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參數資料
| 型號： | 74HC4020 |
| 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 |
| 中文描述： | 14位的二進制紋波計數器 |
| 文件頁數： | 2/7頁 |
| 文件大?。?/td> | 49K |
| 代理商： | 74HC4020 |
September 1993
2
Philips Semiconductors
Product specification
14-stage binary ripple counter
74HC/HCT4020
FEATURES
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT4020 are high-speed Si-gate CMOS
devices and are pin compatible with the “4020” of the
“4000B” series. They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT4020 are 14-stage binary ripple counters
with a clock input (CP), an overriding asynchronous
master reset input (MR) and twelve fully buffered parallel
outputs (Q
0
, Q
3
to Q
13
).
The counter is advanced on the HIGH-to-LOW transition of
CP.
A HIGH on MR clears all counter stages and forces all
outputs LOW, independent of the state of CP.
Each counter stage is a static toggle flip-flop.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL/
t
PLH
propagation delay
CP to Q
0
Q
n
to Q
n
+
1
MR to Q
n
maximum clock frequency
input capacitance
power dissipation capacitance per package
C
L
= 15 pF; V
CC
= 5 V
11
6
17
101
3.5
19
15
6
19
52
3.5
20
ns
ns
ns
MHz
pF
pF
f
max
C
I
C
PD
notes 1 and 2
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