CY2287
2
Pin Summary
Name
Pins
Description
REF/SEL33
1
3.3V 14.31818-MHz clock output and power-on external select strap op-
tion for APIC clock frequency.
Strap LOW: APIC = PCI/2
Strap HIGH: APIC = 33.3 MHz
XTAL_IN[1]
3
14.31818-MHz crystal input
XTAL_OUT[1]
4
14.31818-MHz crystal output
PCI [0–7]
11, 12, 13, 15, 16, 18, 19, 20
3.3V PCI clock outputs
3V66 [0–1]
7, 8
3.3V Fixed 66.67-MHz clock outputs
USB [0–1]
25, 26
3.3V Fixed 48-MHz clock outputs
SEL [0–1]
28, 29
3.3V LVTTL compatible inputs for logic selection
PWRDWN
32
3.3V LVTTL compatible input. Device enters powerdown mode when held
LOW
CPU [0–2]
49, 50, 52
2.5V 66.67-MHz or 100-MHz (selectable) host bus clock output
SDRAM [0–8]
35, 36, 37, 39, 40, 42, 43, 45, 46 3.3V SDRAM clock outputs running 100 MHz
APIC [0–1]
54, 55
2.5V APIC clock outputs running synchronous with PCI clock frequency.
Selectable 16.67 MHz or 33.3 MHz
SDATA
30
I2C compatible SDATA input
SCLK
31
I2C compatible SCLK input
VDDREF
2
3.3V Power supply for REF output
VSSREF
5
REF ground
VSS3V66
6
3V66 Ground
VDD3V66
9
3.3V Power supply for 3V66 outputs
VDDPCI
10, 21
3.3V Power supply for PCI outputs
VSSPCI
14, 17
PCI ground
AVDD
22
3.3V Analog power supply
AVSS
23
Analog ground
VSSUSB
24
USB ground
VDDUSB
27
3.3V Power supply for USB outputs
VDDSDRAM
33, 38, 44
3.3V Power supply for SDRAM outputs
VSSSDRAM
35, 41, 47
SDRAM ground
VSSCPU
48
CPU ground
VDDCPU
51
2.5V Power supply for CPU outputs
VDDAPIC
53
2.5V Power supply for APIC outputs
VSSAPIC
56
APIC ground
Note:
1.
For best accuracy, use a parallel-resonant crystal, CLOAD = 18 pF. For crystals with different CLOAD, please refer to the application note, “Crystal Oscillator
Topics.”
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