74HC244; 74HCT244
Octal buffer/line driver; 3-state
Rev. 03 — 22 December 2005
Product data sheet
1. General description
The 74HC244; 74HCT244 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC244; 74HCT244 has octal non-inverting buffer/line drivers with 3-state outputs.
The 3-state outputs are controlled by the output enable inputs 1OE and 2OE. A HIGH on
nOE causes the outputs to assume a high-impedance OFF-state. The 74HC244;
74HCT244 is identical to the 74HC240; 74HCT240 but has non-inverting outputs.
2. Features
s
s
s
s
Octal bus interface
Non-inverting 3-state outputs
Complies with JEDEC standard no. 7A
ESD protection:
x
HBM EIA/JESD22-A114-C exceeds 2000 V
x
MM EIA/JESD22-A115-A exceeds 200 V
s
Multiple package options
s
Specified from
−40 °C
to +85
°C
and from
−40 °C
to +125
°C
3. Quick reference data
Table 1:
Quick reference data
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Symbol Parameter
74HC244
t
PHL
,
t
PLH
C
i
C
PD
propagation delay
nAn to nYn
input capacitance
power dissipation
capacitance
propagation delay
nAn to nYn
input capacitance
power dissipation
capacitance
per buffer; V
I
= GND to
(V
CC
−
1.5 V)
[1]
Conditions
V
CC
= 5 V; C
L
= 15 pF
Min
-
-
Typ
9
3.5
35
Max
-
-
-
Unit
ns
pF
pF
per buffer; V
I
= GND to
V
CC
V
CC
= 5 V; C
L
= 15 pF
[1]
-
74HCT244
t
PHL
,
t
PLH
C
i
C
PD
[1]
-
-
-
11
3.5
35
-
-
-
ns
pF
pF
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
∑(C
L
×
V
CC2
×
f
o
) where:
Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
∑(C
L
×
V
CC2
×
f
o
) = sum of outputs.
4. Ordering information
Table 2:
Ordering information
Package
Temperature range Name
74HC244
74HC244N
74HC244D
74HC244DB
74HC244PW
74HC244BQ
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
DIP20
SO20
SSOP20
TSSOP20
plastic dual in-line package; 20 leads (300 mil)
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
SOT146-1
SOT163-1
SOT339-1
SOT360-1
SOT764-1
Description
Version
Type number
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
DIP20
SO20
SSOP20
TSSOP20
plastic dual in-line package; 20 leads (300 mil)
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
74HCT244
74HCT244N
74HCT244D
−40 °C
to +125
°C
−40 °C
to +125
°C
SOT146-1
SOT163-1
SOT339-1
SOT360-1
SOT764-1
74HCT244DB
−40 °C
to +125
°C
74HCT244PW
−40 °C
to +125
°C
74HCT244BQ
−40 °C
to +125
°C
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
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
2 of 22
Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
5. 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
1A0
2
18
1Y0
2A0
17
3
2Y0
2
4
1A1
4
16
1Y1
2A1
15
5
2Y1
6
8
1A2
6
14
1Y2
2A2
13
7
2Y2
19
EN
9
7
5
3
mna873
1A3
1OE
8
1
12
1Y3
2A3
2OE
11
19
9
2Y3
11
13
mna874
15
17
Fig 2. Logic symbol
Fig 3. IEC logic symbol
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
3 of 22
Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
6. Pinning information
6.1 Pinning
74HC244
74HCT244
1OE
2
3
4
5
6
7
8
9
GND 10
2A3 11
GND
(1)
1
terminal 1
index area
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
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND 10
001aae012
Transparent top view
(1) The die substrate is attached to this
pad using conductive die attach
material. It can not be used as supply
pin or input
Fig 4. Pin configuration DIP20, SO20,
SSOP20 and TSSOP20
Fig 5. Pin configuration DHVQFN20
6.2 Pin description
Table 3:
Symbol
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND
2A3
1Y3
2A2
1Y2
74HC_HCT244_3
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
1 output enable input (active LOW)
1 data input 0
2 bus output 0
1 data input 1
2 bus output 1
1 data input 2
2 bus output 2
1 data input 3
2 bus output 3
ground (0 V)
2 data input 3
1 bus output 3
2 data input 2
1 bus output 2
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
4 of 22
Philips Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
Pin description
…continued
Pin
15
16
17
18
19
20
Description
2 data input 1
1 bus output 1
2 data input 0
1 bus output 0
2 output enable input (active LOW)
supply voltage
Table 3:
Symbol
2A1
1Y1
2A0
1Y0
2OE
V
CC
7. Functional description
7.1 Function table
Table 4:
Control
nOE
L
H
[1]
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
Function table
[1]
Input
nAn
L
H
X
Output
nYn
L
H
Z
8. Limiting values
Table 5:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
quiescent supply current
ground current
storage temperature
total power dissipation
DIP20 package
SO20 package
SSOP20 package
TSSOP20 package
DHVQFN20 package
[1]
[2]
[3]
[3]
[4]
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
V
O
=
−0.5
V to (V
CC
+ 0.5 V)
Min
−0.5
-
-
-
-
-
−65
-
-
-
-
-
Max
+7
±20
±20
±35
70
−70
+150
750
500
500
500
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
mW
mW
mW
mW
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
5 of 22
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