HD74HC244
Octal Buffers/Line Drivers/Line Receivers
(with noninverted 3-state outputs)
REJ03D0597–0200
(Previous ADE-205-474)
Rev.2.00
Jan 31, 2006
Description
The HD74HC244 is a non-inverting buffer and has two active low enables (1G and 2G). Each enable independently
controls 4 buffers.
This device does not have schmitt trigger inputs.
Features
•
•
•
•
•
•
High Speed Operation: t
pd
= 11 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: I
CC
(static) = 4 µA max (Ta = 25°C)
Ordering Information
Part Name
HD74HC244P
HD74HC244FPEL
HD74HC244RPEL
HD74HC244TELL
Package Type
DILP-20 pin
SOP-20 pin (JEITA)
SOP-20 pin (JEDEC)
TSSOP-20 pin
Package Code
(Previous Code)
PRDP0020AC-B
(DP-20NEV)
PRSP0020DD-B
(FP-20DAV)
PRSP0020DC-A
(FP-20DBV)
PTSP0020JB-A
(TTP-20DAV)
Package
Abbreviation
P
FP
RP
T
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
ELL(2,000 pcs/reel)
Taping Abbreviation
(Quantity)
Note: Please consult the sales office for the above package availability.
Function Table
Inputs
G
H
L
L
H
L
X
Z
:
:
:
:
high level
low level
irrelevant
off (high-impedance) state of a 3-state output
A
X
H
L
Output
Y
Z
H
L
Rev.2.00 Jan 31, 2006 page 1 of 7
HD74HC244
Pin Arrangement
1G
1
1A
1
2Y
4
1A
2
2Y
3
1A
3
2Y
2
1A
4
2Y
1
1
2
3
4
5
6
7
8
9
20 V
CC
19 2G
18 1Y
1
17 2A
4
16 1Y
2
15 2A
3
14 1Y
3
13 2A
2
12 1Y
4
11 2A
1
(Top view)
GND 10
Logic Diagram
To three other
7 inverters
One of 8
inverters
V
CC
Input A
Y
Strobe
G
Rev.2.00 Jan 31, 2006 page 2 of 7
HD74HC244
Absolute Maximum Ratings
Item
Supply voltage range
Input / Output voltage
Input / Output diode current
Output current
V
CC
, GND current
Power dissipation
Storage temperature
Symbol
V
CC
V
IN
, V
OUT
I
IK
, I
OK
I
O
I
CC
or I
GND
P
T
Tstg
Ratings
–0.5 to 7.0
–0.5 to V
CC
+0.5
±20
±35
±75
500
–65 to +150
Unit
V
V
mA
mA
mA
mW
°
C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Recommended Operating Conditions
Item
Supply voltage
Input / Output voltage
Operating temperature
Input rise / fall time
*1
Symbol
V
CC
V
IN
, V
OUT
Ta
t
r
, t
f
Ratings
2 to 6
0 to V
CC
–40 to 85
0 to 1000
0 to 500
0 to 400
Unit
V
V
°
C
ns
Conditions
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Item
Input voltage
Symbol V
CC
(V)
V
IH
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
6.0
Ta = 25°C
Min
Typ Max
1.5
—
—
3.15
—
—
4.2
—
—
—
—
0.5
—
—
1.35
—
1.9
4.4
5.9
4.18
5.68
—
—
—
—
—
—
—
—
—
2.0
4.5
6.0
—
—
0.0
0.0
0.0
—
—
—
—
—
1.8
—
—
—
—
—
0.1
0.1
0.1
0.26
0.26
±0.5
±0.1
4.0
Ta = –40 to+85°C Unit
Min
Max
1.5
—
V
3.15
—
4.2
—
—
0.5
V
—
1.35
—
1.9
4.4
5.9
4.13
5.63
—
—
—
—
—
—
—
—
1.8
—
—
—
—
—
0.1
0.1
0.1
0.33
0.33
±5.0
±1.0
40
V
Test Conditions
V
IL
Output voltage
V
OH
Vin = V
IH
or V
IL
I
OH
= –20
µA
I
OH
= –6 mA
I
OH
= –7.8 mA
V
Vin = V
IH
or V
IL
I
OL
= 20
µA
V
OL
I
OL
= 6 mA
I
OL
= 7.8 mA
µA
µA
µA
Vin = V
IH
or V
IL
,
Vout = V
CC
or GND
Vin = V
CC
or GND
Vin = V
CC
or GND, Iout = 0
µA
Off-state output
current
Input current
Quiescent supply
current
I
OZ
Iin
I
CC
Rev.2.00 Jan 31, 2006 page 3 of 7
HD74HC244
Switching Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Item
Propagation delay
time
Symbol V
CC
(V)
t
PHL
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
—
Ta = 25°C
Min
Typ Max
—
—
90
—
12
18
—
—
15
—
—
90
—
10
18
—
—
15
—
—
150
—
11
30
—
—
26
—
—
150
—
12
30
—
—
26
—
—
150
—
16
30
—
—
26
—
—
150
—
—
—
—
—
—
19
—
—
4
—
5
30
26
60
12
10
10
Ta = –40 to +85°C
Unit
Min
Max
—
115
ns
—
23
—
20
—
115
ns
—
23
—
20
—
190
ns
—
38
—
33
—
190
ns
—
38
—
33
—
190
ns
—
38
—
33
—
190
ns
—
—
—
—
—
—
38
33
75
15
13
10
Test Conditions
t
PLH
Output enable time
t
ZL
t
ZH
Output disable
time
t
LZ
t
HZ
Output rise/fall
time
Input capacitance
t
TLH
t
THL
Cin
ns
pF
Test Circuit
V
CC
V
CC
1G, 2G
See Function Table
Output
1 k
Ω
S1
OPEN
GND
Input
Pulse Generator
Z
out
= 50
Ω
1Y1 to 2Y4
1A1 to 2A4
C
L
=
50 pF
V
CC
TEST
t
PLH
/ t
PHL
t
ZH
/ t
HZ
t
ZL
/ t
LZ
S1
OPEN
GND
V
CC
Note : 1. C
L
includes probe and jig capacitance.
Rev.2.00 Jan 31, 2006 page 4 of 7
HD74HC244
Waveforms
•
Waveform – 1
t
r
90 %
50 %
10 %
t
PLH
90 %
Output Y
50 %
10 %
t
TLH
90 %
50 %
10 %
t
PHL
90 %
50 %
10 %
t
THL
t
f
V
CC
0V
Input A
V
OH
V
OL
•
Waveform – 2
90 %
Input G
t
f
t
r
90 %
50 %
10 %
t
LZ
V
CC
0V
V
OH
50 %
10 %
t
ZL
Waveform – A
t
ZH
Waveform – B
50 %
10 %
t
HZ
90 %
V
OL
V
OH
V
OL
50 %
Notes : 1. Input waveform : PRR
≤
1 MHz, duty cycle 50%, t
r
≤
6 ns, t
f
≤
6 ns
2. Waveform– A is for an output with internal conditions such that the
output is low except when disabled by the output control.
3. Waveform– B is for an output with internal conditions such that the
output is high except when disabled by the output control.
4. The output are measured one at a time with one transition per measurement.
Rev.2.00 Jan 31, 2006 page 5 of 7
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