INTRODUCTION Semiconductor, recognizing that companies need focus thei

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AND8120/D Comparison NBC12429 MC12429 Programmable Clock Synthesizers
INTRODUCTION Semiconductor, recognizing that companies need focus their engineering resources products instead re-engineering products already production, created direct drop-in replacements three Motorola clock synthesizers. Motorola recently announced their decision migrate MC12429, MC12430, MC12439 process. This migration means that existing customers will need complete evaluation Motorola's parts insure compatibility with existing designs. This paper presents side-by-side comparison specifications Semiconductor NBC12429 Motorola MC12429 time this paper written NBC12430 NBC12439 been released; however, they should also very similar their Motorola counterparts). Process Technology Motorola's MC12429 uses process called BIC75, which older BiCMOS process, while Motorola's part uses completely different SiGe process. control section EOL'ed MC12429 CMOS portion, heart chip, bipolar. Semiconductor decided create drop part using their highly successful MOSAIC (M5) process, same bipolar process that used produce some fastest available, ECLinPS Plus (see www.onsemi.com more details LVEP families). also decided create this part fully differential design decrease noise generation increase power supply rejection. Semiconductor could have produced this part SiGe well silicon bipolar approach made duplication existing critical timing much easier achieve.
Timing Comparison lower level, process technology good compare parts, real test comes performance comparison. Table compares some timing parameters parts. seen, silicon-based parts nearly identical, leading high confidence drop-in solution; same cannot said Motorola's SiGe part. Note that jitter performance Semiconductor part significantly better than Motorola parts. Figure shows both cycle-to-cycle jitter cycle-to-cycle peak-to-peak jitter silicon parts. only NBC12429 jitter significantly lower than MC12429, there also less jitter variation over range. When comes performance these data sheet specifications only tell part story. great deal engineering effort also expended most difficult attributes Motorola part duplicate, crystal oscillator loop dynamics. crystal oscillator very flexible; will accept medium high crystals from 10MHz 20MHz. Achieving this took several iterations, important drop-in replacement able operate equally well from reasonable crystal. replacement clock synthesizer should have engineer hunting crystal well. Loop dynamics characterized lock time (loop bandwidth) overshoot. Table contains laboratory measurements silicon devices (taken from several lots several date codes) showing closely they compare. Figures illustrate graphically that lock time overshoot very similar, with ringing. important note that both Table Figures depict very large frequency step, from 200MHz 400MHz.
Semiconductor Components Industries, LLC, 2003
May, 2003 Rev.
Publication Order Number: AND8120/D
AND8120/D
Table Specification Part Number NBC12429 Motorola MC12429 Motorola MPC9229
Package Supply Voltage Range Maximum Input Frequency, XTAL (MHz) Maximum Input Frequency, S_Clock (MHz) Output Frequency Range (MHz) Maximum Lock Time (ms) Jitter, Cycle Cycle, Peak-to-Peak (ps) Setup Time (ns) Hold Time (ns) Min/Max Rise/Fall Time (ps) Output Duty Cycle, Min/Max ICC, Including (mA)
28-Lead PLCC 32-Lead LQFP 3.3V 47.5/52.5 Table
28-Lead PLCC 32-Lead LQFP 3.3V Spec'ed
28-Lead PLCC 32-Lead LQFP 3.3V 45/55
Specification (Sample lot, 3.3V, 25C) Lock Time (ms) Overshoot Duty Cycle 200MHz/400MHz 200MHz/400MHz (ps) 200MHz/400MHz (ps)
NBC12429 1.09 1.25 50.1/49.6 293/296 319/297
Motorola MC12429 1.04 1.00 48.9/48.6 446/426 397/415
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AND8120/D
Jitter (ps) Jitter (ps)
Frequency (MHz)
Frequency (MHz)
Figure NBC12429 Cycle Cycle Jitter Frequency
Figure MC12429 Cycle Cycle Jitter Frequency
Jitter (ps) Frequency (MHz) Jitter (ps)
Frequency (MHz)
Figure NBC12429 Cycle Cycle Peak-Peak Jitter Frequency
Figure MC12429 Cycle Cycle Peak-Peak Jitter Frequency
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AND8120/D
Figure NBC12429
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AND8120/D
Figure MC12429
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AND8120/D
Conclusion order have high degree confidence drop-in solution, clock synthesizer must have both similar timing similar dynamics part replacing. NBC12429 compares very favorably MC12429 both counts, should require minimum engineering effort. NBC12429 produced Semiconductor's Phoenix, Arizona available today sample production quantities from your local distributor. NBC12429 available either PLCC (NBC12429FN) LQFP (NBC12429FA). more information click 2429,00.html.
Semiconductor registered trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer.
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AND8120/D

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