DATA SHEET
Product specification
Supersedes data of 1999 Feb 24
File under Integrated Circuits, IC06
1999 Sep 28
INTEGRATED CIRCUITS
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
1999 Sep 28
2
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74AHC244; 74AHCT244
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
Balanced propagation delays
All inputs have a Schmitt-trigger
action
Inputs accepts voltages higher than
V
CC
For AHC only:
operates with CMOS input levels
For AHCT only:
operates with TTL input levels
Specified from
-
40 to +85 and +125
C.
DESCRIPTION
The 74AHC/AHCT244 is a
high-speed Si-gate CMOS device.
The 74AHC/AHCT244 is an octal
non-inverting buffer/line driver with
3-state outputs.
The 3-state outputs are controlled by
the outputs enable inputs 1OE and
2OE.
A HIGH on nOE causes the outputs to
assume a high-impedance OFF state.
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don't care;
Z = high-impedance OFF state.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
3.0 ns.
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W).
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
(C
L
V
CC
2
f
o
) = sum of outputs;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts.
2. The condition is V
I
= GND to V
CC
.
INPUTS
OUTPUT
nOE
nA
n
nY
n
L
L
L
L
H
H
H
X
Z
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC
AHCT
t
PHL
/t
PLH
propagation delay
1A
n
to 1Y
n
;
2A
n
to 2Y
n
C
L
= 15 pF;
V
CC
= 5 V
3.5
5.0
ns
C
I
input capacitance
V
I
= V
CC
or GND
3.5
3.5
pF
C
O
output capacitance
4.0
4.0
pF
C
PD
power dissipation
capacitance
C
L
= 50 pF;
f = 1 MHz;
notes 1 and 2
10
12
pF
1999 Sep 28
3
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74AHC244; 74AHCT244
PINNING
ORDERING INFORMATION
PIN
SYMBOL
DESCRIPTION
1
1OE
output enable input (active LOW)
2, 4, 6 and 8
1A
0
to 1A
3
data inputs
3, 5, 7 and 9
2Y
0
to 2Y
3
bus outputs
10
GND
ground (0 V)
11, 13, 15 and 17
2A
3
to 2A
0
data inputs
12, 14, 16 and 18
1Y
3
to 1Y
0
data outputs
19
2OE
output enable input (active LOW)
20
V
CC
DC supply voltage
OUTSIDE NORTH
AMERICA
NORTH AMERICA
PACKAGES
PINS
PACKAGE
MATERIAL
CODE
74AHC244D
74AHC244D
20
SO
plastic
SOT163-1
74AHC244PW
74AHC244PW DH
20
TSSOP
plastic
SOT360-1
74AHCT244D
74AHCT244D
20
SO
plastic
SOT163-1
74AHCT244PW
7AHCT244PW DH
20
TSSOP
plastic
SOT360-1
1999 Sep 28
5
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74AHC244; 74AHCT244
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134); voltages are referenced to GND (ground = 0 V).
Notes
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. For SO packages: above 70
C the value of P
D
derates linearly with 8 mW/K.
For TSSOP packages: above 60
C the value of P
D
derates linearly with 5.5 mW/K.
SYMBOL
PARAMETER
CONDITIONS
74AHC
74AHCT
UNIT
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
V
CC
DC supply voltage
2.0
5.0
5.5
4.5
5.0
5.5
V
V
I
input voltage
0
-
5.5
0
-
5.5
V
V
O
output voltage
0
-
V
CC
0
-
V
CC
V
T
amb
operating ambient temperature
range
see DC and AC
characteristics per
device
-
40
+25
+85
-
40
+25
+85
C
-
40
+25
+125
-
40
+25
+125
C
t
r
,t
f
(
t/
f) input rise and fall rates
V
CC
= 3.3 V
0.3 V
-
-
100
-
-
-
ns/V
V
CC
= 5 V
0.5 V
-
-
20
-
-
20
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX. UNIT
V
CC
DC supply voltage
-
0.5
+7.0
V
V
I
input voltage range
-
0.5
+7.0
V
I
IK
DC input diode current
V
I
<
-
0.5 V; note 1
-
-
20
mA
I
OK
DC output diode current
V
O
<
-
0.5 V or V
O
> V
CC
+ 0.5 V; note 1
-
20
mA
I
O
DC output source or sink current
-
0.5 V < V
O
< V
CC
+ 0.5 V
-
25
mA
I
CC
DC V
CC
or GND current
-
75
mA
T
stg
storage temperature range
-
65
+150
C
P
D
power dissipation per package
for temperature range:
-
40 to +125
C; note 2
-
500
mW
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