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CD74HC297 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce CD74HC297
Description  High-Speed CMOS Logic Digital Phase-Locked-Loop
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

CD74HC297 Fiches technique(HTML) 8 Page - Texas Instruments

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FIGURE 1. DPLL USING BOTH PHASE DETECTORS IN A RIPPLE-CANCELLATION SCHEME
FIGURE 2. DPLL USING EXCLUSIVE-OR PHASE DETECTION
FIGURE 3. TIMING DIAGRAM: I/DOUT IN-LOCK CONDITION
DIVIDE-BY-K
COUNTER
ENCTR
KCP
D/U
CARRY
BORROW
XORPDOUT
JJ
ECPD
K
FF
ECPDOUT
φA
1
φB
φA
2
DIVIDE-BY-N
COUNTER
I/DOUT
I/DCP
I/D CIRCUIT
2NfC
MfC
fOUT
φ
OUT
fIN
φ
IN
DIVIDE-BY-K
COUNTER
KCP
D/U
CARRY
BORROW
XORPDOUT
φA
1
φB
DIVIDE-BY-N
COUNTER
I/DOUT
I/DCP
I/D CIRCUIT
2NfC
MfC
fOUT
φ
IN
fOUT
φ
OUT
CARRY PULSE
(INTERNAL SIGNAL)
BORROW PULSE
(INTERNAL SIGNAL)
I/DCP INPUT
I/DOUT OUTPUT
CD74HC297, CD74HCT297
CD74HC297, CD74HCT297


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