CY2280
Document #: 38-07207 Rev. *A
Page 2 of 12
Pin Summary
Name
Pins
Description
VDDPCI
15, 9
3.3V Digital voltage supply for PCI clocks
VDDUSB
21
3.3V Digital voltage supply for USB clocks
VDDREF
48
3.3V Digital voltage supply for REF clocks
VDDAPIC
46
2.5V Digital voltage supply for APIC clocks
VDDCPU
41, 37
2.5V Digital voltage supply for CPU clocks
AVDD
33, 19
Analog voltage supply, 3.3V
VSS
3, 6, 12, 18, 20, 24, 32, 34, 38, 43 Ground
XTALIN[1]
4
Reference crystal input
XTALOUT[1]
5
Reference crystal feedback
PCI_STOP
31
Active LOW control input to stop PCI clocks
CPU_STOP
30
Active LOW control input to stop CPU clocks
PWR_DWN
29
Active LOW control input to power down device
SEL_SS
28
Spread spectrum select input (-11S and -21S options)
N/C
28
Spread spectrum select input (-1 option)
SEL0
27
CPU frequency select input, bit 0 (see Function Table)
SEL1
26
CPU frequency select input, bit 1 (see Function Table)
SEL100
25
CPU frequency select input, selects between 100 MHz and 66.6 MHz
(see Function Table)
CPUCLK[0:3]
40, 39, 36, 35
CPU clock outputs
PCICLK[1:7]
8, 10, 11, 13, 14, 16, 17
PCI clock outputs, at one-half or one-third the CPU frequency of 66.6 MHz
or 100 MHz respectively
PCICLK_F
7
Free-running PCI clock output
APIC[0:1]
45, 44
APIC clock outputs
REF[0:2]
1, 2, 47
3.3V Reference clock outputs
USBCLK[0:1]
22, 23
USB clock outputs
RESERVED
42
Reserved
Note:
1.
For best accuracy, use a parallel-resonant crystal, CLOAD = 18 pF.
Pin Configurations
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
REF0
34
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
REF1
VSS
XTALIN
XTALOUT
PCICLK_F
VSS
PCICLK1
PCICLK2
VDDPCI
PCICLK3
VSS
PCICLK4
VDDPCI
PCICLK5
PCICLK7
VSS
AVDD
VSS
VDDUSB
USBCLK0
USBCLK1
VSS
VDDREF
REF2
VDDAPIC
APIC0
APIC1
VSS
RESERVED
VDDCPU
CPUCLK0
CPUCLK1
VSS
VDDCPU
CPUCLK2
CPUCLK3
VSS
AVDD
PCI_STOP
PWR_DWN
N/C
SEL0
SEL1
SEL100
CPU_STOP
VSS
PCICLK6
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
REF0
34
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
REF1
VSS
XTALIN
XTALOUT
PCICLK_F
VSS
PCICLK1
PCICLK2
VDDPCI
PCICLK3
VSS
PCICLK4
VDDPCI
PCICLK5
PCICLK7
VSS
AVDD
VSS
VDDUSB
USBCLK0
USBCLK1
VSS
VDDREF
REF2
VDDAPIC
APIC0
APIC1
VSS
RESERVED
VDDCPU
CPUCLK0
CPUCLK1
VSS
VDDCPU
CPUCLK2
CPUCLK3
VSS
AVDD
PCI_STOP
PWR_DWN
SEL_SS
SEL0
SEL1
SEL100
CPU_STOP
VSS
PCICLK6
CY2280-1
CY2280-11S
CY2280-21S
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