ICS9FG107 Datasheet, PDF (3/14 Pages) Integrated Circuit Systems – Programmable FTG for Differential CPU, PCI Express & SATA Clocks

Integrated
Circuit
Systems, Inc.
ICS9FG107
Pin Description (Continued)
PIN
PIN NAME
PIN TYPE
#
DESCRIPTION
25 DIF_STOP#
IN Active low input to stop differential output clocks.
26 *SPREAD
IN
Asynchronous, active high input, with internal 120Kohm pull-up
resistor, to enable spread spectrum functionality.
27 **SEL14M_25M#
IN
Select 14.31818 MHz or 25 Mhz input frequency. 1 = 14.31818 MHz,
0 = 25 MHz
28 *OE_3
Active high input for enabling outputs.
IN
0 = tri-state outputs, 1= enable outputs
29 DIF_3#
OUT 0.7V differential complement clock outputs
30 DIF_3
OUT 0.7V differential true clock outputs
31 VDD
PWR Power supply, nominal 3.3V
32 DIF_2#
OUT 0.7V differential complement clock outputs
33 DIF_2
OUT 0.7V differential true clock outputs
34 **OE_2
IN
Active high input for enabling outputs.
0 = tri-state outputs, 1= enable outputs
35 GND
PWR Ground pin.
36 VDD
PWR Power supply, nominal 3.3V
37 **OE_1
IN
Active high input for enabling outputs.
0 = tri-state outputs, 1= enable outputs
38 DIF_1#
OUT 0.7V differential complement clock outputs
39 DIF_1
OUT 0.7V differential true clock outputs
40 VDD
PWR Power supply, nominal 3.3V
41 DIF_0#
OUT 0.7V differential complement clock outputs
42 DIF_0
OUT 0.7V differential true clock outputs
43 *OE_0
IN
Active high input for enabling outputs.
0 = tri-state outputs, 1= enable outputs
44 **FS1
I/O Frequency select latch input pin / 3.3V 66.66MHz clock output.
3.3V input that selects spread mode. This input is not latched at
45 *DWNSPRD#
IN power up.
0 = Down Spread, 1 = Center Spread
This pin establishes the reference current for the differential current-
46 IREF
OUT ^{mode output pairs. This pin requires a fixed precision resistor tied to}
ground in order to establish the appropriate current. 475 ohms is the
standard value.
47 GNDA
PWR Ground pin for the PLL core.
48 VDDA
PWR 3.3V power for the PLL core.
Pins preceeded by * have 120 Kohm pull DOWN resistors
Pins preceeded by ** have 120 Kohm pull UP resistors
0863C—11/22/04
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