PI6C104 Datasheet, PDF (1/14 Pages) Pericom Semiconductor Corporation – Spread Spectrum Clock Synthesizer for Desktop Pentium II

PI6C104
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Spread Spectrum Clock Synthesizer
for Desktop Pentium II
Features
• Up to 112 MHz operation
• Spread Spectrum Modulation for CPUCLK, and PCICLK
• Two copies of CPU clock with V_DD of 2.5V ±5%
• Seven copies of PCI clock,
(synchronous with CPU clock) 3.3V
• One copy of Ref. clock @ 14.31818MHz (3.3V_TTL)
• 48MHz USB Clock, 24MHz Super I/O clock
• I²C Serial Configuration Interface
• Low cost 14.31818MHz crystal oscillator input
• Power management control
• Isolated core V_DD, V_SS pins for noise reduction
• 28-pin SSOP (H) and SOIC package (S)
Description
The PI6C104 is a high-speed low-noise clock generator designed
to work with the PI6C18X family of clock buffer to meet all clock
needs for Desktop Intel Architecture platforms. CPU and chipset
clock frequencies from 66.6 MHz to 112 MHz are supported.
Split supplies of 3.3V and 2.5V are used. The 3.3V power supply
powers a portion of the I/O and the core. The 2.5V is used to power
the remaining outputs (CPU and APIC). 2.5V signaling follows
JEDEC standard 8-X. Power sequencing of the 3.3V and 2.5V
supplies is not required.
An asynchronous PD# signal may be used to orderly power down
(or up) the system during power on.
Block Diagram
Pin Configuration
V_DDAPIC
XTAL_IN
XTAL_OUT
REF
OSC
V_DDREF
SEL
S[0..2]
V_DDCPU
PLL1
Div
V_DDPCI0,1
S_DATA
SCLOCK
I²C
APIC
REF1
2
CPUCLK[0:1]
6
PCICLK[1:6]
PCICLK_F
PLL2
V_DDP2
PI4
MUX
48MHz
24MHz/REF
XTAL_IN 1
XTAL_OUT 2
VSS ₃
PCICLK_F/S1 4
PCICLK1 5
PCICLK2 6
PCICLK3 7
PCICLK4 8
VDD 9
PCICLK5 10
PCICLK6/PD# 11
VDD 12
48M/MODE 13
24M/REF/S2 14
28-Pin
H, S
28 VSS
27 REF1/P14
26 VDD
25 VDD2
24 APIC
23 VDD2
22 CPUCLK0
21 CPUCLK1
20 VDD
19 VSS
18 SDATA
17 SCLK
16 S0
15 VSS
234
PS8164B 03/15/99