ICS9148-26 Datasheet, PDF (2/17 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/ProTM

ICS9148 - 26
Pin Descriptions
PIN NUMBER
1
2
3,9,16,22,
33,39,45
4
PIN NAME
VDD1
REF0
GND
X1
5
X2
6,14
VDD2
PCICLK_F
7
MODE^{1, 2}
8
10, 11, 12, 13
15
PCICLK0
PCICLK(1:4)
BUFFER IN
18
PCI_STOP#¹
17, 18, 20, 21,
28, 29, 31, 32,
34, 35,37,38,40,41
19,30,36
SDRAM (0:13)
VDD3
23
SDATA
24
SCLK
24MHz
25
FS1^{1, 2}
48MHz
26
FS0^{1, 2}
27
VDD4
43, 44
CPUCLK(0:1)
42
VDDL2
REF1
46
FS2^{1, 2}
17
CPU_STOP#¹
47
IOAPIC
48
VDDL1
TYPE
PWR
OUT
DESCRIPTION
Ref (0:2), XTAL power supply, nominal 3.3V
14.318 Mhz reference clock.This REF output is the
STRONGER buffer for ISA BUS loads
PWR Ground
IN
OUT
PWR
OUT
IN
OUT
OUT
IN
IN
OUT
PWR
IN
IN
OUT
IN
OUT
IN
PWR
OUT
PWR
OUT
IN
IN
OUT
PWR
Crystal input, has internal load cap (36pF) and feedback
resistor from X2
Crystal output, nominally 14.318MHz. Has internal load
cap (36pF)
Supply for PCICLK_F and PCICLK (0:5), nominal 3.3V
Free running PCI clock
Pin 17, pin 18 function select pin, 1=Desktop Mode, 0=Mobile
Mode. Latched Input.
PCI clock output.
PCI clock outputs.
Input to Fanout Buffers for SDRAM outputs.
Halts PCICLK(0:4) clocks at logic 0 level, when input low (In
mobile mode, MODE=0)
(Pins 17, 18 SDRAM output only if MODE=High)
SDRAM clock outputs, Fanout Buffer outputs from BUFFER IN pin
(controlled by chipset).
Supply for SDRAM (0:13) and CPU PLL Core, nominal 3.3V.
Data input for I²C serial input, 5V tolerant input
Clock input of I²C input, 5V tolerant input
24MHz output clock
Frequency select pin. Latched Input.
48MHz output clock
Frequency select pin. Latched Input
Power for 24 & 48MHz output buffers and fixed PLL core.
CPU clock outputs, powered by VDDL2. Low if CPU_STOP#=Low
Supply for CPU (0:1), either 2.5V or 3.3V nominal
14.318 MHz reference clock.
Frequency select pin. Latched Input
Halts CPUCLK (0:1) clocks at logic 0 level, when input low (in
Mobile Mode, MODE=0)
IOAPIC clock output. 14.318 MHz Powered by VDDL1.
Supply for IOAPIC, either 2.5 or 3.3V nominal
Notes:
1: Internal Pull-up Resistor of 240K to 3.3V on indicated inputs
2: Bidirectional input/output pins, input logic levels are latched at internal power-on-reset. Use 10Kohm resistor
to program logic Hi to VDD or GND for logic low.
2