Overview
The PCA9508DP,118 is a CMOS integrated circuit designed by NXP USA Inc. as a hot-swappable level translating I2C-bus repeater. This device is particularly useful in systems that require voltage level translation and capacitance isolation between two I2C-bus segments. It supports hot-swap operations with zero offset, making it ideal for applications where I/O cards need to be inserted into a live backplane without disrupting the data and clock buses.
Key Specifications
| Parameter | Description |
|---|---|
| Voltage Range (VCC(A)) | 0.9 V to 5.5 V |
| Voltage Range (VCC(B)) | 2.7 V to 5.5 V |
| Frequency | Up to 400 kHz |
| Package Type | 8-TSSOP |
| Pin Count | 8 |
| Supply Ground | 0 V |
| Enable Pin | Active HIGH with internal pull-up (100 kΩ) |
| Capacitance | Up to 400 pF on either side of the device |
Key Features
- Hot-swappable with zero offset, allowing I/O cards to be inserted into a live backplane without corrupting the data and clock buses.
- Voltage level translation between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) for I2C-bus or SMBus applications.
- Bidirectional buffering for both data (SDA) and clock (SCL) lines, enabling the extension of the I2C-bus.
- Isolation of two halves of a bus for both voltage and capacitance.
- Dual supply pins can be powered up in any sequence; when any of the supply pins are unpowered, the 5 V tolerant I/O are high-impedance.
- Undervoltage/initialization circuit holds the PCA9508 in a disconnected state during power-up.
Applications
- I2C-bus or SMBus systems requiring voltage level translation and capacitance isolation.
- Hot-swappable I/O cards in live backplanes.
- Industrial control systems.
- Automotive systems where robust and reliable communication is necessary.
- Embedded systems requiring flexible and reliable I2C-bus communication.
Q & A
- What is the primary function of the PCA9508DP,118?
The PCA9508DP,118 is a hot-swappable level translating I2C-bus repeater that provides voltage level translation and capacitance isolation between two I2C-bus segments. - What are the voltage ranges supported by the PCA9508DP,118?
The device supports voltage ranges from 0.9 V to 5.5 V for VCC(A) and from 2.7 V to 5.5 V for VCC(B). - What is the maximum frequency supported by the PCA9508DP,118?
The device supports frequencies up to 400 kHz. - What type of package does the PCA9508DP,118 come in?
The PCA9508DP,118 comes in an 8-TSSOP package. - How does the PCA9508DP,118 handle hot-swapping?
The PCA9508DP,118 supports hot-swap operations with zero offset, allowing I/O cards to be inserted into a live backplane without disrupting the data and clock buses. - What is the purpose of the enable pin (EN) on the PCA9508DP,118?
The enable pin (EN) is an active HIGH input with an internal pull-up (100 kΩ) that forces the device into a disconnected state when LOW and allows it to enter the initialization state when HIGH. - Can the supply pins of the PCA9508DP,118 be powered up in any sequence?
Yes, the dual supply pins can be powered up in any sequence, and when any of the supply pins are unpowered, the 5 V tolerant I/O are high-impedance. - How does the PCA9508DP,118 handle undervoltage conditions during power-up?
The device has an undervoltage/initialization circuit that holds it in a disconnected state during power-up. - What is the maximum capacitance supported by the PCA9508DP,118 on either side of the device?
The device supports up to 400 pF on either side of the device. - In what types of systems is the PCA9508DP,118 typically used?
The PCA9508DP,118 is typically used in I2C-bus or SMBus systems, hot-swappable I/O cards, industrial control systems, automotive systems, and embedded systems requiring flexible and reliable I2C-bus communication.
