74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
Rev. 6 — 2 July 2020
Product data sheet
1. General description
The 74AHC244; 74AHCT244 is an 8-bit buffer/line driver with 3-state outputs. The device can be
used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE and
2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to assume
a high-impedance OFF-state. Inputs are overvoltage tolerant. This feature allows the use of these
devices as translators in mixed voltage environments.
2. Features and benefits
•
•
•
•
•
•
•
Wide supply voltage range from 2.0 V to 5.5 V
Balanced propagation delays
All inputs have Schmitt-trigger action
Overvoltage tolerant inputs to 5.5 V
High noise immunity
CMOS low power dissipation
Input levels:
•
For 74AHC244: CMOS level
•
For 74AHCT244: TTL level
ESD protection:
•
HBM JESD22-A114F exceeds 2000 V
•
MM JESD22-A115-A exceeds 200 V
•
CDM JESD22-C101E exceeds 1000 V
Latch-up performance exceeds 100 mA per JESD 78 Class II Level A
Multiple package options
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
•
•
•
•
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range
74AHC244D
74AHCT244D
74AHC244PW
74AHCT244PW
74AHC244BQ
74AHCT244BQ
-40 °C to +125 °C
-40 °C to +125 °C
TSSOP20
-40 °C to +125 °C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic thin shrink small outline package;
20 leads; body width 4.4 mm
Version
SOT163-1
SOT360-1
SOT764-1
DHVQFN20 plastic dual in-line compatible thermal
enhanced very thin quad flat package; no leads;
20 terminals; body 2.5 × 4.5 × 0.85 mm
Nexperia
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
4. Functional diagram
2
1A0
1Y0
18
4
1A1
1Y1
16
6
1A2
1Y2
14
8
1
1A3
1OE
1Y3
12
17
2A0
2Y0
3
15
2A1
2Y1
5
13
2A2
2Y2
7
11
19
2A3
2OE
2Y3
9
mna170
Fig. 1.
Functional diagram
1
EN
18
16
14
12
2
4
1A0
2
18
1Y0
2A0
17
3
2Y0
6
8
1A1
4
16
1Y1
2A1
15
5
2Y1
19
EN
9
7
5
3
mna873
1A2
6
14
1Y2
2A2
13
7
2Y2
11
13
15
17
1A3
1OE
8
1
12
1Y3
2A3
2OE
11
19
9
2Y3
mna874
Fig. 2.
Logic symbol
Fig. 3.
IEC logic symbol
74AHC_AHCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 6 — 2 July 2020
2 / 16
Nexperia
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
5. Pinning information
5.1. Pinning
74AHC244
74AHCT244
1OE
2
3
4
5
6
7
8
9
GND 10
2A3 11
GND
(1)
1
terminal 1
index area
1A0
2Y0
20 V
CC
19 2OE
18 1Y0
17 2A0
16 1Y1
15 2A1
14 1Y2
13 2A2
12 1Y3
74AHC244
74AHCT244
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
1
2
3
4
5
6
7
8
9
20 V
CC
19 2OE
18 1Y0
17 2A0
16 1Y1
15 2A1
14 1Y2
13 2A2
12 1Y3
11 2A3
001aae258
1A1
2Y1
1A2
2Y2
1A3
2Y3
001aah079
Transparent top view
GND 10
Fig. 4.
Pin configuration SOT163-1 (SO20) and
SOT360-1 (TSSOP20)
(1) This is not a ground pin. There is no electrical or
mechanical requirement to solder the pad. In case
soldered, the solder land should remain floating or
connected to GND.
Fig. 5.
