參數(shù)資料
型號(hào): 74HC297
廠商: NXP Semiconductors N.V.
英文描述: Digital phase-locked-loop filter
中文描述: 數(shù)字鎖相環(huán)回路濾波器
文件頁(yè)數(shù): 9/12頁(yè)
文件大?。?/td> 101K
代理商: 74HC297
September 1993
9
Philips Semiconductors
Product specification
Digital phase-locked-loop filter
74HC/HCT297
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard/bus driver
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+
25
40 to
+
85
40 to
+
125
min.
typ.
max.
min.
max.
min.
max.
t
PHL
/ t
PLH
propagation delay
I/D
CP
to I/D
OUT
50
18
14
44
16
13
61
22
18
14
5
4
19
7
6
175
35
30
160
32
27
220
44
37
60
12
10
75
15
13
220
44
37
200
40
34
275
55
47
75
15
13
95
19
16
265
53
45
240
48
41
330
66
56
90
18
15
110
22
19
ns
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Fig.11
t
PHL
/ t
PLH
propagation delay
φ
A
1
,
φ
B
to XORPD
OUT
propagation delay
φ
B,
φ
A
2
to ECPD
OUT
output transition time:
bus driver output;
I/D
OUT
(pin 7)
output transition time:
standard outputs;
XORPD
OUT
, ECPD
OUT
(pins 11, 12)
clock pulse width
K
CP
ns
Fig.12
t
PHL
/ t
PLH
ns
Fig.13
t
THL
/ t
TLH
ns
Fig.11
t
THL
/ t
TLH
ns
Fig.12 and 13
t
W
80
16
14
100
20
17
120
24
20
0
0
0
6.0
30
35
4.0
20
24
22
8
6
28
10
8
33
12
10
19
7
6
19
57
68
12
37
44
100
20
17
125
25
21
150
30
26
0
0
0
4.8
24
28
3.2
16
19
120
24
20
150
30
26
180
36
31
0
0
0
4.0
20
24
2.6
13
15
ns
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Fig.14
t
W
clock pulse width
I/D
CP
ns
Fig.11
t
su
set-up time
D/U, EN
CTR
to K
CP
ns
Fig.14
t
h
hold time
D/U, EN
CTR
to K
CP
ns
Fig.14
f
max
maximum clock pulse
frequency K
CP
MHz
Fig.14
f
max
maximum clock pulse
frequency I/D
CP
MHz
Fig.11
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