HD74AC244/HD74ACT244
Octal Buffer/Line Driver with 3-State Output
REJ03D0262–0200Z
(Previous ADE-205-383 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74AC244/HD74ACT244 is an octal buffer and line driver designed to be employed as a memory address driver,
clock driver and bus-oriented transmitter/receive which provides improved PC board density.
Features
•
3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
•
Outputs Source/Sink 24 mA
•
HD74ACT244 has TTL-Compatible Inputs
•
Ordering Information: Ex. HD74AC244
Part Name
HD74AC244P
HD74AC244FPEL
HD74AC244RPEL
HD74AC244TELL
Package Type
DIP-20 pin
SOP-20 pin (JEITA)
TSSOP-20 pin
Package Code Package Abbreviation Taping Abbreviation (Quantity)
DP-20N, -20NEV P
FP-20DAV
TTP-20DAV
FP
RP
T
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
ELL (2,000 pcs/reel)
SOP-20 pin (JEDEC) FP-20DBV
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Pin Arrangement
OE1
1
1A
1
2
2Y
4
3
1A
2
4
2Y
3
5
1A
3
6
2Y
2
7
1A
4
8
2Y
1
9
GND 10
(Top view)
20 V
CC
19
OE2
18 1Y
1
17 2A
4
16 1Y
2
15 2A
3
14 1Y
3
13 2A
2
12 1Y
4
11 2A
1
Rev.2.00, Jul.16.2004, page 1 of 8
HD74AC244/HD74ACT244
Truth Tables
Inputs
OE
1
L
L
H
Inputs
OE
2
L
L
H
H
L
X
Z
:
:
:
:
High Voltage Level
Low Voltage Level
Immaterial
High Impedance
L
H
X
A
L
H
Z
L
H
X
A
L
H
Z
Outputs (Pins 3, 5, 7, 9)
Y
Outputs (Pins 12, 14, 16, 18)
Y
Absolute Maximum Ratings
Item
Supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage
DC output source or sink current
DC V
CC
or ground current per output pin
Storage temperature
Symbol
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
CC
, I
GND
Tstg
Ratings
–0.5 to 7
–20
20
–0.5 to Vcc+0.5
–50
50
–0.5 to Vcc+0.5
±50
±50
–65 to +150
Unit
V
mA
mA
V
mA
mA
V
mA
mA
°C
Condition
V
I
= –0.5V
V
I
= Vcc+0.5V
V
O
= –0.5V
V
O
= Vcc+0.5V
Recommended Operating Conditions: HD74AC244
Item
Supply voltage
Input and Output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
30% to 70% V
CC
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 3.0V
V
CC
= 4.5 V
V
CC
= 5.5 V
Unit
Condition
Rev.2.00, Jul.16.2004, page 2 of 8
HD74AC244/HD74ACT244
DC Characteristics: HD74AC244
Item
Sym-
bol
V
IH
Vcc
(V)
3.0
4.5
5.5
V
IL
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
V
OL
5.5
3.0
4.5
5.5
3.0
4.5
Input leakage
current
3 State current
I
IN
I
OZ
5.5
5.5
5.5
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.58
3.94
4.94
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
2.25
2.75
1.50
2.25
2.75
2.99
4.49
5.49
—
—
—
0.002
0.001
0.001
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.32
0.32
0.32
±0.1
±0.5
Ta = –40 to
+85°C
°
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.48
3.80
4.80
—
—
—
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.37
0.37
0.37
±1.0
±5.0
µA
µA
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Unit
Condition
Input Voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Output voltage
V
OH
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
or V
IH
I
OH
= –12 mA
I
OH
= –24 mA
I
OH
= –24 mA
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
or V
IH
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA
V
IN
= V
CC
or GND
V
IN(OE)
= V
IL
, V
IH
V
IN
= V
CC
or GND
V
OUT
= V
CC
or GND
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
Dynamic output
current*
Quiescent supply
current
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
—
—
—
—
—
—
—
—
8.0
86
–75
—
—
—
80
mA
mA
µA
*Maximum
test duration 2.0 ms, one output loaded at a time.
Recommended Operating Conditions: HD74ACT244
Item
Supply voltage
Input and output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
0.8 to 2.0 V
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 4.5V
V
CC
= 5.5V
Unit
Condition
Rev.2.00, Jul.16.2004, page 3 of 8
HD74AC244/HD74ACT244
DC Characteristics: HD74ACT244
Item
Sym-
bol
V
IH
V
IL
Output voltage
V
OH
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
V
OL
5.5
4.5
5.5
4.5
Input current
3 State current
I
CC
/input current
Dynamic output
current*
Quiescent supply
current
I
IN
I
OZ
I
CCT
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
5.5
5.5
5.5
5.5
min.
2.0
2.0
—
—
4.4
5.4
3.94
4.94
—
—
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
1.5
1.5
1.5
4.49
5.49
—
—
0.001
0.001
—
—
—
—
0.6
—
—
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.32
0.32
±0.1
±0.5
—
—
—
8.0
Ta = –40 to
+85°C
°
min.
2.0
2.0
—
—
4.4
5.4
3.80
4.80
—
—
—
—
—
—
—
86
–75
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.37
0.37
±1.0
±5.0
1.5
—
—
80
µA
µA
mA
mA
mA
µA
V
Unit
Condition
Input voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
V
IN
= V
CC
or GND
V
IN
= V
IL
, V
IH
V
OUT
= V
CC
or GND
V
IN
= V
CC
–2.1 V
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
I
OL
= 24 mA
I
OL
= 24 mA
I
OH
= –24 mA
I
OH
= –24 mA
*Maximum
test duration 2.0 ms, one output loaded at a time.
AC Characteristics: HD74AC244
Ta = +25°C
C
L
= 50 pF
Min
Typ
Max
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
6.5
5.0
6.5
5.0
6.0
5.0
7.5
5.5
7.0
6.5
7.5
6.5
9.0
7.0
9.0
7.0
10.5
7.0
10.0
8.0
10.0
9.0
10.5
9.0
Ta = –40°C to +85°C
C
L
= 50 pF
Min
Max
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
10.0
7.5
10.0
7.5
11.0
8.0
11.0
8.5
10.5
9.5
11.5
9.5
ns
ns
ns
ns
ns
ns
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
V
CC
(V)*
1
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Unit
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Rev.2.00, Jul.16.2004, page 4 of 8
HD74AC244/HD74ACT244
AC Characteristics: HD74ACT244
Ta = +25°C
C
L
= 50 pF
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
V
CC
(V)*
1
Min
5.0
1.0
5.0
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
1.0
Typ
6.5
7.0
6.0
7.0
7.0
7.5
Max
9.0
9.0
8.5
9.5
9.5
10.0
Ta = –40°C to +85°C
C
L
= 50 pF
Min
1.0
1.0
1.0
1.0
1.0
1.0
Max
10.0
10.0
9.5
10.5
10.5
10.5
Unit
ns
ns
ns
ns
ns
ns
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Input capacitance
Power dissipation capacitance
Symbol
C
IN
C
PD
4.5
45.0
Typ
pF
pF
Unit
V
CC
= 5.5 V
V
CC
= 5.0 V
Condition
Rev.2.00, Jul.16.2004, page 5 of 8
Industrial Control Electronics
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