ics9fg1901 Integrated Device Technology, ics9fg1901 Datasheet - Page 4

• Manufacturer Part Number: ics9fg1901
• Description: Frequency Generator For P4? ? ? ? ? Cpu, Pci Express? ? ? ? ? & Fully Buffered Dimm Clocks
• Manufacturer: Integrated Device Technology

General Description
The ICS9FG1901 follows the Intel DB1900G Differential Buffer Specification. 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_(16:0) and
DIF_(18:17) can be equal to or have a gear ratio to the input clock. A differential CPU clock from a CK410 or CK410B main clock
generator, such as the ICS954101 or ICS932S401, drives the ICS9FG1901. The ICS9FG1901 can provide outputs up to
400MHz.
Block Diagram
Power Groups
0962E—01/02/07
11,27,47,63 10,28,46,64
VDD
3
Pin Number
Integrated
Circuit
Systems, Inc.
HIGH_BW#
FS_A_410
SMB_A0
SMB_A1
SMB_A2_PLLBYP#
SMBDAT
SMBCLK
CLK_IN
CLK_IN#
OE_17_18#
OE(16:5)#,
OE_01234#
GND
2
13
CONTROL
LOGIC
Main PLL, Analog
Description
DIF clocks
COMPATIBLE
COMPATIBLE
SPREAD
SPREAD
PLL
PLL
4
LOGIC
LOGIC
GEAR
SHIFT
GEAR
SHIFT
LOGIC
LOGIC
STOP
STOP
17
2
IREF
ICS9FG1901
DIF(18:17)
DIF(16:0)