MPC9140

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Product Preview 1:18 LVCMOS Fanout Buffer The MPC9140 is a 1:18 LVCMOS fanout buffer targeted to support Intel based Pentium II™ microprocessor chip sets. The device features 18 low skew outputs optimized to drive the clock inputs of standard unbuffered SDRAM modules. Standard unbuffered SDRAM modules require four clocks per module allowing for the device to drive up to four modules. The output buffers have been optimized to drive the load presented by the SDRAM module. The MPC9140 provides output shut off capabilities via an I2C serial port for applications which plan to use fewer than four modules and desire to minimize the power dissipation of the chip. Every output clock can be www.DataSheet4U.com individually enabled/disabled through fields in the I2C control registers. After power up the default state is all outputs enabled. In applications where this default state is acceptable the I2C ports need not be exercised. MPC9140 1:18 LVCMOS FANOUT BUFFER Supports Intel Pentium™ and Pentium II Processor Architectures 18 Skew Controlled 3.3V Compatible SDRAM Clocks I2C Serial Bus Interface Extensive Output Enable Control Capability Space Efficient 48–Lead SSOP Package Operating Temperature Range of 0°C to 70°C 3.3V ± 5% Power Supply NC NC VDD SDRAM0 SDRAM1 VSS VDD SDRAM2 SDRAM3 VSS BUF_IN VDD2 SDRAM4 SDRAM5 VSS VDD SDRAM6 SDRAM7 VSS VDD SDRAM16 VSS VDD SDATA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24...