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PLL205-01

Description
Motherboard Clock Generator for AMD - K7
File Size103KB,12 Pages
ManufacturerETC
Download Datasheet Compare View All

PLL205-01 Overview

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.
PIN CONFIGURATION
VDD0
REF0//CPU_STOP#^
GND
XIN
XOUT
VDD1
PCI5/MODE*^
PCI0/FS3*^
GND
PCI1/SEL24_48*^
PCI2
PCI3
PCI4
VDD2
SDRAMIN
GND
SDRAM11
SDRAM10
VDD3
SDRAM9
SDRAM8
GND
SDATA
SCLK
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
REF1/FS2*^
GND
CPUT1
GND
CPUC0
CPUT0
VDD3
PD#^
SDRAM12
GND
SDRAM0
SDRAM1
VDD3
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDD3
SDRAM6
SDRAM7
VDD4
48MHz/FS0*^
24_48MHz/FS1*^
Note: ^:
Pull up,
#:
Active Low
*
: Bi-directional latched at power-up
PLL205-01
BLOCK DIAGRAM
I/O MODE CONFIGURATION
MODE (Pin 7)
VDD1
XIN
XOUT
XTAL
OSC
REF(0:1)
PIN 2
REF0
CPU_STOP
1 (OUTPUT)
0 (INPUT)
CPUT(0:1)
POWER GROUP
VDD0: PLL CORE
VDD1: REF(0:1), XIN, XOUT
VDD2: PCI(0:5)
VDD3: SDRAM(0:12)
VDD4: 48MHz, 24_48MHz
SDATA
SCLK
FS (0:3)*
I2C
Logic
Control
Logic
CPUC0
VDD2
PCI(0:4)
PLL1
SST
PCI5
VDD4
48Mhz
PLL2
PD
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.
÷2
24_48Mhz
VDD3
SDRAM(0:11)
SDRAMIN
SDRAM12
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 03/07/00 Page 1

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