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PDF 74HCT297 Data sheet ( Hoja de datos )
| Número de pieza | 74HCT297 | |
| Descripción | Digital phase-locked-loop filter | |
| Fabricantes | Philips | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT297
Digital phase-locked-loop filter
Product specification
File under Integrated Circuits, IC06
September 1993
1 page  
Philips Semiconductors
Digital phase-locked-loop filter
Product specification
74HC/HCT297
Fig.4 Functional diagram.
K-COUNTER (DIGITAL CONTROL) FUNCTION TABLE
D C B A MODULO (K)
L LLL
L LLH
L LHL
L LHH
L HLL
L HLH
L HHL
L HHH
H LLL
H LLH
H LHL
H LHH
H HLL
H HLH
H HHL
H HHH
inhibited
23
24
25
26
27
28
29
210
211
212
213
214
215
216
217
EXCLUSIVE-OR PHASE DETECTOR FUNCTION
TABLE
φA1 φB
LL
LH
HL
HH
XORPDOUT
L
H
H
L
EDGE-CONTROLLED PHASE DETECTOR TABLE
φA2
H or L
↓
H or L
↑
φB
↓
H or L
↑
H or L
ECPDOUT
H
L
no change
no change
Notes
1. H = HIGH voltage level
L = LOW voltage level
↓ = HIGH-to-LOW transition
↑ = LOW-to-HIGH transition
September 1993
5
5 Page 
Philips Semiconductors
Digital phase-locked-loop filter
AC WAVEFORMS
Product specification
74HC/HCT297
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.11 Waveforms showing the clock (I/DCP) to output (I/DOUT) propagation delays, the clock pulse width, output
transition times and maximum clock pulse frequency.
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.12 Waveforms showing the phase input (φB, φA1) to output (XORPDOUT) propagation delays and output
transition times.
September 1993
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 74HCT297.PDF ] | |
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