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CY2220
Document #: 38-07206 Rev. *A
Page 3 of 11
Function Table[3]
SEL133
SELA
SELB
CPUCLK
(MHz)
MemRef
(MHz)
3V66CLK
(MHz)
PCICLK
(MHz)
USBCLK
(MHz)
REFCLK
(MHz)
0
0
0
100
50
66
33
48
14.318
0
0
1
N/A
N/A
N/A
N/A
N/A
N/A
0
1
0
N/A
N/A
N/A
N/A
N/A
N/A
0
1
1
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
1
0
0
133
66
66
33
48
14.318
1
0
1
N/A
N/A
N/A
N/A
N/A
N/A
1
1
0
N/A
N/A
N/A
N/A
N/A
N/A
1
1
1
TCLK/2
TCLK/4
TCLK/4
TCLK/8
TCLK/2
TCLK
Actual Clock Frequency Values
Clock
Output
Target
Frequency
(MHz)
CY2220-1
CY2220-2
Actual Frequency
(MHz)
PPM
Actual Frequency
(MHz)
PPM
CPUCLK
100
99.126
–8741
100.227
+2270
CPUCLK
133
132.769
–1740
133.269
+2022
USBCLK
48
48.008
167
48.008
167
Swing Select Functions
MultSel0
MultSel1
Board Target
Reference R, IREF =
Output
Current
VOH @ Z,
Iref = 2.32 mA
00
60
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 5*Iref
0.71 @ 60
00
50
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 5*Iref
0.59 @ 50
01
60
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 6*Iref
0.85 @ 60
01
50
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 6*Iref
0.71 @ 50
10
60
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 4*Iref
0.56 @ 60
10
50
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 4*Iref
0.47 @ 50
11
60
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 7*Iref
0.99 @ 60
11
50
Ω
Rr = 475 ± 1%,
Iref = 2.32 mA
IOH = 7*Iref
0.82 @ 50
Clock Driver Impedances
Impedance
Buffer Name
VDD Range
Buffer Type
Minimum
Ω
Typical
Ω
Maximum
Ω
CPUCLK, CPUCLKB
Type X1
USB, REF
3.135–3.465
Type 3
20
40
60
PCI, 3V66
3.135–3.465
Type 5
12
30
55
MemRef, MemRefB
3.135–3.465
Type 5
12
30
55
Note:
3.
TCLK is a test clock driven in on the XTALIN input in test mode.
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