CY28378 Cypress Semiconductor, CY28378 Datasheet - Page 4

• Manufacturer Part Number: CY28378
• Description: FTG for Pentium 4 and Intel 845 Series Chipset
• Manufacturer: Cypress Semiconductor

Document #: 38-07519 Rev. **
Table 2. Frequency Selection Table
Swing Select Functions
MULTSEL1
SEL4
FS4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
SEL3
FS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MULTSEL0
Input Conditions
0
0
SEL2
FS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Board Target
Trace/Term Z
SEL1
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
50
50
SEL0
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Reference R, IREF =
100.7
100.9
108.0
101.2
114.0
117.0
120.0
123.0
125.7
130.3
133.9
134.2
134.5
148.0
152.0
156.0
160.0
164.0
167.4
170.0
175.0
180.0
185.0
190.0
166.8
100.2
133.6
200.4
166.6
100.0
200.0
133.3
IREF = 5.00 mA
IREF = 2.32 mA
CPU
Rr = 221 1%,
Rr = 475 1%,
VDD/(3*Rr)
Output Frequency
3V66
67.1
67.3
72.0
67.5
76.0
78.0
80.0
82.0
62.9
65.1
67.0
67.1
67.3
74.0
76.0
78.0
80.0
82.0
66.9
68.0
70.0
72.0
74.0
76.0
66.7
66.8
66.8
66.8
66.6
66.6
66.6
66.6
I
I
33.6
33.6
36.0
33.7
38.0
39.0
40.0
41.0
31.4
32.6
33.5
33.6
33.6
37.0
38.0
39.0
40.0
41.0
33.5
34.0
35.0
36.0
37.0
38.0
33.4
33.4
33.4
33.4
33.3
33.3
33.3
33.3
PCI
OH
OH
Current
Output
= 4*Iref
= 6*Iref
402.80
403.60
432.00
404.80
456.00
468.00
480.00
492.00
377.12
390.80
401.70
402.60
403.50
444.00
456.00
468.00
480.00
492.00
334.80
340.00
350.00
360.00
370.00
380.00
333.60
400.80
400.80
400.80
333.33
400.00
400.00
400.00
Freq.
VCO
1.0V @ 50
0.7V @ 50
V
Constants
OH
CY28378
PLL Gear
47.99750
47.99750
47.99750
47.99750
47.99750
47.99750
47.99750
47.99750
63.99667
63.99667
63.99667
63.99667
63.99667
63.99667
63.99667
63.99667
63.99667
63.99667
95.99500
95.99500
95.99500
95.99500
95.99500
95.99500
95.99500
47.99750
63.99667
95.99500
95.99500
47.99750
95.99500
63.99667
Page 4 of 22
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