參數(shù)資料
型號(hào): 74HC244
廠商: NXP Semiconductors N.V.
英文描述: Octal buffer/line driver; 3-state
中文描述: 八路緩沖器/線路驅(qū)動(dòng)器,3態(tài)
文件頁(yè)數(shù): 6/7頁(yè)
文件大?。?/td> 39K
代理商: 74HC244
December 1990
6
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74HC/HCT244
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
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
1A
n
2A
n
1OE
2OE
0.70
0.70
0.70
0.70
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
1A
n
to 1Y
n;
2A
n
to 2Y
n
3-state output enable time
1OE to 1Y
n;
2OE to 2Y
n
3-state output disable time
1OE to 1Y
n;
2OE to 2Y
n
output transition time
13
22
28
33
ns
4.5
Fig.5
t
PZH
/ t
PZL
15
30
38
45
ns
4.5
Fig.6
t
PHZ
/ t
PLZ
15
25
31
38
ns
4.5
Fig.6
t
THL
/ t
TLH
5
12
15
18
ns
4.5
Fig.5
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