74HC_T244.pdf
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Octal buffer/line driver; 3-state
INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
·
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
·
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
·
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT244
Octal buffer/line driver; 3-state
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74HC/HCT244
FEATURES
The 74HC/HCT244 are octal non-inverting buffer/line
drivers with 3-state outputs. The 3-state
ou
tputs
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 “244” is identical to the “240”
but has non-inverting outputs.
·
Output capability: bus driver
·
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT244 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
QUICK REFERENCE DATA
GND = 0 V; T
amb
=25
C; t
r
=t
f
= 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay
1A
n
to 1Y
n
;
2A
n
to 2Y
n
C
L
= 15 pF; V
CC
=5V
9
11
ns
C
I
input capacitance
3.5
3.5
pF
C
PD
power dissipation capacitance per buffer notes 1 and 2
35
35
pF
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
m
W):
P
D
=C
PD
´
V
CC
2
´
f
i
+å
(C
L
´
V
CC
2
´
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
å
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
-
(C
L
´
V
CC
2
´
1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
December 1990
2
°
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74HC/HCT244
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
1OE
output enable input (active LOW)
2, 4, 6, 8
1A
0
to 1A
3
data inputs
3, 5, 7, 9
2Y
0
to 2Y
3
bus outputs
10
GND
ground (0 V)
17, 15, 13, 11 2A
0
to 2A
3
data inputs
18, 16, 14, 12 1
Y
0
to 1Y
3
bus outputs
19
2OE
output enable input (active LOW)
20
V
CC
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74HC/HCT244
FUNCTION TABLE
INPUTS
OUTPUT
nOE
nA
n
nY
n
L
L
H
L
H
X
L
H
Z
Note
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
Fig.4 Functional diagram.
December 1990
4
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74HC/HCT244
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
=50pF
T
amb
(
°
C)
TEST CONDITIONS
74HC
SYMBOL
PARAMETER
UNIT
WAVEFORMS
V
CC
(V)
+
25
-
40 to
+
85
-
40 to
+
125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
1A
n
to 1Y
n;
2A
n
to 2Y
n
30
11
9
110
22
19
145
28
24
165
33
28
ns
2.0
4.5
6.0
Fig.5
t
PZH
/ t
PZL
3-
stat
e output enable time
1
OE
to 1Y
n;
2OE to 2Y
n
36
13
10
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.6
t
PHZ
/ t
PLZ
3-
stat
e output disable time
1
OE
to 1Y
n;
2OE to 2Y
n
39
14
11
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.6
t
THL
/ t
TLH
output transition time
14
5
4
60
12
10
75
15
13
90
18
15
ns
2.0
4.5
6.0
Fig.5
December 1990
5
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