W133
| Model | W133 |
| Description | Spread Spectrum System Frequency Synthesizer |
| PDF file | Total 12 pages (File size: 149K) |
| Chip Manufacturer | CYPRESS |
PRELIMINARY
Mode Selection Functions
The W133 supports the following operating modes controlled through the SEL133/100#, SEL0, and SEL1 inputs.
Table 2. Select Functions
SEL133/100#
0
0
0
0
1
1
1
1
Table 3. Truth Table
SEL
133/100#
0
0
0
0
1
1
1
1
SEL1
0
0
1
1
0
0
1
1
SEL0
0
1
0
1
0
1
0
1
CPU
HI-Z
n/a
100 MHz
100 MHz
TCLK/2
n/a
133 MHz
133 MHz
CPUdiv2
HI-Z
n/a
50 MHz
50 MHz
TCLK/4
n/a
66 MHz
66 MHz
3V66
HI-Z
n/a
66 MHz
66 MHz
TCLK/4
n/a
66 MHz
66 MHz
PCI
HI-Z
n/a
33 MHz
33 MHz
TCLK/8
n/a
33 MHz
33 MHz
48MHz
HI-Z
n/a
HI-Z
48 MHz
TCLK/2
n/a
HI-Z
48 MHz
REF
HI-Z
n/a
IOAPIC
HI-Z
n/a
SEL1
0
0
1
1
0
0
1
1
SEL0
0
1
0
1
0
1
0
1
(Reserved)
Function
All Outputs Three-State
W133
Active 100 MHz, 48 MHz PLL Inactive
Active 100 MHz, 48 MHz PLL Active
Test Mode
(Reserved)
Active 133 MHz, 48 MHz PLL Inactive
Active 133 MHz, 48 MHz PLL Active
Notes
2
3
4, 7, 8
5, 6
3
4, 7, 8
14.318 MHz 16.67 MHz
14.318 MHz 16.67 MHz
TCLK
n/a
TCLK16
n/a
14.318 MHz 16.67 MHz
14.318 MHz 16.67 MHz
Table 4. Maximum Supply Current
Max. 2.5V supply consumption
Max. discrete cap loads,
V
DDQ2
=2.625V
All static inputs=V
DDQ3
or GND
100 µA
75 mA
Max. 3.3V supply consumption
Max. discrete cap loads,
V
DDQ3
=3.465V or GND
200 µA
160 mA
Condition
Powerdown Mode
(PWRDWN#=0)
FUll Active 100MHz
SEL133/100#=0
SEL1, 0=11
CPU_STOP#, PCI_STOP#=1
Full Active 133MHz
SEL133/100#=0
SEL1, 0=11
CPU_STOP#, PCI_STOP#=1
90 mA
160 mA
Notes:
2. Provided for board level “bed of nails” testing.
3. 48-MHz PLL disabled to reduce component jitter.
4. “Normal” mode of operation.
5. TCLK is a test clock over driven on the X1 input during test mode. TCLK mode is based on 133-MHz CPU select logic.
6. Required for DC output impedance verification.
7. Range of reference frequency is min.=14.316, nominal = 14.31818 MHz, max.=14.32 MHz.
8. Frequency accuracy of 48 MHz is +167 PPM to match USB default.
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