INTEGRATED CIRCUITS
74LV244
Octal buffer/line driver (3-State)
Product specification |
1998 May 20 |
Supersedes data of 1997 Feb 19
IC24 Data Handbook
m n r
Philips Semiconductors |
Product specification |
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Octal buffer/line driver (3-State) |
74LV244 |
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FEATURES
•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 VCC = 2.7 V and VCC = 3.6 V
•Typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V, Tamb = 25°C
•Typical VOHV (output VOH undershoot) > 2 V at VCC = 3.3 V, Tamb = 25°C
•Output capability: bus driver
•ICC 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 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. The 74LV244 is identical to the 74LV240 but has non-inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
SYMBOL |
PARAMETER |
CONDITIONS |
TYPICAL |
UNIT |
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Propagation delay |
CL = 15 pF; |
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tPHL/tPLH |
1An to 1Yn; |
VCC = 3.3 V |
8.0 |
ns |
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2An to 2Yn |
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CI |
Input capacitance |
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3.5 |
pF |
CPD |
Power dissipation capacitance per buffer |
VCC = 3.3 V |
35 |
pF |
VI = GND to VCC1 |
NOTE:
1.CPD is used to determine the dynamic power dissipation (PD in μW) PD = CPD VCC2 fi (CL VCC2 fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;(CL VCC2 fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES |
TEMPERATURE RANGE |
OUTSIDE NORTH AMERICA |
NORTH AMERICA |
PKG. DWG. # |
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20-Pin Plastic DIL |
±40°C to +125°C |
74LV244 N |
74LV244 N |
SOT146-1 |
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20-Pin Plastic SO |
±40°C to +125°C |
74LV244 D |
74LV244 D |
SOT163-1 |
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20-Pin Plastic SSOP Type II |
±40°C to +125°C |
74LV244 DB |
74LV244 DB |
SOT339-1 |
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20-Pin Plastic TSSOP Type I |
±40°C to +125°C |
74LV244 PW |
74LV244PW DH |
SOT360-1 |
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PIN CONFIGURATION
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1 |
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1OE |
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20 |
VCC |
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1A0 |
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2 |
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19 |
2OE |
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2Y0 |
3 |
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18 |
1Y0 |
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1A1 |
4 |
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17 |
2A0 |
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2Y1 |
5 |
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16 |
1Y1 |
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1A2 |
6 |
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15 |
2A1 |
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2Y2 |
7 |
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14 |
1Y2 |
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1A3 |
8 |
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13 |
2A2 |
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2Y3 |
9 |
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12 |
1Y3 |
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GND |
10 |
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11 |
2A3 |
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LOGIC SYMBOL
2 |
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1A0 |
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1Y0 |
18 |
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17 |
2A0 |
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2Y0 |
3 |
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4 |
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1A1 |
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1Y1 |
16 |
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15 |
2A1 |
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2Y1 |
5 |
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6 |
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1A2 |
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1Y2 |
14 |
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13 |
2A2 |
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2Y2 |
7 |
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8 |
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1A3 |
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1Y3 |
12 |
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11 |
2A3 |
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2Y3 |
9 |
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1 |
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1OE |
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19 |
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2OE |
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SV00621 |
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SV00620
1998 May 20 |
2 |
853±1924 19420 |
Philips Semiconductors |
Product specification |
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Octal buffer/line driver (3-State) |
74LV244 |
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PIN DESCRIPTION
PIN |
SYMBOL |
FUNCTION |
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NUMBER |
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1 |
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Output enable input (active LOW) |
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1OE |
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2, 4, 6, 8 |
1A0 to 1A3 |
Data inputs |
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3, 5, 7, 9 |
2Y0 to 2Y3 |
Bus outputs |
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10 |
GND |
Ground (0 V) |
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17, 15, 13, 11 |
2A0 to 2A3 |
Data inputs |
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18, 16, 14, 12 |
1Y0 to 1Y3 |
Bus outputs |
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19 |
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Output enable input (active LOW) |
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2OE |
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20 |
VCC |
Positive supply voltage |
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LOGIC SYMBOL (IEEE/IEC)
1
EN
2 |
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18 |
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4 |
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16 |
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6 |
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14 |
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8 |
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12 |
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19 |
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EN |
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11 |
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9 |
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13 |
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7 |
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15 |
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5 |
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17 |
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3 |
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SV00666 |
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FUNCTIONAL DIAGRAM
2 |
1A0 |
1Y0 |
18 |
4 |
1A1 |
1Y1 |
16 |
6 |
1A2 |
1Y2 |
14 |
8 |
1A3 |
1Y3 |
12 |
1 |
1OE |
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17 |
2A0 |
2Y0 |
3 |
15 |
2A1 |
2Y1 |
5 |
13 |
2A2 |
2Y2 |
7 |
11 |
2A3 |
2Y3 |
9 |
19 |
2OE |
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SV00622 |
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FUNCTION TABLE
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INPUTS |
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OUTPUT |
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nOE |
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nAn |
nYn |
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L |
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L |
L |
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L |
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H |
H |
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H |
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X |
Z |
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NOTES: |
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H |
= |
HIGH voltage level |
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L |
= |
LOW voltage level |
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X |
= |
don't care |
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Z |
= |
high impedance OFF-state |
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1998 May 20 |
3 |
Philips Semiconductors |
Product specification |
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|
Octal buffer/line driver (3-State) |
74LV244 |
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RECOMMENDED OPERATING CONDITIONS
SYMBOL |
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
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VCC |
DC supply voltage |
See Note 1 |
1.0 |
3.3 |
5.5 |
V |
VI |
Input voltage |
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0 |
± |
VCC |
V |
VO |
Output voltage |
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0 |
± |
VCC |
V |
Tamb |
Operating ambient temperature range in free air |
See DC and AC |
±40 |
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+85 |
°C |
characteristics |
±40 |
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+125 |
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VCC = 1.0V to 2.0V |
± |
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500 |
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tr, tf |
Input rise and fall times |
VCC = 2.0V to 2.7V |
± |
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200 |
ns/V |
VCC = 2.7V to 3.6V |
± |
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100 |
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VCC = 3.6V to 5.5V |
± |
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50 |
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NOTE:
1.The LV is guaranteed to function down to VCC = 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
SYMBOL |
PARAMETER |
CONDITIONS |
RATING |
UNIT |
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VCC |
DC supply voltage |
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±0.5 to +7.0 |
V |
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"IIK |
DC input diode current |
VI < ±0.5 or VI > VCC + 0.5V |
20 |
mA |
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"IOK |
DC output diode current |
VO < ±0.5 or VO > VCC + 0.5V |
50 |
mA |
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"IO |
DC output source or sink current |
±0.5V < VO < VCC + 0.5V |
35 |
mA |
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± bus driver outputs |
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"IGND, |
DC VCC or GND current for types with |
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70 |
mA |
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± bus driver outputs |
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"ICC |
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Tstg |
Storage temperature range |
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±65 to +150 |
°C |
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Power dissipation per package |
for temperature range: ±40 to +125°C |
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PTOT |
± plastic DIL |
above +70°C derate linearly with 12 mW/K |
750 |
mW |
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± plastic mini-pack (SO) |
above +70°C derate linearly with 8 mW/K |
500 |
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± plastic shrink mini-pack (SSOP and TSSOP) |
above +60°C derate linearly with 5.5 mW/K |
400 |
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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 ªrecommended operating conditionsº 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 |
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