CY25819SXCT Cypress Semiconductor Corp, CY25819SXCT Datasheet - Page 2

• Manufacturer Part Number: CY25819SXCT
• Description: IC,Miscellaneous Clock Generator,SOP,8PIN,PLASTIC
• Manufacturer: Cypress Semiconductor Corp
• Type: Clock/Frequency Synthesizer, Fanout Distribution, Frequency Modulator, Spread Spectrum Clock Generatorr

Specifications of CY25819SXCT

• Pll: Yes
• Input: Clock, Crystal, Resonator
• Output: Clock
• Number Of Circuits: 1
• Ratio - Input:output: 1:2
• Differential - Input:output: No/No
• Frequency - Max: 32MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.97 V ~ 3.63 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 32MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

.
Pin Description
Overview
The Cypress CY25819 products are Spread Spectrum Clock
Generator (SSCG) ICs used for the purpose of reducing EMI
found in today’s high-speed digital electronic systems. The
devices use a Cypress proprietary phase-locked loop (PLL) and
Spread Spectrum Clock (SSC) technology to synthesize and
modulate the frequency of the input clock. By frequency
modulating the clock, the measured EMI at the fundamental and
harmonic frequencies is greatly reduced. This reduction in
radiated energy can significantly reduce the cost of complying
with regulatory agency requirements and improve time to market
without degrading system performance.
The input frequency range is 8–16 MHz for the CY25818 and
16–32 MHz for the CY25819. Both products accept external
clock, crystal, or ceramic resonator inputs.
The CY25819 provide separate modulated (SSCLK) and
unmodulated reference (REFCLK) clock outputs which are the
same frequency as the input clock frequency. Down spread
frequency modulation can be selected by the user, based on
Table 2. Spread% Selection
Document #: 38-07362 Rev. *C
Pin
1
2
3
4
5
6
7
8
XIN (MHz)
16–20
20–24
24–28
28–32
XIN/CLK
REFCLK
SSCLK
Name
XOUT
PD#
Vdd
Vss
S0
Clock, Crystal, or Ceramic Resonator Input Pin.
Power Supply Ground.
Digital Spread% Control Pin. 3-Level input (H-M-L). Default = M.
Modulated Spread Spectrum Output Clock. The output frequency is referenced to input frequency. Refer
to
Unmodulated Reference Clock Output. The unmodulated output frequency is the same as the input
frequency.
Power Down Control Pin. Default = H (Vdd).
Positive Power Supply.
Clock, Crystal, or Ceramic Resonator Output Pin. Leave this pin unconnected if an external clock is
used at X
Table 2
IN
for the amount of modulation (Spread%).
CY25819
CY25819
CY25819
CY25819
Product
pin.
Down (%)
S0 = 1
–3.0
–2.7
–2.5
–2.3
Description
three discrete values of Spread%. A separate power down
function is also provided.
The CY25819 products are available in an 8-pin SOIC (150-mil)
package with a commercial operating temperature range of
0–70°C. Contact Cypress for availability of –40 to +85°C indus-
trial temperature range operation or TSSOP package versions.
Input Frequency Range and Selection
CY25819 input frequency range is 8–32 MHz. This range is
divided into two segments, as given in
Table 1. Input and Output Frequency Selection
Spread% Selection
CY25818/19 SSCG products provide Down-Spread frequency
modulation. The amount of Spread% is selected by using 3-Level
S0 digital input. Spread% values are given in
CY25819
Product
Down (%)
S0 = 0
–2.2
–1.9
–1.8
–1.7
Input/Output Frequency Range
16–32 MHz
Table
Down (%)
S0 = M
–0.7
–0.6
–0.6
–0.5
1.
Table
CY25819
2.
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