CY2280
Pin Configurations
REF0
1
2
3
4
5
6
7
48-pin SSOP (Top View)
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
DDREF
REF2
V
DDAPIC
APIC0
APIC1
V
SS
RESERVED
V
DDCPU
CPUCLK0
CPUCLK1
V
SS
V
DDCPU
CPUCLK2
CPUCLK3
V
SS
AV
DD
V
SS
PCI_STOP
CPU_STOP
PWR_DWN
N/C
SEL0
SEL1
SEL100
REF0
REF1
V
SS
XTALIN
XTALOUT
V
SS
PCICLK_F
PCICLK1
V
DDPCI
PCICLK2
PCICLK3
V
SS
PCICLK4
PCICLK5
V
DDPCI
PCICLK6
PCICLK7
V
SS
AV
DD
V
SS
V
DDUSB
USBCLK0
USBCLK1
V
SS
1
2
3
4
5
6
7
48-pin SSOP (Top View)
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
DDREF
REF2
V
DDAPIC
APIC0
APIC1
V
SS
RESERVED
V
DDCPU
CPUCLK0
CPUCLK1
V
SS
V
DDCPU
CPUCLK2
CPUCLK3
V
SS
AV
DD
V
SS
PCI_STOP
CPU_STOP
PWR_DWN
SEL_SS
SEL0
SEL1
SEL100
REF1
V
SS
XTALIN
XTALOUT
V
SS
PCICLK_F
PCICLK1
V
DDPCI
PCICLK2
PCICLK3
V
SS
PCICLK4
PCICLK5
V
DDPCI
PCICLK6
PCICLK7
V
SS
AV
DD
V
SS
V
DDUSB
USBCLK0
USBCLK1
V
SS
CY2280-1
CY2280-11S
CY2280-21S
Pin Summary
Name
V
DDPCI
V
DDUSB
V
DDREF
V
DDAPIC
V
DDCPU
AV
DD
V
SS
XTALIN
[1]
XTALOUT
[1]
PCI_STOP
CPU_STOP
PWR_DWN
SEL_SS
N/C
SEL0
SEL1
SEL100
CPUCLK[0:3]
PCICLK[1:7]
PCICLK_F
APIC[0:1]
REF[0:2]
USBCLK[0:1]
RESERVED
Pins
15, 9
21
48
46
41, 37
33, 19
4
5
31
30
29
28
28
27
26
25
40, 39, 36, 35
8, 10, 11, 13, 14, 16, 17
7
45, 44
1, 2, 47
22, 23
42
Description
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
Reference crystal input
Reference crystal feedback
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)
CPU frequency select input, bit 0 (see Function Table)
CPU frequency select input, bit 1 (see Function Table)
CPU frequency select input, selects between 100 MHz and 66.6 MHz
(see Function Table)
CPU clock outputs
PCI clock outputs, at one-half or one-third the CPU frequency of 66.6 MHz
or 100 MHz respectively
Free-running PCI clock output
APIC clock outputs
3.3V Reference clock outputs
USB clock outputs
Reserved
Page 2 of 12
3, 6, 12, 18, 20, 24, 32, 34, 38, 43 Ground
Document #: 38-07207 Rev. *A
Note:
1. For best accuracy, use a parallel-resonant crystal, C
LOAD
= 18 pF.
CYPRESS [ CYPRESS SEMICONDUCTOR ]
