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W48S111-14 Datasheet Preview

W48S111-14 Datasheet

Spread Spectrum Desktop / Notebook System Frequency Generator

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Advance Information
W48S111-14
Spread Spectrum Desktop / Notebook System Frequency Generator
Features
• Maximized EMI suppression using IC WORKS’ Spread
Spectrum Technology
• Reduces measured EMI by as much as 10dB
• I2C programmable to 133MHz
• Two skew-controlled copies of CPU output
• SEL100/66# selects CPU frequency (100 or 66.8MHz)
• Seven copies of PCI output (synchronous w/CPU output)
• One copy of 14.31818 MHz IOAPIC output
• One copy of 48MHz USB output
• Selectable 24/48MHz clock is determined by resistor
straps on power up
• One high drive output buffer that produces a copy of the
14.318MHz reference
• Isolated core VDD pin for noise reduction
Key Specifications
Supply Voltages:
VDDQ3 = 3.3V±5%
VDDQ2 = 2.5V±5%
CPU Cycle to Cycle Jitter:
200ps
CPU, PCI Output Edge Rate:
1V/ns
CPU0:1 Output Skew:
175ps
PCI_F, PCI1:6 Output Skew:
500ps
CPU to PCI Skew:
1.5 - 4.0ns (CPU Leads)
REF2X/SEL48#, SCLOCK, SDATA:
250Kpull-up
Note: Internal pull up resistors should not be relied upon for
setting I/O pins high.
Figure 1 Block Diagram
X1 XTAL
X2 OSC
PLL Ref Freq
100/66#_SEL
PLL 1
÷2/÷3
SDATA
SCLOCK
I2C
LOGIC
PLL2
VDDQ3
REF2X/SEL48#
GND
VDDQ3
IOAPIC
Table 1 Pin Selectable Frequency
SEL100/66#
CPU(0:1)
1 100MHz
0 66.8MHz
Figure 2 Pin Diagram
PCI
33.3MHz
33.4MHz
VDDQ2
CPU0
CPU1
GND
VDDQ3
PCI_F
PCI1
PCI2
PCI3
PCI4
PCI5
PCI6
GND
X1
X2
GND
PCI_F
PCI1
PCI2
PCI3
PCI4
VDDQ3
PCI5
PCI6
VDDQ3
48MHz
24/48MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 GND
27 REF2X/SEL48#
26 VDDQ3
25 VDDQ2
24 IOAPIC
23 VDDQ2
22 CPU0
21 CPU1
20 VDDQ3
19 GND
18 SDATA
17 SCLOCK
16 SEL100/66#
15 GND
Table 2 Order Information
Part Number
Freq. Mask
Code
Package
W48S111
-14 G = SOIC (300 mils)
VDDQ3
48MHz
24/48MHz
GND
June 1998
Revision 0.2
IC WORKS · 101 Nicholson Lane· San Jose, CA 95134-1359· (408) 922-0202




IC WORKS

W48S111-14 Datasheet Preview

W48S111-14 Datasheet

Spread Spectrum Desktop / Notebook System Frequency Generator

No Preview Available !

Advance Information
W48S111-14
Pin Definitions
Pin Name
CPU0:1
PCI1:6
PCI_F
IOAPIC
48MHz
24/48MHz
REF2X/
SEL48#
SEL100/66#
SDATA
SCLOCK
X1
X2
VDDQ3
VDDQ2
GND
Pin
No.
22, 21
5, 6, 7, 8,
10, 11, 4
24
13
14
27
16
18
17
1
2
9, 12, 20, 26
23, 25
3, 15, 19, 28
Pin
Type
O
O
O
O
O
I/O
I
I/O
I
I
I
P
P
G
Pin Description
CPU Clock Outputs 0 through 1: These two CPU clocks run at a frequency set
by SEL100/66#. Output voltage swing is set by the voltage applied to VDDQ2.
PCI Bus Clock Outputs 1 through 6 and PCI_F: These seven PCI clock outputs
run synchronously to the CPU clock. Voltage swing is set by the power connection
to VDDQ3.
I/O APIC Clock Output: Provides 14.318MHz fixed frequency. The output volt-
age swing is set by the power connection to VDDQ2.
48MHz Output: Fixed 48MHz USB clock. Output voltage swing is controlled by
voltage applied to VDDQ3.
24MHz or 48MHz Output: Frequency is set by the state of pin 27 on power up.
I/O Dual Function REF2X and SEL48# pin: Upon power-up, the state of SEL48#
is latched. The initial state is set by either a 10K resistor to GND or to VDD. A 10K
resistor to GND causes pin 14 to output 48MHz. If the pin is strapped to VDD, pin
14 will output 24MHz. After 2ms, the pin becomes a high drive output that pro-
duces a copy of 14.318MHz.
Frequency Selection Input: Selects CPU clock frequency as shown in Table 1
on page 1.
I2C Data Pin: Data should be presented to this input as described in the I2C sec-
tion of this data sheet. Internal 250K ohm pull-up resistor.
I2C clock Pin: The I2C Data clock should be presented to this input as described
in the I2C section of this data sheet.
Crystal Connection or External Reference Frequency Input: Connect to either
a 14.318MHz crystal or other reference signal.
Crystal Connection: An input connection for an external 14.318MHz crystal. If
using an external reference, this pin must be left unconnected.
Power Connection: Power supply for core logic and PLL circuitry, PCI, 48/
24MHz, and Reference output buffers. Connect to 3.3V supply.
Power Connection: Power supply for IOAPIC and CPU output buffers. Connect
to 2.5V supply.
Ground Connections: Connect all ground pins to the common system ground
plane.
Page 2
Spread Spectrum Desktop / Notebook System Frequency Generator
Revision 0.2


Part Number W48S111-14
Description Spread Spectrum Desktop / Notebook System Frequency Generator
Maker IC WORKS
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