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Электронный компонент: HD74HCT640

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HD74HCT640/HD74HCT643
Octal Bus Transceivers (with 3-state outputs)
Description
Both the HD74HCT640 and the HD74HCT643 have one active low enable input (
G), and a direction
control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is
low, data flows from B to A.
The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted
data from the A bus to the B bus and non-inverted data from the B bus to the A bus.
Features
LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
High Speed Operation: t
pd
(A to B) = 14.5 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 4.5 to 5.5 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max (Ta = 25C)
Function Table
Control Input
Operation
G
DIR
HD74HCT640
HD74HCT643
L
L
B
data to A bus
B data to A bus
L
H
A
data to B bus
A
data to B bus
H
X
Isolation
Isolation
HD74HCT640/HD74HCT643
2
Pin Arrangement
HD74HCT640
1
2
3
4
5
6
7
8
9
10
DIR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
V
CC
Enable
G
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
20
19
18
17
16
15
14
13
12
11
(Top view)
HD74HCT640/HD74HCT643
3
HD74HCT643
1
2
3
4
5
6
7
8
9
10
DIR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
V
CC
Enable
G
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
20
19
18
17
16
15
14
13
12
11
(Top view)
Block Diagram
HD74HCT640
V
CC
V
CC
G
DIR
A
To 7 other inverters
To 7 other inverters
B
HD74HCT640/HD74HCT643
4
HD74HCT643
V
CC
V
CC
G
DIR
A
To 7 other inverters
To 7 other inverters
B
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage range
V
CC
0.5 to +7.0
V
Input voltage
V
IN
0.5 to V
CC
+ 0.5
V
Output voltage
V
OUT
0.5 to V
CC
+ 0.5
V
DC current drain per pin
I
OUT
35
mA
DC current drain per V
CC
, GND
I
CC
, I
GND
75
mA
DC input diode current
I
IK
20
mA
DC output diode current
I
OK
20
mA
Power dissipation per package
P
T
500
mW
Storage temperature
Tstg
65 to +150
C
HD74HCT640/HD74HCT643
5
DC Characteristics
Ta = 25
C
Ta = 40 to
+85
C
Test Conditions
Item
Symbol
Min Typ Max Min
Max
Unit
V
CC
(V)
Input voltage
V
IH
2.0
--
--
2.0
--
V
4.5 to
5.5
V
IL
--
--
0.8
--
0.8
V
4.5 to
5.5
Output voltage
V
OH
4.4
--
--
4.4
--
V
4.5
Vin = V
IH
or V
IL
I
OH
= 20
A
4.18 --
--
4.13
--
4.5
I
OH
= 6 mA
V
OL
--
--
0.1
--
0.1
V
4.5
Vin = V
IH
or V
IL
I
OL
= 20
A
--
--
0.26 --
0.33
4.5
I
OL
= 6 mA
Off-state output
current
I
OZ
--
--
0.5 --
5.0
A
5.5
Vin = V
IH
or V
IL
,
Vout = V
CC
or GND
Input current
Iin
--
--
0.1 --
1.0
A
5.5
Vin = V
CC
or GND
Quiescent current
I
CC
--
--
4.0
--
40
A
5.5
Vin = V
CC
or GND, Iout = 0
A
AC Characteristics (C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25
C
Ta = 40 to
+85
C
Test Conditions
Item
Symbol
Min Typ Max Min
Max
Unit
V
CC
(V)
Propagation delay t
PLH
--
13
18
--
23
ns
4.5
time
t
PHL
--
16
18
--
23
4.5
Output enable
t
ZH
--
16
46
--
58
ns
4.5
time
t
ZL
--
16
46
--
58
4.5
Output disable
t
HZ
--
17
43
--
54
ns
4.5
time
t
LZ
--
21
43
--
54
4.5
Output rise/fall
time
t
TLH
t
THL
--
4
12
--
15
ns
4.5
Input capacitance
Cin
--
5
10
--
10
pF
--