CY2280 Cypress Semiconductor, CY2280 Datasheet - Page 2

• Manufacturer Part Number: CY2280
• Description: 100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs
• Manufacturer: Cypress Semiconductor

Pin Summary
Document #: 38-07207 Rev. *A
V
V
V
V
V
AV
V
XTALIN
XTALOUT
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
Note:
Pin Configurations
1.
Name
DDPCI
DDUSB
DDREF
DDAPIC
DDCPU
SS
DD
For best accuracy, use a parallel-resonant crystal, C
[1]
[1]
15, 9
21
48
46
41, 37
33, 19
3, 6, 12, 18, 20, 24, 32, 34, 38, 43 Ground
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
Pins
PCICLK_F
XTALOUT
USBCLK0
USBCLK1
PCICLK1
PCICLK2
PCICLK3
PCICLK4
PCICLK5
PCICLK6
PCICLK7
XTALIN
V
V
V
DDUSB
REF0
REF1
DDPCI
DDPCI
AV
V
V
V
V
V
V
DD
SS
SS
SS
SS
SS
SS
1
2
3
4
5
6
7
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
N/C
V
REF2
V
APIC0
APIC1
V
RESERVED
V
CPUCLK0
CPUCLK1
V
V
CPUCLK2
CPUCLK3
V
AV
PCI_STOP
PWR_DWN
SEL0
SEL1
SEL100
V
CPU_STOP
LOAD
DDREF
DDAPIC
SS
DDCPU
SS
DDCPU
SS
SS
DD
= 18 pF.
CY2280-1
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
Description
PCICLK_F
XTALOUT
USBCLK0
USBCLK1
PCICLK1
PCICLK2
PCICLK3
PCICLK4
PCICLK5
PCICLK6
PCICLK7
XTALIN
V
V
V
DDUSB
REF0
REF1
DDPCI
DDPCI
AV
V
V
V
V
V
V
DD
SS
SS
SS
SS
SS
SS
1
2
3
4
5
6
7
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
SEL_SS
V
REF2
V
APIC0
APIC1
V
RESERVED
V
CPUCLK0
CPUCLK1
V
V
CPUCLK2
CPUCLK3
V
AV
V
PCI_STOP
CPU_STOP
PWR_DWN
SEL0
SEL1
SEL100
DDREF
DDAPIC
SS
DDCPU
SS
DDCPU
SS
SS
DD
CY2280-11S
CY2280-21S
CY2280
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