Electronic Components Datasheet Search |
|
PCK12429A Datasheet(PDF) 8 Page - NXP Semiconductors |
|
PCK12429A Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 14 page Philips Semiconductors Product data PCK12429 25–400 MHz differential PECL clock generator 2002 Jun 03 8 AC CHARACTERISTICS (Tamb = 0 to 70 °C, VCC = 3.3 V ± 5%) SYMBOL PARAMETER TEST CONDITIONS LIMITS Tamb = 0 to +70 °C UNIT MIN MAX F Maximum Input Frequency S_CLOCK Note 1 — 10 MHz FMAXI Maximum Input Frequency Xtal Oscillator Note 1 10 20 MHz F O Maximum Output Frequency VCO (Internal) Note 2 200 400 MHz FMAXO Maximum Output Frequency FOUT Note 2 25 400 MHz tLOCK Maximum PLL Lock Time — 10 ms tjitter RMS jitter (peak-to-peak) Note 2 See Applications Section — ±25 ps S_DATA to S_CLOCK 20 — ts Setup Time S_CLOCK TO S_LOAD 20 — ns M, N to P_LOAD 20 — tn Hold Time S_DATA to S_CLOCK 20 — ns n M, N to P_LOAD 20 — tpw Minimum Pulse Width S_LOAD Note 2 50 — ns tpwMIN Minimum Pulse Width P_LOAD Note 2 50 — ns tr, tf Output Rise/Fall FOUT 20%–80%, Note 2 100 400 ps Duty Cycle 45 55 % NOTES: 1. 10 MHz is the maximum frequency to load the feedback device registers. S_CLOCK can be switched at higher frequencies when used as a test clock in TEST_MODE 6. Crystal frequency of 16MHz verified at productiontest. 10 to 20MHz operationguaranteed by design. 2. 50 Ω to VCC–2.0 V pulldown. APPLICATIONS INFORMATION Using the on-board crystal oscillator The PCK12429 features a fully integrated on-board crystal oscillator to minimize system implementation costs. The oscillator is a series resonant, multivibrator type design as opposed to the more common parallel resonant oscillator design. The series resonant design provides better stability and eliminates the need for large on chip capacitors. The oscillator is totally self contained so that the only external component required is the crystal. As the oscillator is somewhat sensitive to loading on its inputs, the user is advised to mount the crystal as close to the PCK12429 as possible to avoid any board level parasitics. To facilitate co-location surface mount crystals are recommended, but not required. Because the series resonant design is affected by capacitive loading on the XTAL terminals, loading variation introduced by crystals from different vendors could be a potential issue. The oscillator circuit is a series resonant circuit and thus for optimum performance a series resonant crystal should be used. Unfortunately most crystals are characterized in a parallel resonant mode. Fortunately there is no physical difference between a series resonant and a parallel resonant crystal. The difference is purely in the way the devices are characterized. As a result, a parallel resonant crystal can be used with the PCK12429 with only a minor error in the desired frequency. A parallel resonant mode crystal used in a series resonant circuit will exhibit a frequency of oscillation a few hundred ppm lower than specified, a few hundred ppm translates to kHz inaccuracies. In a general computer application this level of inaccuracy is immaterial. Table 2 specifies the performance requirements of the crystals to be used with the PCK12429. Table 2. Test modes PARAMETER VALUE Crystal Cut Fundamental AT Cut Resonance Series Resonance* Frequency Tolerance ±75 ppm at 25 °C Frequency/Temperature Stability ±150 pm 0 to 70 °C Operating Range 0 to 70 °C Shunt Capacitance 5–7 pF Equivalent Series Resistance (ESR) 50 to 80 Ω Correlation Drive Level 100 µW Aging 5 ppm/Yr (first 3 years) NOTE: * See accompanying text for series versus parallel resonant discussion. |
Similar Part No. - PCK12429A |
|
Similar Description - PCK12429A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |