CY28158PVCT Cypress Semiconductor, CY28158PVCT Datasheet - Page 2

• Manufacturer Part Number: CY28158PVCT
• Description: Spread Spectrum Timing Solution for Serverworks Chipset
• Manufacturer: Cypress Semiconductor

Pin Definitions
Document #: 38-07039 Rev. *B
X1
X2
CPU [0–5]
PCI [1–5]
PCI_F
3V66 [0–1]
IOAPIC [0–2]
REF [0–1]
48MHZ
CPU_STOP#
PCI_STOP#
PWR_DWN#
SPREAD#
SEL1
SEL0
SEL133/100#
GND_REF
GND_PCI
GND_3V66
GND_48MHZ
GND_IOAPIC
GND_CPU
GNDA
VDD_REF
VDD_PCI
VDD_3V66
VDD_48MHZ
VDD_IOAPIC
VDD_CPU
VDDA
Note:
1.
Name
[1]
[1]
For best accuracy, use a parallel-resonant crystal, C
Topics.”
5
6
41, 42, 45, 46, 49, 50
11, 12, 14, 15, 18
9
25, 26
53, 54, 55
2, 3
30
36
37
35
34
33
32
28
1
7, 8, 13, 19
20, 21, 24
29
52
40, 44, 48
38
4
10, 16, 17
22, 23, 27
31
56
43, 47, 51
39
Pins
LOAD
= 18 pF. For crystals with different C
IOAPIC clock outputs, running at 16.67 MHz
Reference crystal input
Reference crystal feedback
CPU clock outputs
PCI clock outputs, synchronously running at 33.33 MHz
Free running PCI clock
3V66 clock outputs, running at 66.66 MHz
Reference clock outputs, 14.318 MHz
48-MHz USB clock output
Active LOW input, disables CPU and 3V66 clocks when asserted
Active LOW input, disables PCI clocks when asserted
Active LOW input, powers down part when asserted
Active LOW input, enables spread spectrum when asserted
CPU frequency select input (See Function Table)
CPU frequency select input (See Function Table)
CPU frequency select input (See Function Table)
3.3V Reference ground
3.3V PCI ground
3.3V 66-MHz (AGP) ground
3.3V 48-MHz (USB) ground
2.5V APIC ground
2.5V CPU ground
Analog ground to PLL and Core
3.3V Reference voltage supply
3.3V PCI voltage supply
3.3V 66-MHz (AGP) voltage supply
3.3V 48-MHz (USB) voltage supply
2.5V APIC voltage supply
2.5V CPU voltage supply
Analog voltage supply to PLL and Core
Description
LOAD
, please refer to the application note, “Crystal Oscillator
CY28158
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