Features
- Power up default is all outputs in 1:1 mode
- DIF_(14:0) can be "gear-shifted" from the input CPU Host Clock
- DIF_(18:15) can be "gear-shifted" from the input CPU Host Clock
- Spread spectrum compatible
- Supports output clock frequencies up to 400 MHz
- 8 Selectable SMBus addresses
- SMBus address determines PLL or Bypass mode
- Dedidated Power Down Pin
Description
The IDT9FG1904B-1 follows the Intel DB1900GS Differential Buffer Specification, except for the output groupings. This buffer provides 19 output clocks for CPU Host Bus, PCI-Express, or Fully Buffered DIMM applications. The outputs are configured with two groups. Both groups, DIF_(14:0) and DIF_(18:15) can be equal to or have a gear ratio to the input clock. A differential CPU clock from a CK410B+ main clock generator, such as the IDT932S421, drives the IDT9FG1904B-1. The IDT9FG1904B-1 can provide outputs up to 400MHz.
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