Overview
The PCA9544ARGYR, produced by Texas Instruments, is a 4-channel, bidirectional translating multiplexer designed for I2C and SMBus applications. This device allows for the expansion of the I2C bus by providing four downstream channels from a single upstream channel. It is particularly useful in scenarios where multiple devices share the same I2C address or where voltage-level translation between different bus voltages is necessary. The PCA9544ARGYR supports a wide operating voltage range of 2.3 V to 5.5 V and is compatible with various package types, including VQFN (20 pins).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | 2.3 | - | 5.5 | V |
| Operating Free-Air Temperature Range | -40 | - | 85 | °C |
| I2C Clock Frequency | 0 | - | 400 | kHz |
| Switch-On Resistance (at 5 V) | 4 | - | 10 | Ω |
| Power-On Reset Voltage (VCC Rising) | 1.2 | 1.5 | - | V |
| ESD Protection (Human-Body Model) | - | - | 2000 | V |
Key Features
- 1-of-4 bidirectional translating switches for I2C and SMBus compatibility
- Four active-low interrupt inputs and one active-low interrupt output
- Three address pins allowing up to eight devices on the I2C bus
- Channel selection via I2C bus
- Power up with all switch channels deselected
- Low RON switches for minimal voltage drop
- Voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power up and supports hot insertion
- Low standby current and 5.5-V tolerant inputs
- ESD protection exceeding JESD 22 standards
Applications
- Servers and data centers
- Telecom switching equipment and routers
- Factory automation systems
- Products with I2C slave address conflicts, such as multiple identical temperature sensors
Q & A
- What is the PCA9544ARGYR used for?
The PCA9544ARGYR is used as a 4-channel, bidirectional translating multiplexer for I2C and SMBus applications, allowing expansion of the I2C bus and voltage-level translation between different bus voltages.
- What is the operating voltage range of the PCA9544ARGYR?
The operating voltage range is from 2.3 V to 5.5 V.
- How many channels does the PCA9544ARGYR support?
The device supports four downstream channels from a single upstream channel.
- What types of packages are available for the PCA9544ARGYR?
The device is available in TVSOP, SOIC, TSSOP, and VQFN (20 pins) packages.
- Does the PCA9544ARGYR support hot insertion?
- What is the maximum I2C clock frequency supported by the PCA9544ARGYR?
The maximum I2C clock frequency is 400 kHz.
- How many address pins does the PCA9544ARGYR have?
The device has three address pins, allowing up to eight devices on the I2C bus.
- What is the purpose of the interrupt inputs and output on the PCA9544ARGYR?
The four active-low interrupt inputs (INT3–INT0) and one active-low interrupt output (INT) are used to signal events from the downstream channels.
- Does the PCA9544ARGYR have ESD protection?
- What are some common applications of the PCA9544ARGYR?
