Philips
Semiconductors
74LVC244A/74LVCH244A
Octal buffer/line driver with 5-volt tolerant
inputs/outputs (3-State)title
Product specification
Supersedes data of 1996 Sep 06
IC24 Data Handbook
1998 May 20
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74LVC244A
74LVCH244A
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
2
1998 May 20
853-1876 19419
FEATURES
5-volt tolerant inputs/outputs, for interfacing with 5-volt logic
Supply voltage range of 2.7V to 3.6V
Complies with JEDEC standard no. 8-1A
CMOS low power consumption
Direct interface with TTL levels
High impedance when V
CC
= 0V
Bushold on all data inputs (74LVCH244A only)
DESCRIPTION
The 74LVC244A/74LVCH244A is a high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most advanced
CMOS compatible TTL families.
Inputs can be driven from either 3.3V or 5V devices. In 3-State
operation, outputs can handle 5V. These features allow the use of
these devices as translators in a mixed 3.3V/5V environment.
The 74LVC244A/74LVCH244A is an octal non-inverting buffer/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. Schmitt-trigger
action at all inputs makes the circuit highly tolerant for slower input
rise and fall times.
The '244' is functionally identical to the '240', but the '240' has
non-inverting outputs.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
t
/t
Propagation delay
1A to 1Y
C
L
= 50pF
V
CC
= 3 3V
3 5
ns
t
PHL
/t
PLH
1A
n
to 1Y
n;
2A
n
to 2Y
n
V
CC
= 3.3V
3.5
ns
C
I
Input capacitance
4.4
pF
C
PD
Power dissipation capacitance per
buffer
Notes 1 and 2
22.6
pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
m
W):
P
D
= C
PD
x V
CC
2
x f
i
+
S
(C
L
x V
CC
2
x f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacity in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
S
(C
L
x V
CC
2
x f
o
) = sum of outputs.
2. The condition is V
I
= GND to V
CC
ORDERING INFORMATION
PACKAGES
TEMPERATURE
RANGE
OUTSIDE
NORTH AMERICA
NORTH AMERICA
PKG. DWG. #
20-Pin Plastic Shrink Small Outline (SO)
40
C to +85
C
74LVC244A D
74LVC244A D
SOT163-1
20-Pin Plastic Shrink Small Outline (SSOP) Type II
40
C to +85
C
74LVC244A DB
74LVC244A DB
SOT339-1
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
40
C to +85
C
74LVC244A PW
7LVC244APW DH
SOT360-1
20-Pin Plastic Shrink Small Outline (SO)
40
C to +85
C
74LVCH244A D
74LVCH244A D
SOT163-1
20-Pin Plastic Shrink Small Outline (SSOP) Type II
40
C to +85
C
74LVCH244A DB
74LVCH244A DB
SOT339-1
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
40
C to +85
C
74LVCH244A PW
LVCH244APW DH
SOT360-1
Philips Semiconductors
Product specification
74LVC244A
74LVCH244A
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
1998 May 20
3
PIN DESCRIPTION
PIN NUMBER
SYMBOL
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 (0V)
17, 15, 13, 11
2A
0
to 2A
3
Bus inputs
18, 16, 14, 12
1Y
0
to 1Y
3
Bus outputs
19
2OE
Output enable input (active-LOW)
20
V
CC
Positive supply voltage
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
1Y3
GND
2A2
1Y2
2A1
1Y1
2A0
1Y0
2OE
VCC
2A3
SV00212
LOGIC SYMBOL (IEEE/IEC)
1
2
18
4
16
6
14
8
12
19
11
9
13
7
15
5
17
3
EN
EN
SV00209
FUNCTION TABLE
INPUTS
OUTPUT
nOE
nA
n
nY
n
L
L
L
L
H
H
H
X
Z
H = HIGH voltage level
L
= LOW voltage level
X = Don't care
Z = High impedance OFF-state
LOGIC SYMBOL
2
4
6
8
1
18
16
14
12
1A
0
1A
1
1A
2
1A
3
1OE
1Y
0
1Y
1
1Y
2
1Y
3
17
15
13
11
19
3
5
7
9
2A
0
2A
1
2A
2
2A
3
2OE
2Y
o
2Y
1
2Y
2
2Y
3
SV00210
FUNCTIONAL DIAGRAM
2
4
6
8
1
18
16
14
12
1A
0
1A
1
1A
2
1A
3
1OE
1Y
0
1Y
1
1Y
2
1Y
3
17
15
13
11
19
3
5
7
9
2A
0
2A
1
2A
2
2A
3
2OE
2Y
o
2Y
1
2Y
2
2Y
3
SV00211
Philips Semiconductors
Product specification
74LVC244A
74LVCH244A
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
