參數(shù)資料
型號(hào): 74HC259
廠商: NXP Semiconductors N.V.
英文描述: 8-bit addressable latch
中文描述: 8位可尋址鎖存器
文件頁(yè)數(shù): 7/11頁(yè)
文件大?。?/td> 87K
代理商: 74HC259
December 1990
7
Philips Semiconductors
Product specification
8-bit addressable latch
74HC/HCT259
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard
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
D to Q
n
58
21
17
58
21
17
55
20
16
50
18
14
19
7
6
17
6
5
17
6
5
19
7
6
19
6
5
11
4
3
185
37
31
185
37
31
170
34
29
155
31
26
75
15
13
230
46
39
230
46
39
215
43
37
195
39
33
95
19
16
280
56
48
280
56
48
255
51
43
235
47
40
119
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
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.7
t
PHL
/ t
PLH
propagation delay
A
n
to Q
n
ns
Fig.8
t
PHL
/ t
PLH
propagation delay
LE to Q
n
ns
Fig.6
t
PHL
propagation delay
MR to Q
n
ns
Fig.9
t
THL
/ t
TLH
output transition time
ns
Figs 6 and 7
t
W
LE pulse width
HIGH or LOW
70
14
12
70
14
12
80
16
14
0
0
0
2
2
2
90
18
15
90
18
15
100
20
17
0
0
0
2
2
2
105
21
18
105
21
18
120
24
20
0
0
0
2
2
2
ns
Fig.6
t
W
MR pulse width
LOW
ns
Fig.9
t
su
set-up time
D, A
n
to LE
ns
Figs 10 and 11
t
h
hold time
D to LE
ns
Fig.10
t
h
hold time
A
n
to LE
ns
Fig.11
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