PCA9545ARGYR
Active4-CHANNEL 2.3- TO 5.5-V I2C/SMBUS SWITCH WITH INTERRUPT, RESET & VOLTAGE TRANSLATION
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PCA9545ARGYR
Active4-CHANNEL 2.3- TO 5.5-V I2C/SMBUS SWITCH WITH INTERRUPT, RESET & VOLTAGE TRANSLATION
Technical Specifications
Parameters and characteristics for this part
| Specification | PCA9545ARGYR |
|---|---|
| Applications | Translating Switch |
| Interface | I2C, SMBus |
| Mounting Type | Surface Mount |
| Package / Case | 20-VFQFN Exposed Pad |
| Supplier Device Package | 20-VQFN (3.5x4.5) |
| Voltage - Supply [Max] | 5.5 V |
| Voltage - Supply [Min] | 2.3 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.49 | |
| 10 | $ 2.23 | |||
| 25 | $ 2.11 | |||
| 100 | $ 1.80 | |||
| 250 | $ 1.69 | |||
| 500 | $ 1.48 | |||
| 1000 | $ 1.22 | |||
| Digi-Reel® | 1 | $ 2.49 | ||
| 10 | $ 2.23 | |||
| 25 | $ 2.11 | |||
| 100 | $ 1.80 | |||
| 250 | $ 1.69 | |||
| 500 | $ 1.48 | |||
| 1000 | $ 1.22 | |||
| Tape & Reel (TR) | 3000 | $ 0.87 | ||
| 6000 | $ 0.84 | |||
| Texas Instruments | LARGE T&R | 1 | $ 1.43 | |
| 100 | $ 1.18 | |||
| 250 | $ 0.85 | |||
| 1000 | $ 0.64 | |||
Description
General part information
PCA9545A Series
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. PullingRESETlow 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.
Documents
Technical documentation and resources