1998 May 20
4
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
UNIT
DC supply voltage (for max speed performance)
2 7
3 6
V
CC
DC supply voltage (for max. speed performance)
2.7
3.6
V
V
CC
DC supply voltage (for low-voltage applications)
1.2
3.6
V
V
I
DC Input voltage range
0
5.5
V
V
O
DC Output voltage range; output HIGH or LOW
state
0
V
CC
V
O
DC output voltage range; output 3-State
0
5.5
T
amb
Operating ambient temperature range in free-air
40
+85
C
t
r
, t
f
Input rise and fall times
V
CC
= 1.2 to 2.7V
V
CC
= 2.7 to 3.6V
0
0
20
10
ns/V
ABSOLUTE MAXIMUM RATINGS
1
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 +6.5
V
I
IK
DC input diode current
V
I
t
0
50
mA
V
I
DC input voltage
Note 2
0.5 to +6.5
V
I
OK
DC output diode current
V
O
u
V
CC
or V
O
t
0
"
50
mA
V
O
DC output voltage; output HIGH or LOW state
Note 2
0.5 to V
CC
+0.5
V
V
O
DC output voltage; output 3-State
Note 2
0.5 to 6.5
V
I
O
DC output source or sink current
V
O
= 0 to V
CC
"
50
mA
I
GND
, I
CC
DC V
CC
or GND current
"
100
mA
T
stg
Storage temperature range
65 to +150
C
Power dissipation per package
P
TOT
plastic mini-pack (SO)
above +70
C derate linearly with 8 mW/K
500
mW
plastic shrink mini-pack (SSOP and TSSOP)
above +60
C derate linearly with 5.5 mW/K
500
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.
Philips Semiconductors
Product specification
74LVC244A
74LVCH244A
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
1998 May 20
5
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions voltages are referenced to GND (ground = 0V)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
Temp = -40
C to +85
C
UNIT
MIN
TYP
1
MAX
V
HIGH level Input voltage
V
CC
= 1.2V
V
CC
V
V
IH
HIGH level Input voltage
V
CC
= 2.7 to 3.6V
2.0
V
V
LOW level Input voltage
V
CC
= 1.2V
GND
V
V
IL
LOW level Input voltage
V
CC
= 2.7 to 3.6V
0.8
V
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= 12mA
V
CC
*
0.5
V
O
HIGH level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= 100
A
V
CC
*
0.2
V
CC
V
V
OH
HIGH level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= 18mA
V
CC
*
0.6
V
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= 24mA
V
CC
*
0.8
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= 12mA
0.40
V
OL
LOW level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= 100
A
GND
0.20
V
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= 24mA
0.55
I
Input leakage current
V
= 3 6V; V = 5 5V or GND
"
0 1
"
5
A
I
I
Input leakage current
V
CC
= 3.6V; V
I
= 5.5V or GND
"
0.1
"
5
A
I
OZ
3-State output OFF-state current
V
CC
= 3.6V; V
I
= V
IH
or V
IL
; V
O
= 5.5V or GND
0.1
"
5
A
I
off
Power off leakage supply
V
CC
= 0.0V; V
I
or V
O
= 5.5V
0.1
"
10
A
I
CC
Quiescent supply current
V
CC
= 3.6V; V
I
= V
CC
or GND; I
O
= 0
0.1
10
A
I
CC
Additional quiescent supply current
per input pin
V
CC
= 2.7V to 3.6V; V
I
= V
CC
0.6V; I
O
= 0
5
500
A
I
BHL
Bushold LOW sustaining
current
2, 3, 4
V
CC
= 3.0V; V
I
=0.8V
75
A
I
BHH
Bushold HIGH sustaining
current
2, 3, 4
V
CC
= 3.0V; V
I
=2.0V
75
A
I
BHLO
Bushold LOW overdrive current2
, 3, 5
V
CC
= 3.6V
500
A
I
BHHO
Bushold HIGH overdrive current2
, 3, 5
V
CC
= 3.6V
500
A
NOTES:
1. All typical values are at V
CC
= 3.3V and T
amb
= 25
C.
2. Valid for data inputs of bushold parts (LVCH-A) only.
3. For data inputs only, control inputs do not have a bushold circuit
4. The specified sustaining current at the data inputs do not have a bushold circuit.
5. The specified overdrive current at the data input forces the data input to the opposite logic input state.
6. For bushold parts, the bushold circuit is switched off when V
I
exceeds V
CC
allowing 5.5V on the input terminal.
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