Motorola SN54LS241J, SN54LS244J, SN54LS240J, SN74LS240D, SN74LS240N Datasheet
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OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS
The SN54/74LS240, 241 and 244 are Octal Buffers and Line Drivers designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC board density.
•Hysteresis at Inputs to Improve Noise Margins
•3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
•Input Clamp Diodes Limit High-Speed Termination Effects
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
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SN54 / 74LS240 |
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VCC |
2G |
1Y1 |
2A4 |
1Y2 |
2A3 |
1Y3 |
2A2 |
1Y4 |
2A1 |
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
1G |
1A1 |
2Y4 |
1A2 |
2Y3 |
1A3 |
2Y2 |
1A4 |
2Y1 |
GND |
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SN54 / 74LS241 |
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VCC |
2G |
1Y1 |
2A4 |
1Y2 |
2A3 |
1Y3 |
2A2 |
1Y4 |
2A1 |
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
1G |
1A1 |
2Y4 |
1A2 |
2Y3 |
1A3 |
2Y2 |
1A4 |
2Y1 |
GND |
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SN54 / 74LS244 |
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VCC |
2G |
1Y1 |
2A4 |
1Y2 |
2A3 |
1Y3 |
2A2 |
1Y4 |
2A1 |
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
1G |
1A1 |
2Y4 |
1A2 |
2Y3 |
1A3 |
2Y2 |
1A4 |
2Y1 |
GND |
SN54/74LS240
SN54/74LS241
SN54/74LS244
OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
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J SUFFIX |
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CERAMIC |
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20 |
CASE 732-03 |
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1 |
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N SUFFIX |
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PLASTIC |
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20 |
CASE 738-03 |
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1 |
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DW SUFFIX |
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20 |
SOIC |
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CASE 751D-03 |
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1 |
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
FAST AND LS TTL DATA
5-387
SN54/74LS240 •SN54/74LS241 •SN54/74LS244
TRUTH TABLES
SN54 / 74LS240
INPUTS |
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OUTPUT |
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1G, 2G |
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D |
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L |
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L |
H |
L |
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H |
L |
H |
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X |
(Z) |
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SN54 / 74LS244
INPUTS |
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OUTPUT |
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1G, 2G |
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D |
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L |
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L |
L |
L |
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H |
H |
H |
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X |
(Z) |
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SN54 / 74LS241
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INPUTS |
OUTPUT |
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INPUTS |
OUTPUT |
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1G |
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D |
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2G |
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D |
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L |
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L |
L |
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H |
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L |
L |
L |
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H |
H |
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H |
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H |
H |
H |
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X |
(Z) |
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L |
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X |
(Z) |
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H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
GUARANTEED OPERATING RANGES
Symbol |
Parameter |
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Min |
Typ |
Max |
Unit |
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VCC |
Supply Voltage |
54 |
4.5 |
5.0 |
5.5 |
V |
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74 |
4.75 |
5.0 |
5.25 |
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TA |
Operating Ambient Temperature Range |
54 |
± 55 |
25 |
125 |
°C |
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74 |
0 |
25 |
70 |
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IOH |
Output Current Ð High |
54, 74 |
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± 3.0 |
mA |
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54 |
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± 12 |
mA |
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74 |
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± 15 |
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IOL |
Output Current Ð Low |
54 |
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12 |
mA |
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74 |
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24 |
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FAST AND LS TTL DATA
5-388
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