Overview
The PCA9547D,118 is an 8-channel I²C-bus multiplexer with reset, manufactured by NXP USA Inc. This device is an octal bidirectional translating multiplexer controlled by the I²C-bus, allowing the SCL/SDA upstream pair to fan out to eight downstream pairs or channels. Only one channel can be selected at a time, determined by the contents of the programmable control register. The PCA9547 powers up with Channel 0 connected, enabling immediate communication between the master and downstream devices on that channel. An active LOW reset input is available to recover from bus fault conditions where a downstream I²C-bus is stuck in a LOW state.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SO24, TSSOP24, HVQFN24 |
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| Voltage Level Translation | Between 1.8 V, 2.5 V, 3.3 V, and 5 V buses |
| Input Tolerance | 5 V tolerant inputs |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
| Temperature Range | -40°C to +85°C |
| Reset Input | Active LOW |
Key Features
- 1-of-8 bidirectional translating multiplexer
- I²C-bus interface logic compatible with SMBus standards
- Active LOW RESET input for recovering from bus fault conditions
- Three address pins allowing up to 8 devices on the I²C-bus
- Channel selection via I²C-bus, one channel at a time
- Power-up with all channels deselected except Channel 0
- No glitch on power-up
- Supports hot insertion
- Low standby current
Applications
The PCA9547D,118 is suitable for various applications requiring I²C-bus multiplexing and voltage level translation. These include:
- Embedded systems where multiple I²C devices need to be connected to a single master
- Industrial automation for managing multiple sensors and actuators
- Automotive systems for integrating various I²C-based components
- Consumer electronics for simplifying I²C bus management
- Medical devices requiring reliable and flexible I²C communication
Q & A
- What is the PCA9547D,118 used for?
The PCA9547D,118 is an 8-channel I²C-bus multiplexer with reset, used to manage and switch between multiple I²C devices connected to a single master. - What are the available package types for the PCA9547D,118?
The PCA9547D,118 is available in SO24, TSSOP24, and HVQFN24 packages. - What is the operating power supply voltage range for the PCA9547D,118?
The operating power supply voltage range is from 2.3 V to 5.5 V. - Can the PCA9547D,118 perform voltage level translation?
Yes, it can translate between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. - What is the purpose of the RESET input on the PCA9547D,118?
The RESET input is an active LOW signal used to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. - Is the PCA9547D,118 compatible with SMBus standards?
Yes, the PCA9547D,118 is compatible with SMBus standards. - What is the clock frequency range supported by the PCA9547D,118?
The clock frequency range is from 0 Hz to 400 kHz. - Does the PCA9547D,118 support hot insertion?
Yes, it supports hot insertion. - What is the ESD protection level of the PCA9547D,118?
The ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101. - What is the temperature range for the PCA9547D,118?
The temperature range is from -40°C to +85°C.
