74HC244; 74HCT244
Octal buffer/line driver; 3-state
Rev. 6 — 27 September 2019
Product data sheet
1. General description
The 74HC244; 74HCT244 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 include clamp diodes that enable the use of current limiting
resistors to interface inputs to voltages in excess of V
CC
.
2. Features and benefits
•
Input levels:
•
For 74HC244: CMOS level
•
For 74HCT244: TTL level
Octal bus interface
Non-inverting 3-state outputs
Complies with JEDEC standard no. 7 A
ESD protection:
•
HBM JESD22-A114F exceeds 2000 V
•
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from -40 °C to +85 °C and -40 °C to +125 °C
•
•
•
•
•
•
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range
74HC244D
74HCT244D
74HC244DB
74HCT244DB
74HC244PW
74HCT244PW
74HC244BQ
74HCT244BQ
-40 °C to +125 °C
-40 °C to +125 °C
TSSOP20
-40 °C to +125 °C
SSOP20
-40 °C to +125 °C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic thin shrink small outline package;
20 leads; body width 4.4 mm
Version
SOT163-1
SOT339-1
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
74HC244; 74HCT244
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
mna875
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
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 27 September 2019
2 / 16
Nexperia
74HC244; 74HCT244
Octal buffer/line driver; 3-state
5. Pinning information
5.1. Pinning
74HC244
74HCT244
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
74HC244
74HCT244
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
001aae011
1A1
2Y1
1A2
2Y2
1A3
2Y3
001aae012
Transparent top view
GND 10
Fig. 4.
Pin configuration SOT163-1 (SO20),
SOT339-1 (SSOP20) 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
2Y0, 2Y1, 2Y2, 2Y3
GND
2A0, 2A1, 2A2, 2A3
1Y0, 1Y1, 1Y2, 1Y3
V
CC
Pin
1, 19
2, 4, 6, 8
3, 5, 7, 9
10
17, 15, 13, 11
18, 16, 14, 12
20
Description
output enable input (active LOW)
data input
bus output
ground (0 V)
data input
bus output
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.
Input
nOE
L
L
H
nAn
L
H
X
Output
nYn
L
H
Z
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 27 September 2019
3 / 16
Nexperia
74HC244; 74HCT244
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 Parameter
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
Conditions
V
I
< -0.5 V or V
I
> V
CC
+ 0.5 V
V
O
< -0.5 V or V
O
> V
CC
+ 0.5 V
-0.5 V < V
O
< V
CC
+ 0.5 V
Min
-0.5
-
-
-
-
-70
-65
[1]
-
Max
+7
±20
±20
±35
70
-
+150
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
For SOT163-1 (SO20) packages: P
tot
derates linearly with 12.3 mW/K above 109 °C.
For SOT339-1 (SSOP20) packages: P
tot
derates linearly with 10.0 mW/K above 100 °C.
For SOT360-1 (TSSOP20) packages: P
tot
derates linearly with 10.0 mW/K above 100 °C.
For SOT764-1 (DHVQFN20) packages: P
tot
derates linearly with 12.9 mW/K above 111 °C.
8. Recommended operating conditions
Table 5. Recommended operating conditions
Symbol Parameter
74HC244
V
CC
V
I
V
O
Δt/ΔV
supply voltage
input voltage
output voltage
input transition rise and fall rate
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
T
amb
V
CC
V
I
V
O
Δt/ΔV
T
amb
ambient temperature
supply voltage
input voltage
output voltage
input transition rise and fall rate
ambient temperature
V
CC
= 4.5 V
74HCT244
4.5
0
0
-
-40
5.0
-
-
1.67
-
5.5
V
CC
V
CC
139
+125
V
V
V
ns/V
°C
2.0
0
0
-
-
-
-40
5.0
-
-
-
1.67
-
-
6.0
V
CC
V
CC
625
139
83
+125
V
V
V
ns/V
ns/V
ns/V
°C
Conditions
Min
Typ
Max
Unit
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 27 September 2019
4 / 16
Nexperia
74HC244; 74HCT244
Octal buffer/line driver; 3-state
9. Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
74HC244
V
IH
V
CC
= 2.0 V
HIGH-level
input voltage V = 4.5 V
CC
V
CC
= 6.0 V
V
IL
V
CC
= 2.0 V
LOW-level
input voltage V = 4.5 V
CC
V
CC
= 6.0 V
V
OH
HIGH-level
output
voltage
V
I
= V
IH
or V
IL
I
O
= -20 μA; V
CC
= 2.0 V
I
O
= -20 μA; V
CC
= 4.5 V
I
O
= -20 μA; V
CC
= 6.0 V
I
O
= -6.0 mA; V
CC
= 4.5 V
I
O
= -7.8 mA; V
CC
= 6.0 V
V
OL
LOW-level
output
voltage
V
I
= V
IH
or V
IL
I
O
= 20 μA; V
CC
= 2.0 V
I
O
= 20 μA; V
CC
= 4.5 V
I
O
= 20 μA; V
CC
= 6.0 V
I
O
= 6.0 mA; V
CC
= 4.5 V
I
O
= 7.8 mA; V
CC
= 6.0 V
I
I
I
OZ
input leakage V
I
= V
CC
or GND; V
CC
= 6.0 V
current
OFF-state
output
current
supply
current
input
capacitance
V
I
= V
IH
or V
IL
; V
CC
= 6.0 V;
V
O
= V
CC
or GND
V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 6.0 V
-
-
-
-
-
-
-
0
0
0
0.15
0.16
-
-
0.1
0.1
0.1
0.26
0.26
±0.1
±0.5
-
-
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
±1.0
±5.0
-
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
±1.0
±10
V
V
V
V
V
μA
μA
1.9
4.4
5.9
3.98
5.48
2.0
4.5
6.0
4.32
5.81
-
-
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
1.5
3.15
4.2
-
-
-
1.2
2.4
3.2
0.8
2.1
2.8
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
V
V
V
V
V
V
Conditions
Min
25 °C
Typ
Max
-40 °C to +85 °C -40 °C to +125 °C Unit
Min
Max
Min
Max
I
CC
C
I
-
-
-
3.5
8.0
-
-
-
80
-
-
-
160
-
μA
pF
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 27 September 2019
5 / 16
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