PCA9547 2 8-channel I C-bus multiplexer with reset Rev. 03 10 July 2009 Product data sheet 1. General description 2 The PCA9547 is an octal bidirectional translating multiplexer controlled by the I C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Only one SCx/SDx channel can be selected at a time, determined by the contents of the programmable control register. The device powers up with Channel 0 connected, allowing immediate communication between the master and downstream devices on that channel. An active LOW reset input allows the PCA9547 to recover from a situation where one of 2 the downstream I C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the 2 I C-bus state machine causing all the channels to be deselected, except Channel 0 so that the master can regain control of the bus. The pass gates of the multiplexers are constructed such that the V pin can be used to DD limit the maximum high voltage which will be passed by the PCA9547. This allows the use of different bus voltages on each 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. 2. Features n 1-of-8 bidirectional translating multiplexer 2 n I C-bus interface logic compatible with SMBus standards n Active LOW RESET input 2 n 3 address pins allowing up to 8 devices on the I C-bus 2 n Channel selection via I C-bus, one channel at a time n Power-up with all channels deselected except Channel 0 which is connected n Low R multiplexers on n Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses n No glitch on power-up n Supports hot insertion n Low standby current n Operating power supply voltage range of 2.3 V to 5.5 V n 5 V tolerant inputs n 0 Hz to 400 kHz clock frequency n ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101 n Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA n Packages offered: SO24, TSSOP24, HVQFN24PCA9547 NXP Semiconductors 2 8-channel I C-bus multiplexer with reset 3. Ordering information Table 1. Ordering information Type number Package Name Description Version PCA9547D SO24 plastic small outline package 24 leads SOT137-1 body width 7.5 mm PCA9547PW TSSOP24 plastic thin shrink small outline package 24 leads SOT355-1 body width 4.4 mm PCA9547BS HVQFN24 plastic thermal enhanced very thin quad at package SOT616-1 no leads 24 terminals body 4 4 0.85 mm 3.1 Ordering options Table 2. Ordering options Type number Topside mark Temperature range PCA9547D PCA9547D T = - 40 C to +85 C amb PCA9547PW PCA9547 T = - 40 C to +85 C amb PCA9547BS 9547 T = - 40 C to +85 C amb PCA9547 3 NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 10 July 2009 2 of 26