PCA9540B 2 2-channel I C-bus multiplexer Rev. 5 12 February 2013 Product data sheet 1. General description 2 The PCA9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the I C-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. 2 A power-on reset function puts the registers in their default state and initializes the I C-bus state machine with no channels selected. The pass gates of the multiplexer are constructed such that the V pin can be used to DD limit the maximum high voltage that 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 V 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. 2. Features and benefits 1-of-2 bidirectional translating multiplexer 2 I C-bus interface logic compatible with SMBus standards 2 Channel selection via I C-bus Power up with all multiplexer channels deselected Low R switches on 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 standby current Operating power supply voltage range of 2.3 V to 5.5 V 5 V tolerant inputs 0 Hz to 400 kHz clock frequency ESD protection exceeds 2000 V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA Packages offered: SO8, TSSOP8, XSON8UPCA9540B NXP Semiconductors 2 2-channel I C-bus multiplexer 3. Ordering information Table 1. Ordering information Type number Topside Package marking Name Description Version PCA9540BD PA9540B SO8 plastic small outline package 8 leads body width 3.9 mm SOT96-1 PCA9540BDP 9540B TSSOP8 plastic thin shrink small outline package 8 leads body width 3 mm SOT505-1 PCA9540BGD 40B XSON8U plastic extremely thin small outline package no leads 8 terminals SOT996-2 UTLP based body 3 2 0.5 mm 3.1 Ordering options Table 2. Ordering options Type number Orderable Package Packing method Minimum Temperature range part number order quantity PCA9540BD PCA9540BD,112 SO8 Tube, bulk pack 2000 T = 40 C to +85 C amb PCA9540BD,118 SO8 Reel pack, SMD, 13-inch 2500 T = 40 C to +85 C amb PCA9540BDP PCA9540BDP,118 TSSOP8 Reel pack, SMD, 13-inch 2500 T = 40 C to +85 C amb PCA9540BDP/DG,118 TSSOP8 Reel pack, SMD, 13-inch 2500 T = 40 C to +85 C amb PCA9540BGD PCA9540BGD,125 XSON8U Reel pack, reverse 3000 T = 40 C to +85 C amb 4. Block diagram PCA9540B SD0 SD1 SC0 SC1 V SWITCH CONTROL LOGIC SS POWER-ON V DD RESET SCL INPUT 2 I C-BUS FILTER SDA CONTROL 002aae715 Fig 1. Block diagram of PCA9540B PCA9540B All information provided in this document is subject to legal disclaimers. NXP B.V. 2013. All rights reserved. Product data sheet Rev. 5 12 February 2013 2 of 26