CD74HC297 Datasheet, PDF (9/15 Pages) Texas Instruments – High-Speed CMOS Logic Digital Phase-Locked-Loop

CD54HC297, CD74HC297, CD74HCT297
øB INPUT
øA₂ INPUT
ECPD_OUT OUTPUT
FIGURE 4. TIMING DIAGRAM: EDGE CONTROLLED PHASE COMPARATOR WAVEFORMS
øB INPUT
øA₁ INPUT
XORPD_OUT OUTPUT
FIGURE 5. TIMING DIAGRAM: EXCLUSIVE OR PHASE DETECTOR WAVEFORMS
I/D_CP
t_PLH
I/D_OUT
t_TLH
t_W
V_S
I/f_MAX
t_PHL
V_S
t_THL
FIGURE 6. WAVEFORMS SHOWING THE CLOCK (I/D_CP) TO OUTPUT (I/D_OUT) PROPAGATION DELAYS, CLOCK PULSE WIDTH,
OUTPUT TRANSITION TIMES AND MAXIMUM CLOCK PULSE FREQUENCY
V_S
øB INPUT
øA₁ INPUT
XORPD_OUT
OUTPUT
t_PLH
V_S
V_S
t_PLH
t_TLH
t_PLH
t_THL
t_PHL
FIGURE 7. WAVEFORMS SHOWING THE PHASE INPUT (øB, øA₁) TO OUTPUT (XORPD_OUT) PROPAGATION DELAYS AND
OUTPUT TRANSITION TIMES
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