dp83231 National Semiconductor Corporation, dp83231 Datasheet
dp83231
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dp83231 Summary of contents
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... TM (FDDI Clock Recovery Device) General Description The DP83231 CRD device is a clock recovery device that has been designed for use in 100 Mbps FDDI (Fiber Distrib- uted Data Interface) networks The device receives serial data from a Fiber Optic Receiver in differential ECL NRZI ...
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FDDI CHIP SET OVERVIEW 2 0 FUNCTIONAL DESCRIPTION 3 0 PIN DESCRIPTIONS 4 0 ELECTRICAL CHARACTERISTICS 4 1 Absolute Maximum Ratings 4 2 Recommended Operating Conditions Electrical Characteristics Electrical Characteristics Table of ...
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... National Semiconductor’s FDDI chip set consists of five components as shown in Figure 1-1 For more information about the other devices in the chip set consult the appropri- ate data sheets and application notes DP83231 CRD Device TM Clock Recovery Device The Clock Recovery Device extracts a 125 MHz clock from ...
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... Functional Description The DP83231 uses two phase locked loops (PLL’s) to per- form the clock recovery function The function of the first PLL is to establish a 250 MHz Voltage Controlled Oscillator (VCO) with a narrow frequency range which can be pulled by the second PLL The function of the second PLL is to ...
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... Functional Description 28-Pin PLCC Package Order Number DP83231AV See NS Package Number V28A FIGURE 2-2 DP83231 Pinout (Continued) FIGURE 2-1 DP83231 Block Diagram TL F 10384 – 2 FIGURE 2-3 System Connection Diagram 10384 – 10384 – 4 ...
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Pin Descriptions Symbol Pin DATA 8 I DATA 4B 5B serial NRZI data inputs originating from a fiber optic receiver and presented for g b the purpose of resynchronization and clock recovery These differential ...
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Pin Descriptions (Continued) Symbol Pin EXTV 28 External 10% relative to ground Bypass capacitors should be placed as close as possible across the g EXTV and EXTGND pins DV CC through chokes ...
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Electrical Characteristics ELECTRICAL CHARACTERISTICS Symbol Parameter V Input Clamp Voltage IC V High Level OH Output Voltage V Low Level OL Output Voltage I Max High Level I Input Current I High Level IH Input ...
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... Electrical Characteristics TYPICAL WAVEFORMS FIGURE 4-1 DP83231 Timing Waveforms (Continued) FIGURE 4-2 Typical Waveforms 10384 – 10384 – 6 ...
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Electrical Characteristics All component values g 5% (Continued) FIGURE 4-3 Synchronization Window FIGURE 4-4 General Wiring Diagram 10384 – 10384 – 8 ...
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Detailed Information 5 1 SPECIAL EXTERNAL COMPONENTS Crystals Manufacturer Nel Frequency Controls (414) 763-3591 Part C5400N Manufacturer Standard Crystal Corporation (818) 443-2121 Part 800R-A-10 41667-32 Key Specifications Center Frequency 10 41667 MHz Load Capacitance C 32 ...
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Detailed Information (Continued INPUT AND OUTPUT SCHEMATICS SD g DIF AMP VCO FLTR DATA TL F 10384 – 10384 – 13 OSCIN OSCOUT TL F 10384 – LBD g TL ...
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Detailed Information (Continued INPUT AND OUTPUT SCHEMATICS (Continued) CRD EN ELB RXC g RXD 10384 – 17 CLK DET TTLSD TL F 10384 – 19 Typical ESD Structure TL F 10384 – 21 ...
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... Detailed Information (Continued DEBUG PROCEDURE Evaluation of the DP83231 should begin by tying the CRD EN and TEST EN pins low and confirming that the SD pins are above 2V This will disable the differential phase comparator allowing the crystal resonator to run at its center frequency and will keep the part out of a test mode The first ...
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Detailed Information (Continued TEST CIRCUITS FIGURE 5-4 Switching Test Circuit for All TTL Output Signals FIGURE 5-5 Switching Test Circuit for All ECL Input and Output Signals TL F 10384 – ...
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... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Plastic Leaded Chip Carrier (V) Order Number DP83231AV NS Package Number V28A 2 A critical component is any component of a life ...