INTEGRATED CIRCUITS
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
Philips
Semiconductors
Philips Semiconductors
Product specification
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
74LVC244A
74LVCH244A
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
t
PHL
/t
PLH
C
I
C
PD
PARAMETER
Propagation delay
1A
n
to 1Y
n;
2A
n
to 2Y
n
Input capacitance
Power dissipation capacitance per
buffer
Notes 1 and 2
CONDITIONS
C
L
= 50pF
V
CC
= 3 3V
3.3V
TYPICAL
3.5
35
4.4
22.6
UNIT
ns
pF
pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
mW):
P
D
= C
PD
x V
CC2
x f
i
+
S
(C
L
x V
CC2
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
CC2
x f
o
) = sum of outputs.
2. The condition is V
I
= GND to V
CC
ORDERING INFORMATION
PACKAGES
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
OUTSIDE
NORTH AMERICA
74LVC244A D
74LVC244A DB
74LVC244A PW
74LVCH244A D
74LVCH244A DB
74LVCH244A PW
NORTH AMERICA
74LVC244A D
74LVC244A DB
7LVC244APW DH
74LVCH244A D
74LVCH244A DB
LVCH244APW DH
PKG. DWG. #
SOT163-1
SOT339-1
SOT360-1
SOT163-1
SOT339-1
SOT360-1
1998 May 20
2
853-1876 19419
Philips Semiconductors
Product specification
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
74LVC244A
74LVCH244A
PIN DESCRIPTION
PIN NUMBER
1
2, 4, 6, 8
3, 5, 7, 9
10
17, 15, 13, 11
18, 16, 14, 12
19
20
SYMBOL
1OE
1A
0
to 1A
‘3
2Y
0
to 2Y
3
GND
2A
0
to 2A
3
1Y
0
to 1Y
3
2OE
V
CC
FUNCTION
Output enable input (active LOW)
Data inputs
Bus outputs
Ground (0V)
Bus inputs
Bus outputs
Output enable input (active-LOW)
Positive supply voltage
FUNCTION TABLE
INPUTS
nOE
L
L
H
H
L
X
Z
nA
n
L
H
X
OUTPUT
nY
n
L
H
Z
= HIGH voltage level
= LOW voltage level
= Don’t care
= High impedance OFF-state
LOGIC SYMBOL
PIN CONFIGURATION
1A
0
2
18
1Y
0
2A
0
17
3
2Y
o
5
1A
1
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
4
16
1Y
1
2A
1
15
2Y
1
V
CC
2OE
1Y0
2A0
1Y1
2A1
1Y2
2A2
1Y3
2A3
1A
2
6
14
1Y
2
12
1Y
3
2A
2
13
7
2Y
2
9
2Y
3
1A
3
8
2A
3
11
1OE
1
2OE
19
SV00210
FUNCTIONAL DIAGRAM
GND 10
SV00212
2 1A
0
1Y
0
18
4 1A
1
1Y
1
16
LOGIC SYMBOL (IEEE/IEC)
6 1A
2
1Y
2
14
1Y
3
12
8 1A
3
1
EN
1 1OE
18
16
14
15
12
13
2A
2
2Y
2
7
17
2A
0
2Y
o
3
2
4
6
8
2A
1
2Y
1
5
19
EN
11
11
13
15
17
9
7
5
3
19 2OE
2A
3
2Y
3
9
SV00211
SV00209
1998 May 20
3
Philips Semiconductors
Product specification
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
74LVC244A
74LVCH244A
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
DC supply voltage (for max speed performance)
max.
V
CC
V
I
V
O
T
amb
t
r
, t
f
DC supply voltage (for low-voltage applications)
DC Input voltage range
DC Output voltage range; output HIGH or LOW
state
DC output voltage range; output 3-State
Operating ambient temperature range in free-air
Input rise and fall times
V
CC
= 1.2 to 2.7V
V
CC
= 2.7 to 3.6V
CONDITIONS
MIN
2.7
27
1.2
0
0
0
–40
0
0
MAX
3.6
36
V
3.6
5.5
V
CC
5.5
+85
20
10
°C
ns/V
V
V
UNIT
ABSOLUTE MAXIMUM RATINGS
1
In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to GND (ground = 0V)
SYMBOL
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
GND
, I
CC
T
stg
P
TOT
PARAMETER
DC supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage; output HIGH or LOW state
DC output voltage; output 3-State
DC output source or sink current
DC V
CC
or GND current
Storage temperature range
Power dissipation per package
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
V
I
t0
Note 2
V
O
uV
CC
or V
O
t
0
Note 2
Note 2
V
O
= 0 to V
CC
CONDITIONS
RATING
–0.5 to +6.5
–50
–0.5 to +6.5
"50
–0.5 to V
CC
+0.5
–0.5 to 6.5
"50
"100
–65 to +150
500
500
UNIT
V
mA
V
mA
V
mA
mA
°C
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.
1998 May 20
4
Philips Semiconductors
Product specification
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
74LVC244A
74LVCH244A
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
MIN
V
IH
HIGH level Input voltage
V
CC
= 1.2V
V
CC
= 2.7 to 3.6V
LOW level Input voltage
V
CC
= 1.2V
V
CC
= 2.7 to 3.6V
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= –12mA
V
O
OH
HIGH level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= –100µA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= –18mA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= –24mA
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= 12mA
V
OL
LOW level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= 100µA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= 24mA
I
I
I
OZ
I
off
I
CC
∆I
CC
I
BHL
I
BHH
I
BHLO
I
BHHO
Input leakage current
3-State output OFF-state current
Power off leakage supply
Quiescent supply current
Additional quiescent supply current
per input pin
Bushold LOW sustaining
current
2, 3, 4
Bushold HIGH sustaining
current
2, 3, 4
Bushold LOW overdrive current2
, 3, 5
Bushold HIGH overdrive current2
, 3, 5
V
CC
= 3 6V; V
I
= 5 5V or GND
3.6V;
5.5V
V
CC
= 3.6V; V
I
= V
IH
or V
IL
; V
O
= 5.5V or GND
V
CC
= 0.0V; V
I
or V
O
= 5.5V
V
CC
= 3.6V; V
I
= V
CC
or GND; I
O
= 0
V
CC
= 2.7V to 3.6V; V
I
= V
CC
–0.6V; I
O
= 0
V
CC
= 3.0V; V
I
=0.8V
V
CC
= 3.0V; V
I
=2.0V
V
CC
= 3.6V
V
CC
= 3.6V
75
–75
500
–500
"0.1
"0
1
0.1
0.1
0.1
5
–
–
–
–
GND
V
CC
*0.5
V
CC
*0.2
V
CC
*0.6
V
CC
*0.8
0.40
0.20
0.55
"5
"5
"10
10
500
–
–
–
–
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
V
CC
V
V
CC
2.0
GND
V
0.8
TYP
1
MAX
V
UNIT
V
IL
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.
1998 May 20
5
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