參數(shù)資料
型號(hào): 74HCT1284DB-T
英文描述: 4-Bit Bus Transceiver
中文描述: 4位總線收發(fā)器
文件頁(yè)數(shù): 6/13頁(yè)
文件大?。?/td> 80K
代理商: 74HCT1284DB-T
1998 Sep 30
6
Philips Semiconductors
Product specification
Quad 2-input multiplexer; 3-state
74HC/HCT257
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
nI
0
nI
1
OE
S
0.40
0.40
1.35
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
nI
0
to nY
nI
1
to nY
t
PHL
/ t
PLH
propagation delay
S to nY
t
PZH
/ t
PZL
3-state output enable time
OE to nY
t
PHZ
/ t
PLZ
3-state output disable time
OE to nY
t
THL
/ t
TLH
output transition time
16
30
38
45
ns
4.5
Fig.6
20
35
44
53
ns
4.5
Fig.6
15
30
38
45
ns
4.5
Fig.7
16
30
38
45
ns
4.5
Fig.7
5
12
15
18
ns
4.5
Fig.6
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