Product Summary

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/.

Parametrics

ABSOLUTE MAXIMUM RATINGS:
(1)DC supply voltage:-0.5 to +7.0 V; (2)DC input voltage:-0.5 to +7.0 V; (3)DC input current:±20 mA; (4)DC output current: ±25 mA; (5)Supply current :±100 mA; (6)Supply current :±100 mA; (7)total power dissipation: 400 mW; (8)Storage temperature range: -60 to +150℃; (9)Operating ambient temperature: -40 to +85 ℃

Features

(1)1-of-2 bi-directional translating multiplexer; (2)I2C interface logic; compatible with SMBus standards; (3)Channel selection via I2C-bus; (4)Power up with all multiplexer channels deselected; (5)Low RdsON switches; (6)Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses; (7)No glitch on power-up; (8)Supports hot insertion; (9)Low stand-by current; (10)Operating power supply voltage range of 2.3 V to 5.5 V; (11)5 V tolerant Inputs; (12)0 to 400 kHz clock frequency; (13)ESD protection exceeds 2000 V HBM per JESD22-A114,200 V MM per JESD22-A115 and 1000 V per JESD22-C101; (14)Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA; (15)Packages Offered: SO8, TSSOP8

Diagrams

<IMG border=0 src="http://www.seekic.com/uploadfile/ic-mfg/201272315440460.jpg">

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
PCA9540BDP,118
PCA9540BDP,118

NXP Semiconductors

Encoders, Decoders, Multiplexers & Demultiplexers I2C MUX 2CH

Data Sheet

0-1: $0.47
1-25: $0.43
25-100: $0.40
100-250: $0.38
PCA9540BDP/DG,118
PCA9540BDP/DG,118

NXP Semiconductors

Buffers & Line Drivers 2-CH I2C MUX DK GR

Data Sheet

0-1: $0.47
1-25: $0.43
25-100: $0.40
100-250: $0.38