Compact PCI Backplane Interface 28-Pin TSSOP T/R

The CMCPCI102BT/BR is a 10-channel backplane interface/termination IC specifically designed for CompactPCI redundant system-slot cards. The CMCPCI102BT/BR allows CompactPCI boards to interface to the backplane and provides the versatility to use system cards in any slot (system or peripheral). Per the CompactPCI specification, the CMCPCI102BT/ BR provides a 10? termination resistor for each channel to terminate the transmission line stub on the board. An integral series switch and ass Deg Ciated control signal (SW_EN) permits connection/disconnection of the channel, so that the device side of the circuit may be isolated from the backplane side. The CompactPCI standard requires system boards to be hot-swappable. To accommodate this requirement, the CMCPCI102BT/BR features a switched 10k? resistor connected to the 1V Precharge Supply Voltage. If the precharge enable pin (P_EN) is asserted, then the 10k? pull-up resistors are connected to precharge the circuits. In addition, a system board requirement mandates either a 1.0k? pull-up resistor or a 2.7k? resistor connected to VIO. CompactPCI slot cards must work in either 3.3V or 5V systems, hence the need for both 2.7k? and 1k? resistors. If the 3_EN pin is logic high, the 2.7k? resistor is used as the pull-up. If the 5_EN pin is logic high, the 1k? resistor is used. The CMCPCI102BT/BR integrates all these functions in a low-profile 28-pin TSSOP package and is available with optional lead-free finishing.

• CompactPCI® standards compliant
• Allows CompactPCI System Cards to be used in any Slot
• Provides termination for up to ten channels
• Provides a series switch in each channel
• Supports hot-swap capability
• Very low capacitance load on each line
• Industrial temperature range
• 28-pin TSSOP package
• Lead-free version available