PLL205-01 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – Motherboard Clock Generator for AMD - K7

PLL205-01
Motherboard Clock Generator for AMD - K7
FEATURES
• Generates all clock frequencies for VIA K7 chip
sets requiring multiple CPU clocks and high
speed SDRAM buffers.
• Support one pair of differential CPU clocks, one
open-drain CPU, 6 PCI and 13 high-speed
SDRAM buffers for 3-DIMM applications.
• One 24_48MHz clock and one 48MHz clock.
• Two14.318MHz reference clocks.
• Power management control to stop CPU, and
Power down Mode from I2C programming.
• Support 2-wire I2C serial bus interface with built-
in Vendor ID, Device ID and Revision ID.
• Single byte micro-step linear Frequency Progra-
mming via I2C with Glitch free smooth switching.
• Spread Spectrum ±0.25% center spread, 0 to
−0.5% downspread.
• 50% duty cycle with low jitter.
• Available in 300 mil 48 pin SSOP.
BLOCK DIAGRAM
XIN
XOUT
XTAL
OSC
SDATA
SCLK
FS (0:3)*
PD
I2C
Logic
Control
Logic
PLL1
SST
PLL2
÷2
SDRAMIN
VDD1
REF(0:1)
CPUT(0:1)
CPUC0
VDD2
PCI(0:4)
PCI5
VDD4
48Mhz
24_48Mhz
VDD3
SDRAM(0:11)
SDRAM12
PIN CONFIGURATION
VDD0 1
REF0//CPU_STOP#^
2
GND 3
XIN 4
XOUT 5
VDD1 6
PCI5/MODE*^ 7
PCI0/FS3*^ 8
GND 9
PCI1/SEL24_48*^
10
PCI2 11
PCI3 12
PCI4 13
VDD2 14
SDRAMIN
15
GND 16
SDRAM11
17
SDRAM10
18
VDD3 19
SDRAM9
20
SDRAM8
21
GND 22
SDATA 23
SCLK 24
48 REF1/FS2*^
47 GND
46 CPUT1
45 GND
44 CPUC0
43 CPUT0
42 VDD3
41 PD#^
40 SDRAM12
39 GND
38 SDRAM0
37 SDRAM1
36 VDD3
35 SDRAM2
34 SDRAM3
33 GND
32 SDRAM4
31 SDRAM5
30 VDD3
29 SDRAM6
28 SDRAM7
27 VDD4
26 48MHz/FS0*^
25 24_48MHz/FS1*^
Note: ^: Pull up, #: Active Low
*: Bi-directional latched at power-up
I/O MODE CONFIGURATION
MODE (Pin 7)
1 (OUTPUT)
0 (INPUT)
PIN 2
REF0
CPU_STOP
POWER GROUP
• VDD0: PLL CORE
• VDD1: REF(0:1), XIN, XOUT
• VDD2: PCI(0:5)
• VDD3: SDRAM(0:12)
• VDD4: 48MHz, 24_48MHz
KEY SPECIFICATIONS
• CPU Cycle to Cycle jitter: 250ps.
• PCI to PCI output skew: 500ps.
• CPU to CPU output skew: ±175ps
• SDRAM to SDRAM output skew: 250ps.
• CPU to PCI skew (CPU leads): 0 ~ 3 ns.
47745 Fremont Blvd., Fremont, California 94538 TEL [phone] FAX [phone]
Rev 03/07/00 Page 1