-of-4 bi-directional translating multiplexer, controlled via the I²C-bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the four interrupt inputs, is provided.

A power-on reset function puts the registers in their default state and initializes the I²C state machine with no channels selected.

The pass gates of the multiplexer are constructed such that the V_DD pin can be used to limit the maximum high voltage which will be passed by the PCA9544A. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.8 V, 2.5 V or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

Features

• 1-of-4 bi-directional translating multiplexer
• I²C interface logic; compatible with SMBus
• 4 Active-LOW Interrupt Inputs
• Active-LOW Interrupt Output
• 3 address pins allowing up to 8 devices on the I²C-bus
• Channel selection via I²C-bus
• Power-up with all multiplexer channels deselected
• Low Rds_ON switches
• Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
• No glitch on power-up
• Supports hot insertion
• Low stand-by current
• Operating power supply voltage range of 2.3 V to 5.5 V
• 5 V tolerant Inputs
• 0 to 400 kHz clock frequency
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V per JESD22-C101
• Latchup testing is done to JESDEC Standard JESD78 which exceeds 100 mA
• Three packages offered: SO20, TSSOP20, and HVQFN20

Products/packages

Pricing/ordering/availability

Applications

Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine

Block diagrams/pinning

Technical documents

Application Notes

AN10441_1; Level shifting techniques in I2C-bus design (20-Jun-07)

AN262_2; PCA954X FAMILY OF IC / SMBus MULTIPLEXERS and SWITCHES (01-Oct-04)

Support Documents

75013239; I 2 C Logic Selection Guide (2005-01-12)

75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)

75012744; I2C Bus Solutions 2004 (2004-02-01)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (13-Jun-06)

philips_i2c_handbook; I2C Handbook (2004-01-01)

UM10204_3; I2C-bus specification and user manual (26-Jun-07)

philips_i2c_logic_overview; Interface Products Business Line Specialty Logic Product Line I2C Logic Family Overview (2004-01-01)

75016529; NXP 2-, 4-, and 8-channel I (2008-07-01)

75016189; NXP I (2008-06-01)

75012801; PCA954x family 2-,4-,and 8-channel I 2 C/SMBus muxes and switches (2004-10-18)

75015669; Your complete choice for I2C-bus peripherals (01-Dec-07)

75014395; Your connection to I 2 C,UART,CAN,and USB Connecting with Philips Wired Connectivity (2005-04-01)

Parametrics/similar products

Similar products

PCA9544A 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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