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CD74ACT297 Datasheet, PDF (6/12 Pages) Texas Instruments – DIGITAL PHASE-LOCKED LOOP | |||
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CD74ACT297
DIGITAL PHASE-LOCKED LOOP
SCHS297A â AUGUST 1998 â REVISED SEPTEMBER 1999
Mfc
fout, Ïout
K CLK
D/U
ENCTR
XORPD OUT
ÏA1
ÏB
Divide-By-K
Counter
Carry
Borrow
fin, Ïin
J
ECPD
ÏA2
K
I/D OUT
I/D CLK
I/D Circuit
2 Nfc
Divide-By-N
Counter
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)â
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . â0.5 V to 6 V
DC input diode current, IIK (VI < â0.5 V or VI > VCC + 0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
DC input diode current, IOK (VO < â0.5 V or VO > VCC + 0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
DC output source or sink current per output pin, IO (VO > â0.5 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . â65°C to 150°C
â Stresses beyond those listed under âabsolute maximum ratingsâ 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 ârecommended operating conditionsâ 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
VCC
VIH
VIL
VI
VO
dt/dv
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
Output voltage
Input rise and fall slew rate
Operating free-air temperature range
MIN MAX UNIT
4.5 5.5 V
2
V
0.8 V
0 VCC V
0 VCC V
10 ns
â40
85 °C
6
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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