Pin configuration SOT764-1 (DHVQFN20)
5.2. Pin description
Table 2. Pin description
Symbol
1OE, 2OE
1A0, 1A1, 1A2, 1A3
2A0, 2A1, 2A2, 2A3
1Y0, 1Y1, 1Y2, 1Y3
2Y0, 2Y1, 2Y2, 2Y3
GND
V
CC
Pin
1, 19
2, 4, 6, 8
17, 15, 13, 11
18, 16, 14, 12
3, 5, 7, 9
10
20
Description
output enable input (active LOW)
data input
data input
data output
data output
ground (0 V)
supply voltage
6. Functional description
Table 3. Function table
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
Control
nOE
L
H
Input
nAn
L
H
X
Output
nYn
L
H
Z
74AHC_AHCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 6 — 2 July 2020
3 / 16
Nexperia
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
V
I
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
[2]
Parameter
supply voltage
input voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
Conditions
Min
-0.5
-0.5
Max
+7.0
+7.0
-
±20
±25
75
-
+150
500
Unit
V
V
mA
mA
mA
mA
mA
°C
mW
V
I
< -0.5 V
V
O
< -0.5 V or V
O
> V
CC
+ 0.5 V
V
O
= -0.5 V to V
CC
+ 0.5 V
[1]
[1]
-20
-
-
-
-75
-65
T
amb
= -40 °C to +125 °C
[2]
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SOT163-1 (SO20) package: P
tot
derates linearly with 12.3 mW/K above 109 °C.
For SOT360-1 (TSSOP20) package: P
tot
derates linearly with 10.0 mW/K above 100 °C.
For SOT764-1 (DHVQFN20) package: P
tot
derates linearly with 12.9 mW/K above 111 °C.
8. Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
CC
V
I
V
O
T
amb
Δt/ΔV
supply voltage
input voltage
output voltage
ambient temperature
input transition rise and V
CC
= 3.3 V ± 0.3 V
fall rate
V
CC
= 5.0 V ± 0.5 V
Conditions
Min
2.0
0
0
-40
-
-
74AHC244
Typ
5.0
-
-
+25
-
-
Max
5.5
5.5
V
CC
+125
100
20
Min
4.5
0
0
-40
-
-
74AHCT244
Typ
5.0
-
-
+25
-
-
Max
5.5
5.5
V
CC
+125
-
20
V
V
V
°C
ns/V
ns/V
Unit
74AHC_AHCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 6 — 2 July 2020
4 / 16
Nexperia
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
9. Static characteristics
Table 6. Static characteristics
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
74AHC244
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 3.0 V
V
CC
= 5.5 V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V
V
CC
= 3.0 V
V
CC
= 5.5 V
V
OH
V
I
= V
IH
or V
IL
HIGH-level
output voltage
I
O
= -50 μA; V
CC
= 2.0 V
I
O
= -50 μA; V
CC
= 3.0 V
I
O
= -50 μA; V
CC
= 4.5 V
I
O
= -4.0 mA; V
CC
= 3.0 V
I
O
= -8.0 mA; V
CC
= 4.5 V
V
OL
V
I
= V
IH
or V
IL
LOW-level
output voltage
I
O
= 50 μA; V
CC
= 2.0 V
I
O
= 50 μA; V
CC
= 3.0 V
I
O
= 50 μA; V
CC
= 4.5 V
I
O
= 4.0 mA; V
CC
= 3.0 V
I
O
= 8.0 mA; V
CC
= 4.5 V
I
OZ
I
I
I
CC
C
I
C
O
OFF-state
V
I
= V
IH
or V
IL
;
output current V
O
= V
CC
or GND; V
CC
= 5.5 V
input leakage
current
V
I
= 5.5 V or GND;
V
CC
= 0 V to 5.5 V
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.58
3.94
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2.0
3.0
4.5
-
-
0
0
0
-
-
-
-
-
3.0
4.0
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.36
0.36
±0.25
0.1
4.0
10
-
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.48
3.8
-
-
-
-
-
-
-
-
-
-
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.44
0.44
±2.5
1.0
40
10
-
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.40
3.70
-
-
-
-
-
-
-
-
-
-
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.55
0.55
±10.0
2.0
80
10
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
μA
μA
μA
pF
pF
Conditions
Min
25 °C
Typ
Max
-40 °C to +85 °C -40 °C to +125 °C Unit
Min
Max
Min
Max
supply current V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 5.5 V
input
capacitance
output
capacitance
74AHC_AHCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 6 — 2 July 2020
5 / 16
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