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CD74ACT297M Folha de dados(PDF) 6 Page - Texas Instruments

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Nome de Peças CD74ACT297M
Descrição Electrónicos  DIGITAL PHASE-LOCKED LOOP
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CD74ACT297M Folha de dados(HTML) 6 Page - Texas Instruments

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CD74ACT297
DIGITAL PHASE-LOCKED LOOP
SCHS297A – AUGUST 1998 – REVISED SEPTEMBER 1999
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
φA2
Divide-By-K
Counter
Divide-By-N
Counter
Mfc
I/D Circuit
I/D OUT
I/D CLK
Carry
Borrow
K CLK
XORPD OUT
φB
fin, φin
2 Nfc
fout, φout
φA1
J
K
ECPD
ENCTR
D/U
Figure 3. DPLL Using Both Phase Detectors in a Ripple-Cancellation Scheme
absolute maximum ratings over recommended operating free-air temperature range (unless
otherwise noted)
Supply voltage range, VCC
–0.5 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC input diode current, IIK (VI < –0.5 V or VI > VCC + 0.5 V)
±20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC input diode current, IOK (VO < –0.5 V or VO > VCC + 0.5 V)
±50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC output source or sink current per output pin, IO (VO > –0.5 V or VO < VCC + 0.5 V)
±50 mA
. . . . . . . . . .
Continuous current through VCC or GND (Note 1)
±100 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
θJA (see Note 2)
73
°C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
–65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. For up to four outputs per device, add
±25 mA for each additional output.
2. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions
MIN
MAX
UNIT
VCC
Supply voltage
4.5
5.5
V
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.8
V
VI
Input voltage
0
VCC
V
VO
Output voltage
0
VCC
V
dt/dv
Input rise and fall slew rate
10
ns
TA
Operating free-air temperature range
–40
85
°C


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