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74HC297 Datenblatt(PDF) 10 Page - NXP Semiconductors

Teilenummer 74HC297
Bauteilbeschribung  Digital phase-locked-loop filter
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC297 Datenblatt(HTML) 10 Page - NXP Semiconductors

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September 1993
10
Philips Semiconductors
Product specification
Digital phase-locked-loop filter
74HC/HCT297
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard/bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (
∆I
CC) for
a unit load of 1 is given in the family specifications.
To determine
∆ICC per input, multiply this value by the unit
load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
ENCTR, D/U
0.3
A, B, C, D, KCP, φA2
0.6
I/DCP, φA1, φB
1.5
AC CHARACTERISTICS FOR 74HCT
GND = 0 V, tr =tf = 6 ns; CL = 50 pF
SYMBOL PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HCT
VCC
(V)
WAVEFORMS
+25
−40 to +85
−40 to +125
min.
typ.
max.
min.
max.
min.
max.
tPHL/ tPLH
propagation delay
I/DCP to I/DOUT
21
35
44
53
ns
4.5
Fig.11
tPHL/ tPLH
propagation delay
φA1, φB to XORPDOUT
16
32
40
48
ns
4.5
Fig.12
tPHL/ tPLH
propagation delay
φB, φA2 to ECPDOUT
22
44
55
66
ns
4.5
Fig.13
tTHL/ tTLH
output transition time
bus driver output
I/DOUT (pin 7)
5
12
15
18
ns
4.5
Fig.11
tTHL/ tTLH
output transition time
standard outputs
XORPDOUT, ECPDOUT
(pins 11, 12)
7
15
19
22
ns
4.5
Figs 12 and 13
tW
clock pulse width
KCP
16
8
20
24
ns
4.5
Fig.14
tW
clock pulse width
I/DCP
25
13
31
38
ns
4.5
Fig.11
tsu
set-up time
D/U, ENCTR to KCP
24
13
30
36
ns
4.5
Fig.14
th
hold time
D/U, ENCTR to KCP
0
−8
0
0
ns
4.5
Fig.14
fmax
maximum clock pulse
frequency KCP
30
62
24
20
MHz
4.5
Fig.14
fmax
maximum clock pulse
frequency I/DCP
20
36
16
13
MHz
4.5
Fig.11


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