參數(shù)資料
型號: 74HCT4520
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 4-Bit Synchronous Up/Down Binary Counters 16-SOIC -40 to 85
中文描述: 雙4位同步二進(jìn)制計(jì)數(shù)器
文件頁數(shù): 6/7頁
文件大?。?/td> 55K
代理商: 74HCT4520
December 1990
6
Philips Semiconductors
Product specification
Dual 4-bit synchronous binary counter
74HC/HCT4520
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
0.80
1.50
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
n
propagation delay
nCP
1
to nQ
n
propagation delay
nMR to nQ
n
output transition time
28
53
66
80
ns
4.5
Fig.8
t
PHL
/ t
PLH
25
53
66
80
ns
4.5
Fig.8
t
PHL
16
35
44
53
ns
4.5
Fig.9
t
THL
/ t
TLH
7
15
19
22
ns
4.5
Fig.8
t
W
clock pulse width
HIGH or LOW
master reset pulse width
HIGH
removal time
nMR to nCP
0
; nCP
1
set-up time
nCP
1
to nCP
0
;
nCP
0
to nCP
1
maximum clock pulse
frequency
20
10
25
30
ns
4.5
Fig.7
t
W
20
12
25
30
ns
4.5
Fig.7
t
rem
0
8
0
0
ns
4.5
Fig.7
t
su
16
6
20
24
ns
4.5
Fig.8
f
max
30
58
24
20
MHz
4.5
Fig.7
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