Overview
The PCA9514AD, produced by NXP USA Inc., is a hot swappable I2C-bus and SMBus bus buffer designed to facilitate the insertion and removal of I/O cards into a live backplane without disrupting the data and clock buses. This component is particularly useful in systems that require continuous operation, such as those found in cPCI, VME, and AdvancedTCA environments. The PCA9514AD ensures that the backplane and card capacitances are isolated, preventing bus contention and data corruption during hot swapping operations.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SO8 (Small Outline Package), TSSOP8 (Thin Shrink Small Outline Package) |
| Number of Leads | 8 |
| Lead Pitch | 1.27 mm |
| Package Dimensions | 4.9 mm x 3.9 mm x 1.75 mm |
| Operating Power Supply Voltage | 2.7 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, and 1000 V CDM |
| Latch-up Testing | Exceeds 100 mA (JEDEC Standard JESD78) |
| Current Source on SCLIN and SDAIN | Not applicable (available on PCA9513A only) |
| Rise Time Accelerator Circuitry | Yes, with hardware disable pin for lightly loaded systems |
| READY Output Pin | Open-drain output indicating connection status |
| Digital ENABLE Input Pin | Enables device when asserted HIGH, forces low current mode when asserted LOW |
Key Features
- Hot swappable I2C-bus and SMBus bus buffer, allowing I/O card insertion into a live backplane without data corruption
- Bidirectional buffering, isolating backplane and card capacitances
- Rise time accelerator circuitry to meet rise time requirements with weaker DC pull-up currents
- Supports clock stretching and multiple master arbitration and synchronization
- Digital ENABLE input pin and open-drain READY output pin for control and status indication
- High-impedance SDA and SCL pins for VCC = 0 V
Applications
The PCA9514AD is primarily used in applications requiring hot swappable I/O cards, such as:
- cPCI (CompactPCI) cards
- VME (VersaModule Eurocard) cards
- AdvancedTCA (Advanced Telecommunications Computing Architecture) cards
- Multipoint backplane cards in operating systems
Q & A
- What is the primary function of the PCA9514AD?
The PCA9514AD is a hot swappable I2C-bus and SMBus bus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. - What are the package options for the PCA9514AD?
The PCA9514AD is available in SO8 and TSSOP8 packages. - What is the operating voltage range for the PCA9514AD?
The operating power supply voltage range is 2.7 V to 5.5 V. - What is the clock frequency range supported by the PCA9514AD?
The clock frequency range is 0 Hz to 400 kHz. - Does the PCA9514AD have ESD protection?
Yes, it exceeds 2000 V HBM, 200 V MM, and 1000 V CDM. - What is the purpose of the READY output pin?
The READY output pin is an open-drain output that indicates whether the backplane and card sides are connected together. - How does the digital ENABLE input pin function?
The digital ENABLE input pin enables the device when asserted HIGH and forces the device into a low current mode when asserted LOW. - What types of systems typically use the PCA9514AD?
The PCA9514AD is used in cPCI, VME, and AdvancedTCA systems. - Does the PCA9514AD support clock stretching and multiple master arbitration?
Yes, it supports clock stretching and multiple master arbitration and synchronization. - What is the purpose of the rise time accelerator circuitry?
The rise time accelerator circuitry allows the use of weaker DC pull-up currents while still meeting rise time requirements.
