CY2280
Pin Configurations
REF0
REF1
REF0
V
V
1
2
3
4
5
6
48
47
46
1
2
3
4
5
6
48
47
46
DDREF
DDREF
REF1
REF2
V
REF2
V
V
V
SS
SS
DDAPIC
DDAPIC
XTALIN
XTALIN
45
44
43
42
41
45
44
43
42
41
APIC0
APIC1
APIC0
APIC1
XTALOUT
V
XTALOUT
V
SS
SS
V
V
SS
SS
PCICLK_F
PCICLK1
PCICLK_F
PCICLK1
RESERVED
RESERVED
7
7
V
V
8
8
DDCPU
DDCPU
V
V
DDPCI
DDPCI
9
9
40
39
38
CPUCLK0
CPUCLK1
CPUCLK0
CPUCLK1
40
39
38
10
11
12
10
11
12
PCICLK2
PCICLK3
PCICLK2
PCICLK3
V
V
SS
SS
V
V
37
36
35
34
SS
SS
37
36
35
34
V
V
DDCPU
DDCPU
13
14
15
16
17
18
19
20
21
22
23
24
13
PCICLK4
PCICLK5
PCICLK4
PCICLK5
CPUCLK2
CPUCLK3
CPUCLK2
CPUCLK3
14
15
16
17
18
19
20
21
22
23
24
V
V
DDPCI
DDPCI
V
V
SS
SS
33
32
31
30
29
28
27
26
25
33
32
31
30
29
28
27
26
25
PCICLK6
PCICLK7
AV
DD
PCICLK6
PCICLK7
AV
DD
V
V
SS
SS
V
V
SS
PCI_STOP
CPU_STOP
PWR_DWN
SEL_SS
SS
PCI_STOP
CPU_STOP
PWR_DWN
N/C
AV
DD
AV
DD
V
V
SS
SS
V
V
DDUSB
DDUSB
USBCLK0
USBCLK1
USBCLK0
USBCLK1
SEL0
SEL1
SEL0
SEL1
CY2280-11S
CY2280-21S
V
V
SS
SS
SEL100
CY2280-1
SEL100
Pin Summary
Name
Pins
15, 9
21
Description
VDDPCI
3.3V Digital voltage supply for PCI clocks
3.3V Digital voltage supply for USB clocks
3.3V Digital voltage supply for REF clocks
2.5V Digital voltage supply for APIC clocks
2.5V Digital voltage supply for CPU clocks
Analog voltage supply, 3.3V
VDDUSB
VDDREF
VDDAPIC
VDDCPU
AVDD
48
46
41, 37
33, 19
VSS
3, 6, 12, 18, 20, 24, 32, 34, 38, 43 Ground
XTALIN[1]
XTALOUT[1]
PCI_STOP
CPU_STOP
PWR_DWN
SEL_SS
N/C
4
Reference crystal input
5
Reference crystal feedback
31
30
29
28
28
27
26
25
Active LOW control input to stop PCI clocks
Active LOW control input to stop CPU clocks
Active LOW control input to power down device
Spread spectrum select input (-11S and -21S options)
Spread spectrum select input (-1 option)
SEL0
CPU frequency select input, bit 0 (see Function Table)
CPU frequency select input, bit 1 (see Function Table)
SEL1
SEL100
CPU frequency select input, selects between 100 MHz and 66.6 MHz
(see Function Table)
CPUCLK[0:3]
PCICLK[1:7]
40, 39, 36, 35
CPU clock outputs
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
APIC[0:1]
7
Free-running PCI clock output
APIC clock outputs
45, 44
1, 2, 47
22, 23
42
REF[0:2]
3.3V Reference clock outputs
USB clock outputs
USBCLK[0:1]
RESERVED
Reserved
Note:
1. For best accuracy, use a parallel-resonant crystal, C
Rev 1.0,November 25, 2006
= 18 pF.
LOAD
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