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CD74ACT297 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 CD74ACT297
상세설명  DIGITAL PHASE-LOCKED LOOP
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CD74ACT297
DIGITAL PHASE-LOCKED LOOP
SCHS297D – AUGUST 1998 – REVISED JUNE 2002
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50% VCC
3 V
3 V
0 V
0 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Data Input
tPLH
tPHL
tPHL
tPLH
VOH
VOH
VOL
VOL
3 V
0 V
50% VCC
50% VCC
Input
Out-of-Phase
Output
In-Phase
Output
Timing Input
50% VCC
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
2
× VCC
500
500
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2
× VCC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
≈VCC
0 V
50% VCC
20% VCC
50% VCC
80% VCC
≈0 V
3 V
GND
Open
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2
× VCC
GND
TEST
S1
3 V
0 V
tw
VOLTAGE WAVEFORMS
INPUT RISE AND FALL TIMES AND PULSE DURATION
Input
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR
≤ 1 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
90%
90%
10%
10%
tf
tr
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
1.5 V
Figure 11. Load Circuit and Voltage Waveforms


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