PCA9545ABS,118 NXP

PCA9545A/45B/45C 2 4-channel I C-bus switch with interrupt logic and reset Rev. 9 5 May 2014 Product data sheet 1. General description The PCA9545A/45B/45C is a quad bidirectional translating switch controlled via the 2 I C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of the four interrupt inputs. An active LOW reset input allows the PCA9545A/45B/45C to recover from a situation 2 where one of the downstream I C-buses is stuck in a LOW state. Pulling the RESET pin 2 LOW resets the I C-bus state machine and causes all the channels to be deselected as does the internal power-on reset function. The pass gates of the switches are constructed such that the V pin can be used to limit DD the maximum high voltage which is passed by the PCA9545A/45B/45C. This allows the use of different bus voltages on each pair, so that 1.8 V or 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. The PCA9545A, PCA9545B and PCA9545C are identical except for the fixed portion of the slave address. 2. Features and benefits 1-of-4 bidirectional translating switches 2 I C-bus interface logic compatible with SMBus standards 4 active LOW interrupt inputs Active LOW interrupt output Active LOW reset input 2 2 address pins allowing up to 4 devices on the I C-bus Alternate address versions A, B and C allow up to a total of 12 devices on the bus for larger systems or to resolve address conflicts 2 Channel selection via I C-bus, in any combination Power-up with all switch 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 VPCA9545A/45B/45C NXP Semiconductors 2 4-channel I C-bus switch with interrupt logic and reset 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 protection exceeds 100 mA per JESD78 Three packages offered: SO20, TSSOP20, and HVQFN20 3. Ordering information Table 1. Ordering information Type number Topside Package marking Name Description Version PCA9545ABS 9545A HVQFN20 plastic thermal enhanced very thin quad flat package SOT662-1 no leads 20 terminals body 5 5 0.85 mm PCA9545AD PCA9545AD SO20 plastic small outline package 20 leads SOT163-1 body width 7.5 mm PCA9545APW PA9545A TSSOP20 plastic thin shrink small outline package 20 leads SOT360-1 body width 4.4 mm PCA9545BPW PA9545B PCA9545CPW PA9545C 3.1 Ordering options Table 2. Ordering options Type number Orderable Package Packing method Minimum Temperature range part number order quantity PCA9545ABS PCA9545ABS,118 HVQFN20 Reel 13 Q1/T1 6000 T = 40 Cto+85 C amb *standard mark SMD PCA9545AD PCA9545AD,112 SO20 Standard marking 1520 T = 40 Cto+85 C amb * ICs tube - DSC bulk pack PCA9545AD,118 SO20 Reel 13 Q1/T1 2000 T = 40 Cto+85 C amb *standard mark SMD PCA9545APW PCA9545APW,112 TSSOP20 Standard marking 1875 T = 40 Cto+85 C amb * ICs tube - DSC bulk pack PCA9545APW,118 TSSOP20 Reel 13 Q1/T1 2500 T = 40 Cto+85 C amb *standard mark SMD PCA9545BPW PCA9545BPW,118 TSSOP20 Reel 13 Q1/T1 2500 T = 40 Cto+85 C amb *standard mark SMD PCA9545CPW PCA9545CPW,118 TSSOP20 Reel 13 Q1/T1 2500 T = 40 Cto+85 C amb *standard mark SMD PCA9545A 45B 45C All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 9 5 May 2014 2 of 32