PI6C106 Datasheet, PDF (1/8 Pages) Pericom Semiconductor Corporation – Pentium/Pro System Clock Chip

PI6C106
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Pentium/Pro^TM System Clock Chip
Features
• Three CPUs @2.5V, up to 100 MHz
• Seven PCIs @ 3.3V (including one free running, 1 early)
• One 48 MHz @ 3.3V fixed
• OneREF(3.3V,14.318MHz)
• OneIOAPIC(2.5V,14.318MHz)
• Strong REF clock (1V/ns @50pF load)
• Excellent power management features including
Power Down, PCI, and CPU stops
• Spread Spectrum for EMI control (0.5% down spread)
• Early PCI (2.5ns ±700ps)
• EnhancedPCICLK4(1.5X)
• 28-pin SSOP Packaging (H)
Block Diagram
Description
The PI6C106 is part of a reduced pin count two-chip clock solution
for designs using an Intel BX style chipset. Companion SDRAM
buffers are PI6C182 & PI6C184.
There are two PLLs, with the first PLL capable of spread spectum
operation. CPU frequencies up to 100 MHz are supported.
Frequency Table
SEL 100/66.6#
1
0
CPU MHz
100
66.6
PCI MHz
33.3
33.3
Pin Configuration
X1
X2
OSC
CPU_STOP#
SPREAD#
SEL 100/66.6#
PD#
PCI_STOP#
PLL
Spread
Spectrum
CPU
STOP
÷2
÷3
BUS
STOP#
PLL2
REF0
VDDLA
IOAPIC
VDDLC
CPUCLK(0:2)
PCICLK_E
PCICLK(0:4)
PCICLK_F
48MHz
GND1 1
X1 2
X2 ₃
GND2 ₄
PCICLK_E ₅
PCICLK_F ₆
PCICLK0 ₇
PCICLK1 ₈
VDD2 ₉
PCICLK2 ₁₀
PCICLK3 ₁₁
PCICLK4/
SEL100/66.6# ¹²
VDD3 ₁₃
48MHz ₁₄
28-Pin
H
28 ^REF0
27 ^VDD1
26 ^IOAPIC
25 ^VDDLA
24 ^CPUCLK0
23 ^CPUCLK1
22 ^CPUCLK2
21 ^VDDLC
20 ^GND
19 ^PCI_STOP#
18 ^CPU_STOP#
17 ^PD#
16 ^SPREAD#
15 ^GND3
1
PS8546A 07/13/01