Update: 30 September, 2023
The CDC9842 is a high-performance clock synthesizer/driver that generates the system clocks necessary to support Pentium/82430X/82430VX and PentiumPro 82440FX chipsets. It provides four host-clock outputs (HCLKn) that are programmable to one of three frequencies (50 MHz, 60 MHz, or 66 MHz) via the SEL0 and SEL1 control inputs. Six PCI-clock outputs (PCLKn) are half the frequency of CPU clock outputs and are delayed 1 ns to 4 ns from the rising edge of the CPU clock. In addition, a universal serial bus (USB) clock output at 48 MHz (SBCLK) and three 14.318-MHz reference clock outputs (REF0, REF1, REF2) are provided. All output frequencies are generated from a 14.318-MHZ crystal input. A reference clock can be provided at the X1 input instead of the crystal input.
File format: PDF
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MD5 Checksum: 8C869C0A6BC0077410253817671B603D
Publication date: 01 August, 2012
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PDF Link: TEXAS INSTRUMENTS CDC9842 PC MOTHERBOARD CLOCK SYNTHESIZER/DRIVER WITH 3-STATE OUTPUTS handbook PDF