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CY28159 Datasheet(PDF) 2 Page - Cypress Semiconductor

Part No. CY28159
Description  Clock Generator for Serverworks Grand Champion Chipset Applications
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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CY28159 Datasheet(HTML) 2 Page - Cypress Semiconductor

 
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CY28159
Document #: 38-07118 Rev. **
Page 2 of 13
Note:
1.
Definition of I/O column mnemonic on pin description table above 1= Input pin, O = output pin, P = power supply pin, PU = indicates that a bidirectional pin
contains pull-up resistor. This will insure that this pin of the device will be seen by the internal logic as a logic 1 level. Likewise pins with a PD designation are
guaranteed to be seen as a logic 0 level if no external level setting circuitry is present at power up.
Pin Description
Pin
Name
I/O[1]
Description
20
SSCG
PU
I
When asserted LOW, this pin invokes Spread Spectrum functionality. Spread
spectrum is applicable to CPU(0:7), CPU(0:7)#. This pin has a 250-k
Ω inter-
nal pull-up.
7,10, 13, 16,
42, 39, 36, 33
CPU(0:7)
O
Differential host clock outputs. These outputs are used in pairs, (CPU0-0#,
CPU1-1#, CPU2-2#, CPU3-3#, CPU4-4#, CPU5-5#, CPU6-6#, and CPU7-7#)
for differential clocking of the host bus. CPU(0:7) are 180 degrees out of phase
with their complements, CPU(0:7)#. See Table 1 on page 1
8, 11, 14, 17,
41, 38, 35, 32
CPU(0:7)#
26
IRef
P
This pin establishes the reference current for the internal current steering buff-
ers of the CPU clocks. A resistor is connected from this pin to ground to set
the value of this current.
1
3V33
O
Fixed 33.3-MHz clock output.
44
PD#
PU
I
When asserted LOW, this pin invokes a power-down mode by shutting off all
the clocks, disabling all internal circuitry, and shutting down the crystal oscil-
lator. The 48M(0:1) and REF clocks are driven LOW during this condition and
the CPU clocks are driven HIGH and programmed with an 2X IREF current. It
has a 250-k
Ω internal pull-up.
3, 4
48M(0,1), S(0,1)
IO
S0 and S1 inputs are sensed on power-up and then internally latched. After-
wards the pins are 3V 48-MHz clocks.
48
SEL100/133
PU
I
Input select pin. See Table 1 on page 1.
It has a 250-k
Ω internal Pull-up
23
XOUT
O
Crystal Buffer output pin. Connects to a crystal only. When an external signal
other than a crystal is used or when in Test mode, this pin is kept unconnected.
22
XIN
I
Crystal Buffer input pin. Connects to a crystal, or an external single ended
input clock signal.
19
REF
O
A buffered output clock of the signal applied at Xin. Typically, 14.31818 MHz.
30, 29
Mult(0,1)
I
These input select pins configure the Ioh current (and thus the Voh swing
amplitude) of the CPU clock output pairs. Each pin has a 250-k
Ω internal
Pull-up. See Table 5 for current and resistor values.
25, 46
VDDA
P
3.3V power supply pins.
2, 6, 12, 18,
24, 31, 37, 43
VDD
P
3.3V power supply pins for common supply to the core.
5, 9, 15, 21,
28, 34, 40, 47
VSS
P
Ground pins for common supply to the core.
27, 45
VSSA
P
Ground pins.


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