Philips 74LV244N, 74LV244DB, 74LV244D, 74LV244U Datasheet
74LV244
Octal buffer/line driver (3-State)
Product specification
Supersedes data of 1997 Feb 19
IC24 Data Handbook
1998 May 20
INTEGRATED CIRCUITS
Philips Semiconductors Product specification
74L V244Octal buffer/line driver (3-State)
2
1998 May 20 853–1924 19420
FEA TURES
•Wide operating voltage: 1.0 to 5.5 V
•Optimized for low voltage applications: 1.0 to 3.6 V
•Accepts TTL input levels between V
CC
= 2.7 V and V
CC
= 3.6 V
•Typical V
OLP
(output ground bounce) < 0.8 V at V
CC
= 3.3 V ,
T
amb
= 25°C
•Typical V
OHV
(output VOH undershoot) > 2 V at V
CC
= 3.3 V ,
T
amb
= 25°C
•Output capability: bus driver
•I
CC
category: MSI
DESCRIPTION
The 74LV244 is a low-voltage Si-gate CMOS device and is pin and
function compatible with 74HC/HCT244.
The 74LV244 is an octal non-inverting buf fer/line driver 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 74LV244 is identical to
the 74LV240 but has non-inverting outputs.
QUICK REFERENCE DA TA
GND = 0 V; T
amb
= 25°C; tr = t
f
≤ 2.5 ns
SYMBOL
PARAMETER CONDITIONS TYPICAL UNIT
t
PHL/tPLH
Propagation delay
1An to 1Yn;
2An to 2Y
n
CL = 15 pF;
VCC = 3.3 V
8.0 ns
C
I
Input capacitance 3.5 pF
C
PD
Power dissipation capacitance per buffer
VCC = 3.3 V
VI = GND to V
CC
1
35 pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (PD in µW)
P
D
= CPD V
CC
2
fi (CL V
CC
2
fo) where:
f
i
= input frequency in MHz; CL = output load capacitance in pF;
f
o
= output frequency in MHz; VCC = supply voltage in V;
(C
L
V
CC
2
fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
20-Pin Plastic DIL –40°C to +125°C 74LV244 N 74LV244 N SOT146-1
20-Pin Plastic SO –40°C to +125°C 74LV244 D 74LV244 D SOT163-1
20-Pin Plastic SSOP Type II –40°C to +125°C 74LV244 DB 74LV244 DB SOT339-1
20-Pin Plastic TSSOP Type I –40°C to +125°C 74LV244 PW 74LV244PW DH SOT360-1
PIN CONFIGURATION
SV00620
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1OE
1A
0
2Y
0
1A
1
2Y
1
1A
2
2Y
2
1A
3
2Y
3
GND
2A
3
1Y
3
2A
2
1Y
2
2A
1
1Y
1
2A
0
1Y
0
2OE
V
CC
LOGIC SYMBOL
SV00621
1Y
0
2Y
0
18
3
1Y
1
2Y
1
16
5
1Y
2
2Y
2
14
7
1Y
3
2Y
3
12
9
1A
0
2A
0
2
17
1A
1
2A
1
4
15
1A
2
2A
2
6
13
1A
3
2A
3
8
11
1OE1
2OE19
Philips Semiconductors Product specification
74LV244Octal buffer/line driver (3-State)
1998 May 20
3
PIN DESCRIPTION
PIN
NUMBER
SYMBOL FUNCTION
1 1OE Output enable input (active LOW)
2, 4, 6, 8 1A0 to 1A3Data inputs
3, 5, 7, 9 2Y0 to 2Y3Bus outputs
10 GND Ground (0 V)
17, 15, 13, 11 2A0 to 2A3Data inputs
18, 16, 14, 12 1Y0 to 1Y3Bus outputs
19 2OE Output enable input (active LOW)
20 V
CC
Positive supply voltage
LOGIC SYMBOL (IEEE/IEC)
SV00666
18
16
14
12
2
4
6
8
EN
1
9
7
5
3
11
13
15
17
EN
19
FUNCTIONAL DIAGRAM
SV00622
2Y03
2Y
1
5
2Y
2
7
2Y
3
9
2A
0
17
2A
1
15
2A
2
13
2A
3
11
2OE19
1Y018
1Y
1
16
1Y
2
14
1Y
3
12
1A
0
2
1A
1
4
1A
2
6
1A
3
8
1OE
1
FUNCTION T ABLE
INPUTS OUTPUT
nOE nA
n
nY
n
L L L
L H H
H X Z
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
Philips Semiconductors Product specification
74LV244Octal buffer/line driver (3-State)
1998 May 20
4
RECOMMENDED OPERATING CONDITIONS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
V
CC
DC supply voltage See Note 1 1.0 3.3 5.5 V
V
I
Input voltage 0 – V
CC
V
V
O
Output voltage 0 – V
CC
V
T
amb
Operating ambient temperature range in free air
See DC and AC
characteristics
–40
–40
+85
+125
°C
tr, t
f
Input rise and fall times
VCC = 1.0V to 2.0V
VCC = 2.0V to 2.7V
VCC = 2.7V to 3.6V
VCC = 3.6V to 5.5V
–
–
–
–
–
–
–
–
500
200
100
50
ns/V
NOTE:
1. The LV is guaranteed to function down to V
CC
= 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to
V
CC
= 5.5V .
ABSOLUTE MAXIMUM RATINGS
1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
SYMBOL
PARAMETER CONDITIONS RATING UNIT
V
CC
DC supply voltage –0.5 to +7.0 V
I
IK
DC input diode current VI < –0.5 or VI > VCC + 0.5V 20 mA
I
OK
DC output diode current VO < –0.5 or VO > VCC + 0.5V 50 mA
I
O
DC output source or sink current
– bus driver outputs
–0.5V < VO < VCC + 0.5V 35 mA
I
GND
,
I
CC
DC VCC or GND current for types with
– bus driver outputs
70 mA
T
stg
Storage temperature range –65 to +150 °C
P
TOT
Power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
for temperature range: –40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
750
500
400
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability .
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
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