W181 Cypress Semiconductor, W181 Datasheet
W181
Available stocks
Related parts for W181
W181 Summary of contents
Page 1
... Spread Spectrum Output (EMI suppressed) CLKIN GND SS% CLKIN GND Spread Spectrum Output SS% (EMI suppressed) • 3901 North First Street • San Jose W181 W181-01, 02, 03 W181-51, 52, 53 Output Output – 0.625% in out in in 1.25% – 0.625 – ...
Page 2
... EMI reduction that is desired on the output signal. This pin has an internal pull-up resistor Power Connection: Connected to 3. power supply Ground Connection: Connect all ground pins to the com- mon system ground plane Connection W181 Pin Description ...
Page 3
... Overview The W181 products are one series of devices in the Cypress PREMIS family. The PREMIS family incorporates the latest advances in PLL spread spectrum frequency synthesizer tech- niques. By frequency modulating the output with a low- frequency carrier, peak EMI is greatly reduced. Use of this technology allows systems to pass increasingly difficult EMI testing without resorting to costly shielding or redesign ...
Page 4
... Cypress spreading pattern. Cypress does offer options with more spread and greater EMI reduction. Contact your local Sales representative for details on these devices. EMI Reduction Typical Clock Spread Spectrum Enabled Figure 3. Typical Modulation Profile 4 W181 Non- Spread Spectrum Frequency Span (MHz) Down Spread ...
Page 5
... V = 3.3V ± Test Condition First locked clock cycle after Power Good Note 1 Note 1 @ 0.4V 3. 2.4V 3.3V DD All pins except CLKIN CLKIN pin only 5 W181 Rating Unit –0.5 to +7.0 V –65 to +150 ° +70 °C –55 to +125 °C 0.5 W Min. Typ. Max. Unit 18 ...
Page 6
... V = 3.3V ±5% or 5V±10 Test Condition Input Clock Spread Off V , 15-pF load 0.8V–2. 15-pF load 2.4V–0.8V DD 15-pF load MHz, third harmonic out measured, reference board, 15-pF load 6 W181 Min. Typ. Max 0.15V DD 0.7V DD 0.4 2.4 –100 500 25 Min ...
Page 7
... Plastic SOIC (150-mil) X 14-pin Plastic TSSOP 7 connection can 0.1 µ µF Tantalum C1 = High frequency supply decoupling capacitor (0.1-µF recommended Common supply low frequency decoupling capacitor (10-µF tantalum recommended Match value to line impedance FB = Ferrite Bead G Via To GND Plane = G Clock Output R1 W181 ...
Page 8
... Package Diagram 14-pin Thin Shrink Small Outline Package 8 W181 ...
Page 9
... The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. W181 ...