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CD74HC297 Datasheet, PDF (10/15 Pages) Texas Instruments – High-Speed CMOS Logic Digital Phase-Locked-Loop
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CD54HC297, CD74HC297, CD74HCT297
øB INPUT VS
øA2 INPUT
VS
ECPDOUT
VS
OUTPUT
tPHL
tPLH
tTHL
tTLH
FIGURE 8. WAVEFORMS SHOWING THE PHASE INPUT (øB, øA2) TO OUTPUT (ECPDOUT) PROPAGATION DELAYS AND OUTPUT
TRANSITION TIMES
tH
tH
D/U, ENCTR
INPUT
tSU
KCP INPUT
VS
tSU
VS
tW
1/fMAX
NOTE: The shaded areas indicate when the input is permitted to change for predictable output performance.
FIGURE 9. WAVEFORMS SHOWING THE CLOCK (KCP) PULSE WIDTH AND MAXIMUM CLOCK PULSE FREQUENCY, AND THE
INPUT (D/U, ENCTR) TO CLOCK (KCP) SETUP AND HOLD TIMES
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