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參數(shù)資料
| 型號(hào)： | 74HCT390 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | Dual decade ripple counter(雙十進(jìn)制紋波計(jì)數(shù)器) |
| 中文描述： | 雙十年紋波計(jì)數(shù)器（雙十進(jìn)制紋波計(jì)數(shù)器） |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大小： | 49K |
| 代理商： | 74HCT390 |
December 1990
6
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard
I
CC
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
I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
INPUT
UNIT LOAD COEFFICIENT
nCP
0
nCP
1
, nMR
0.45
0.60
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+
25
40 to
+
85
40 to
+
125
min.
typ.
max. min. max. min.
max.
t
PHL
/ t
PLH
propagation delay
nCP
0
to nQ
0
propagation delay
nCP
1
to nQ
1
propagation delay
nCP
1
to nQ
2
propagation delay
nCP
1
to nQ
3
propagation delay
nMR to nQ
n
output transition time
21
34
43
51
ns
4.5
Fig.6
t
PHL
/ t
PLH
22
38
48
57
ns
4.5
Fig.6
t
PHL
/ t
PLH
30
51
64
77
ns
4.5
Fig.6
t
PHL
/ t
PLH
22
38
48
57
ns
4.5
Fig.6
t
PHL
21
36
45
54
ns
4.5
Fig.7
t
THL
/ t
TLH
7
15
19
22
ns
4.5
Fig.6
t
W
clock pulse width
nCP
0
, nCP
1
master reset pulse width
HIGH
removal time
nMR to nCP
n
maximum clock pulse
frequency
nCP
0
, nCP
1
18
8
23
27
ns
4.5
Fig.6
t
W
17
10
21
26
ns
4.5
Fig.7
t
rem
15
8
19
22
ns
4.5
Fig.7
f
max
27
55
22
18
MHz
4.5
Fig.6
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