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PCA9540B Datasheet(PDF) 2 Page - NXP Semiconductors |
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PCA9540B Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 14 page Philips Semiconductors Product data sheet PCA9540B 2-channel I2C multiplexer 2 2004 Sep 29 FEATURES • 1-of-2 bi-directional translating multiplexer • I2C interface logic; compatible with SMBus standards • 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 • Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA • Packages Offered: SO8, TSSOP8 DESCRIPTION The PCA9540B is a 1-of-2 bi-directional translating multiplexer, controlled via the I2C-bus. The SCL/SDA upstream pair fans out to two 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. 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 VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9540B. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.8 V, 2.5, or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors can pull the bus up to the desired voltage level for this channel. All I/O pins are 5 V tolerant. The PCA9540B has replaced the PCA9540 and all designs must migrate to the PCA9540B. PCA9540B samples can be requested from www.philipslogic.com/products/I2Cmuxes/. PIN CONFIGURATION 1 2 3 45 6 7 8 SCL SDA VDD SD0 SC1 SD1 SC0 VSS SW00491 Figure 1. Pin configuration PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 1 SCL Serial clock line 2 SDA Serial data line 3 VDD Supply voltage 4 SD0 Serial data 0 5 SC0 Serial clock 0 6 VSS Supply ground 7 SD1 Serial data 1 8 SC1 Serial clock 1 ORDERING INFORMATION PACKAGES TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DRAWING NUMBER 8-Pin Plastic SO –40 °C to +85 °C PCA9540BD PA9540B SOT96-1 8-Pin Plastic TSSOP –40 °C to +85 °C PCA9540BDP 9540B SOT505-1 Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging. |
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