cy25561 Cypress Semiconductor Corporation., cy25561 Datasheet - Page 5

• Manufacturer Part Number: cy25561
• Description: Spread Spectrum Clock Generator
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-07242 Rev. *B
CY25561 Application Schematic
The schematic in Figure 3 above demonstrates how the
CY25561 is configured in a typical application. This application
is using a 90-MHz reference clock connected to pin 1.
Because an external reference clock is used, pin 8 (XOUT) is
left unconnected.
Figure 3 shows that pin 6 has no connection, which programs
the logic “M” state, due to the internal resistor divider network
90 MHz Reference Clock
VDD
8
1
5
Figure 3. Application Schematic
XIN/CLK
XOUT
SSCC
CY25561
VDD
VSS
3
2
of the CY25561. Programming a logic “0” state is as simple as
connecting to logic ground, as shown on pin 7 above.
With this configuration, the CY25561 will produce an SSCG
clock that is at a center frequency of 90 MHz. Referring to
Table 2, range “M, 0” at 90 MHz will generate a modulation
profile that has a 3.1% peak to peak spread.
C3
SSCLK
S0
S1
0.1 uF
N/C = Logic "M" state
7
4
6
VDD
CY25561
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