W133 Cypress Semiconductor Corp., W133 Datasheet - Page 4

• Manufacturer Part Number: W133
• Description: Spread Spectrum System Frequency Synthesizer
• Manufacturer: Cypress Semiconductor Corp.

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