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ICS9148-47 датащи(PDF) 2 Page - Integrated Circuit Systems

номер детали ICS9148-47
подробное описание детали  Pentium/ProTM System Clock Chip
PDF  9 Pages
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производитель  ICST [Integrated Circuit Systems]
домашняя страница  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS9148-47 датащи(HTML) 2 Page - Integrated Circuit Systems

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ICS9148-47
Pin Descriptions
PIN NUMBER
PIN NAME
TYPE
DESCRIPTION
1X1
IN
XTAL_IN 14.318MHz Crystal input, has internal 33pF load
cap and feed back resistor from X2
2
X2
OUT
XTAL_OUT Crystal output, has internal load cap 33pF
3
GND2
PWR
Ground for PCI outputs
4
PCICLK_F
OUT
Free Running PCI output
5, 6, 7, 8, 10, 11
PCICLK (0:5)
OUT
PCI clock outputs. TTL compatible 3.3V
6, 9
VDD2
PWR
Power for PCICLK outputs, nominally 3.3V
12
VDD3
PWR
Poer for 48MHz
13
48MHz
OUT
Fixed CLK output @ 48MHz
14
24/48MHz
OUT
Fixed CLK output; 24MHz if pin 27 =1 at power up, 48MHz
if pin 27=0 at power up.
15
GND3
PWR
Ground for 48MHz
16
SEL100/66.6#
IN
Select pin for enabling 100MHz or 66.6MHz
H=100MHz, L=66.6MHz (PCI always synchronous 33.3MHz)
17
SCLK
IN
Clock input for I2C input
18
SDATA
IN
Data input for I2C input
19
GND
PWR
Ground for CPUCLK (0:1)
20
VDD
PWR
Power for PLL core
21, 22
CPUCLK (1:0)
OUT
CPU and Host clock outputs nominally 2.5V
23
VDDL
PWR
Power for CPU outputs, nominally 2.5V
24
IOAPIC
OUT
IOAPIC clock output 14.318MHz.
25
VDDL
PWR
Power for IOAPIC
26
VDD1
PWR
Power for REF outputs.
27
REF0/SEL 48#
OUT/IN
14.318MHz clock output/Latched input at power up. When
low, pin 14 is 48MHz.
28
GND1
PWR
Ground for REF outputs, X1, X2.



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