cy28325-3 Cypress Semiconductor Corporation., cy28325-3 Datasheet - Page 3

• Manufacturer Part Number: cy28325-3
• Description: Ftg For Via Pentium 4 Chipsets
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-07590 Rev. *.*
Pin Definitions
Table 1. Frequency Selection Table
VTT_PWRGD#
VDD_CPU_CS,
VDD_APIC
VDD_REF,
VDD_48MHz,
VDD _PCI,
VDD_AGP,
VDD_CPU
GND_REF
GND_48MHz,
GND_PCI,
GND_AGP,
GND_CPU,
GND_APIC
SEL4
FS4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
Pin Name
SEL3
FS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
Input Conditions
(continued)
3, 9, 13, 20, 25,
2, 6, 16, 24, 38
36, 44, 47
SEL2
FS2
43, 48
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
No.
33
SEL1
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
Type
G
P
P
I
SEL0
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Power-good from Voltage Regulator Module (VRM): 3.3V LVTTL input.
VTT_PWRGD# is a level sensitive strobe used to determine when FS0:4
and MULTSEL inputs are valid and OK to be sampled (Active LOW). Once
VTT_PWRGD# is sampled LOW, the status of this input will be ignored.
2.5V Power Connection: Power supply for CPU_CS outputs buffers and
APIC output buffers. Connect to 2.5V.
3.3V Power Connection: Power supply for CPU outputs buffers, 3V66
output buffers, PCI output buffers, reference output buffers and 48-MHz
output buffers. Connect to 3.3V.
Ground Connection: Connect all ground pins to the common system
ground plane.
102.0
105.0
108.0
120.0
123.0
126.0
130.0
136.0
140.0
144.0
148.0
152.0
156.0
160.0
164.0
166.6
170.0
175.0
180.0
111.0
114.0
117.0
CPU
Output Frequency
AGP
68.0
70.0
72.0
74.0
76.0
78.0
80.0
82.0
63.0
65.0
68.0
70.0
72.0
74.0
76.0
78.0
80.0
82.0
66.6
68.0
70.0
72.0
Description
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
31.5
32.5
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
33.3
34.0
35.0
36.0
PCI
APIC
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
18.0
18.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
16.7
17.0
17.5
18.0
CY28325-3
Constants
PLL Gear
Page 3 of 19
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
(G)
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