0
CY2220
133-MHz Spread Spectrum Clock Synthesizer/Driver
with Differential CPU Outputs
Features
Benefits
• Compliant to Intel® CK00 Clock Synthesizer/Driver
Supports next generation Pentium® processors using differen-
Specifications
tial clock drivers
• Multiple output clocks at different frequencies
—Four pairs of differential CPU outputs, up to 133 MHz
—Ten synchronous PCI clocks
Motherboard clock generator
—Support Multiple CPUs and a chipset
—Support for PCI slots and chipset
—Two Memory Reference clocks, 180 degrees out of
—Drives up to two Direct Rambus™ Clock Generators
phase
(DRCG)
—Four AGP and Hub Link clocks at 66 MHz
—Two 48-MHz clocks
—Supports USB host controller and SuperI/O chip
—Supports ISA slots and I/O chip
—Two reference clocks at 14.318 MHz
• Spread Spectrum clocking
Enables reduction of EMI and overall system cost
—31 kHz modulation frequency
—Default is –0.6%, which is recommended by Intel
• Power-down features
Enables ACPI compliant designs
• Three Select inputs
Supports up to eight CPU clock frequencies
Meets tight system timing requirements at high frequency
Enables ATE and “bed of nails” testing
• Low-skew and low-jitter outputs
• OE and Test Mode support
• 56-pin SSOP package
Widely available, standard package enables lower cost
Pin Configuration
Logic Block Diagram
SSOP
Top View
V
DDMEM
1
2
3
4
5
6
56
55
54
V
SSREF
REFCLK [0–1]
CPUCLK [0–3]
MemRef
REFCLK0/MultSel_0
REFCLK1/MultSel_1
MemRefB
V
V
53
52
51
50
SSMEM
DDREF
MultSel0
MultSel1
SPREAD
XTALIN
XTALOUT
V
CPUCLK_3
CPUCLK_3B
SSPCI
7
V
PCICLK_0
PCICLK_1
49
48
47
46
45
44
43
42
41
DDCPU
8
CPUCLKB [0–3]
XTALIN
14.318
MHz
OSC.
Divider
and
Stop Logic
CPU
PLL
9
CPUCLK_2
CPUCLK_2B
V
DDPCI
10
11
XTALOUT
MemRef, MemRefB
V
PCICLK_2
PCICLK_3
SSCPU
CPUCLK_1
12
13
SELA
SELB
SEL133
V
CPUCLK_1B
SSPCI
PCICLK [0–9] (33.33 MHz)
EPROM
V
14
15
16
17
18
PCICLK_4
PCICLK_5
DDCPU
CPUCLK_0
V
DDPCI
CPUCLK_0B
SPREAD
PWR_DWN
V
40
39
38
37
36
35
34
PCICLK_6
PCICLK_7
SSCPU
3V66 [0–3] (66.67 MHz)
I
REF
V
SSPCI
19
20
AV
AV
DD
SS
PCICLK_8
PCICLK_9
SYS
PLL
USBCLK [0-1] (48 MHz)
V
21
22
23
24
25
DD3V66
3V66_3
3V66_2
V
DDPCI
Sel133
V
V
33
32
31
30
29
SSUSB
SS3V66
USBCLK0/SelA
USBCLK1/SelB
V
SS3V66
3V66_1
3V66_0
26
27
28
V
DDUSB
PWR_DWN
V
DD3V66
Intel and Pentium are registered trademarks of Intel Corporation.
Direct Rambus is a trademark of Rambus, Inc.
Cypress Semiconductor Corporation
Document #: 38-07206 Rev. *A
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Revised December 30, 2002