Datenblatt-Suchmaschine für elektronische Bauteile |
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CDC582PAH Datenblatt(PDF) 7 Page - Texas Instruments |
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CDC582PAH Datenblatt(HTML) 7 Page - Texas Instruments |
7 / 10 page CDC582 3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH DIFFERENTIAL LVPECL CLOCK INPUTS SCAS446B – JULY 1994 – REVISED FEBRUARY 1996 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 timing requirements over recommended ranges of supply voltage and operating free-air temperature MIN MAX UNIT f lk Clock frequency VCO is operating at four times the CLKIN/CLKIN frequency 25 50 MHz fclock Clock frequency VCO is operating at double the CLKIN/CLKIN frequency 50 100 MHz Input clock duty cycle 40% 60% † After SEL1, SEL0 50 Stabilization time† After OE ↓ 50 µs After power up 50 † Time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal. For phase lock to be obtained, a fixed-frequency, fixed-phase reference signal must be present at CLKIN. Until phase lock is obtained, the specifications for propagation delay and skew parameters given in the switching characteristics table are not applicable. switching characteristics over recommended ranges of supply voltage and operating free-air temperature, CL = 15 pF (see Note 4 and Figures 1, 2, and 3) PARAMETER FROM (INPUT) TO (OUTPUT) MIN MAX UNIT Duty cycle Y 45% 55% fmax 100 MHz Jitter(pk-pk) CLKIN ↑ Y ↑ 200 ps tphase error‡ CLKIN ↑ Y ↑ –500 500 ps tsk(o)‡ Y 0.5 ns tsk(pr)‡ Y 1 ns tr 1.4 ns tf 1.4 ns ‡ The propagation delay, tphase error, is dependent on the feedback path from any output to the FBIN. The tphase error, tsk(o), and tsk(pr) specifications are only valid for equal loading of all outputs. NOTE 4: The specifications for parameters in this table are applicable only after any appropriate stabilization time has elapsed. PARAMETER MEASUREMENT INFORMATION From Output Under Test LOAD CIRCUIT FOR OUTPUTS tphase error 2 V 2.4 V 1.6 V VOH VOL CLKIN 0.8 V 2 V tr tf 0.8 V 2 V 500 Ω CL = 30 pf (see Note A) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES Output 1.5 V CLKIN 2 V NOTES: A. CL includes probe and jig capacitance. B. The outputs are measured one at a time with one transition per measurement. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns. Figure 1. Load Circuit and Voltage Waveforms |
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