ICS9FG104 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4TM CPU, PCI-Express & SATA Clocks

Integrated
Circuit
Systems, Inc.
ICS9FG104
Programmable FTG for Differential P4^TM CPU, PCI-Express & SATA Clocks
Recommended Application:
Pin Configuration
Frequency Timing Generator for Differential CPU & SATA clocks
XIN/CLKIN 1
28 VDDA
Features:
• Generates common CPU frequencies from 14.318 MHz
or 25 MHz
X2 2
VDD 3
GND 4
27 GNDA
26 IREF
25 FS0
• Crystal or reference input
REFOUT 5
24 FS1
• 4 - 0.7V current-mode differential output pairs
FS2 6
23 DIF_0
• Supports Serial-ATA at 100 MHz
DIF_3 7
22 DIF_0#
• Two spread spectrum modes: 0 to -0.5 downspread and
+/-0.25% centerspread
• Unused inputs may be disabled in either driven or Hi-Z
state for power management.
• M/N Programming
DIF_3# 8
VDD 9
GND 10
DIF_2 11
DIF_2# 12
21 VDD
20 GND
19 DIF_1
18 DIF_1#
17 SEL14M_25M#
Key Specifications:
• Output cycle-to-cycle jitter < 50 ps
SDATA 13
SCLK 14
16 SPREAD
15 DIF_STOP#
• Output to output skew < 35 ps
• +/-300 ppm frequency accuracy on output clocks
28-pin SSOP/TSSOP
Frequency Select Table
SEL14M_25M#
(FS3)
FS2
FS1
FS0
OUTPUT(MHz)
0
000
100.00
0
001
125.00
0
010
133.33
0
011
166.67
0
100
200.00
0
101
266.00
0
110
333.00
0
111
400.00
1
000
100.00
1
001
125.00
1
010
133.33
1
011
166.67
1
100
200.00
1
101
266.00
1
110
333.00
1
111
400.00
0839D—06/02/05