參數(shù)資料
型號: 74HCT4020
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 14-stage binary ripple counter(14級二進(jìn)制紋波計數(shù)器)
中文描述: 14位的二進(jìn)制紋波計數(shù)器(14級二進(jìn)制紋波計數(shù)器)
文件頁數(shù): 6/7頁
文件大?。?/td> 49K
代理商: 74HCT4020
September 1993
6
Philips Semiconductors
Product specification
14-stage binary ripple counter
74HC/HCT4020
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
CP
MR
0.85
1.10
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
CP to Q
0
propagation delay
Q
n
to Q
n
+
1
propagation delay
MR to Q
n
output transition time
18
36
45
54
ns
4.5
Fig.7
t
PHL
/ t
PLH
8
15
19
22
ns
4.5
Fig.7
t
PHL
22
45
56
68
ns
4.5
Fig.8
t
THL
/ t
TLH
7
15
19
22
ns
4.5
Fig.7
t
W
clock pulse width
HIGH or LOW
master reset pulse width
HIGH
removal time
MR to CP
maximum clock pulse
frequency
20
7
25
30
ns
4.5
Fig.7
t
W
20
8
25
30
ns
4.5
Fig.8
t
rem
10
2
13
15
ns
4.5
Fig.8
f
max
25
47
20
17
MHz
4.5
Fig.7
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