CMCPCI102B |
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CompactPCI™ Backplane Interface
PRODUCT DESCRIPTION |
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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 10Ω termination resistor for each channel to terminate the transmission line stub on the board. An integral series switch and associated 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 10kΩ resistor connected to the 1V Precharge Supply Voltage. If the precharge enable pin (P_EN) is asserted, then the 10kΩ pull-up resistors are connected to precharge the circuits. In addition, a system board requirement mandates either a 1.0kΩ pull-up resistor or a 2.7kΩ resistor connected to VIO. CompactPCI slot cards must work in either 3.3V or 5V systems, hence the need for both 2.7kΩ and 1kΩ resistors. If the 3_EN pin is logic high, the 2.7kΩ resistor is used as the pull-up. If the 5_EN pin is logic high, the 1kΩ 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. Note: Some of the devices listed here have suggested replacements available. Please see additional information at the end of this page. | |||||||||
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FEATURES |
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PACKAGING, FINISHING & STATUS INFORMATION | |||||||||
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PRODUCT REPLACEMENT INFORMATION | |||||||||
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Status Key More on End-of-Life and Obsolete Products | |||||||||
