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PCA9545A-PCA9545ADW-PCA9545ADWR-PCA9545APWR-PCA9545APW-T-PCA9545ARGYR-PCA9545AZQNR
4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-TSSOP -40 to 85
SCL
PCA9545A,A...A01N
Slaves B0, B...B
I2C or SMBus
Master
(e.g. µProcessor)
SDA
INT
RESET SD1SC1
INT1
VCC
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PCA9545ASCPS147D –OCTOBER 2005–REVISED JUNE 2014
PCA9545A Low Voltage 4-channelI2C and SMbus Switch With Interrupt Logic and Reset
Functions Features 2 Applications 1-of-4 Bidirectional Translating Switches • ServersI2C Bus and SMBus Compatible • Routers (Telecom Switching Equipment) Four Active-Low Interrupt Inputs • Factory Automation Active-Low Interrupt Output • Products WithI2C Slave Address Conflicts (e.g.
Multiple, Identical Temp Sensors)• Active-Low Reset Input Two Address Terminals, Allowingupto Four
3 DescriptionDeviceson theI2C Bus The PCA9545Aisa quad bidirectional translating• Channel Selection viaI2C Bus,in Any switch controlled via theI2C bus. The SCL/SDACombination upstream pair fans outto four downstream pairs,or• Power-Up WithAll Switch Channels Deselected channels. Any individual SCn/SDn channel or
combinationof channels can be selected, determined• Low RON Switches by the contentsof the programmable control register.• Allows Voltage-Level Translation Between 1.8-V, Four interrupt inputs (INT3–INT0), onefor eachof the2.5-V, 3.3-V, and 5-V Buses downstream pairs, are provided. One interrupt (INT)• No Glitchon Power-Up output actsasan ANDof the four interrupt inputs. Supports Hot Insertion An active-low reset (RESET) input allows the• Low Standby Current PCA9545Ato recover froma situationin which oneof
the downstreamI2C busesis stuckina low state.• Operating Power-Supply Voltage Rangeof Pulling RESET low resets theI2C state machine and2.3Vto 5.5V causesall the channelsto be deselected,as does the• 5.5V Tolerant Inputs internal power-on reset function.• 0to 400-kHz Clock Frequency The pass gatesof the switches are constructed such• Latch-Up Performance Exceeds 100 mA per that the VCC terminal can be used to limit theJESD78 maximum high voltage, which will be passed by the ESD Protection Exceeds JESD22 PCA9545A. This allows the use of different bus
voltages on each pair, so that 1.8-V, 2.5-V,or 3.3-V– 2000-V Human-Body Model (A114-A) parts can communicate with 5-V parts, without any– 1000-V Charged-Device Model (C101) additional protection. External pull-up resistors pull
the bus up to the desired voltage level for each
channel.All I/O terminals are 5.5V tolerant.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Diagram
