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See Technical Specifications

PCA9545APWR +BOM

4-channel 2.3- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation

Manufacturer:

TI
Mfr.Part #:

PCA9545APWR
Datasheet:

PCA9545APWR Datasheet (PDF)
Addresses:

4
Supply voltage (max) (V):

5.5
Supply voltage (min) (V):

2.3
Features:

Interrupt pin, Reset pin
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PCA9545APWR General Description

The PCA9545A is a quad bidirectional translating switch controlled via the I²C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs ( INT3– INT0), one for each of the downstream pairs, are provided. One interrupt ( INT) output acts as an AND of the four interrupt inputs.

An active-low reset ( RESET) input allows the PCA9545A to recover from a situation in which one of the downstream I²C buses is stuck in a low state. Pulling RESET low resets the I²C 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 VCC terminal can be used to limit the maximum high voltage, which will be passed by the PCA9545A. 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 terminals are 5.5 V tolerant.

Key Features

1-of-4 Bidirectional Translating Switches
I²C Bus and SMBus Compatible
Four Active-Low Interrupt Inputs
Active-Low Interrupt Output
Active-Low Reset Input
Two Address Terminals, Allowing up to Four Devices on the I²C Bus
Channel Selection via I²C Bus, in Any Combination
Power-Up With All Switch Channels Deselected
Low R_ON Switches
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
5.5 V Tolerant Inputs
0 to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100 mA per JESD 78
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

Specifications

Addresses	4	Supply voltage (max) (V)	5.5
Supply voltage (min) (V)	2.3	Features	Interrupt pin, Reset pin
Rating	Catalog	Frequency (max) (MHz)	0.4
Operating temperature range (°C)	-40 to 85	Number of channels	4