Fairchild Semiconductor DM74ALS240AWMX, DM74ALS240AWM, DM74ALS240ASJX, DM74ALS240ASJ, DM74ALS240AN Datasheet
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September 1986
Revised February 2000
DM74ALS240A • DM74ALS241A
Octal 3-STATE Bus Driver
General Description
These octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS240A control inputs symmetrically enable the respective outputs when set logic LOW, while the DM74ALS241A has complementary enable gating. The 3-STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or rampdown. This eliminates bus glitching problems that arise during power-up and power-down.
Features
■Advanced low power oxide-isolated ion-implanted Schottky TTL process
■Functional and pin compatible with the DM74LS counterpart
■Improved switching performance with less power dissipation compared with the DM74LS counterpart
■Switching response specified into 500Ω and 50 pF load
■Switching response specifications guaranteed over full temperature and VCC supply range
■PNP input design reduces input loading
■Low level drive current: 74ALS = 24 mA
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74ALS240AWM |
M20B |
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide |
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DM74ALS240ASJ |
M20D |
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide |
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DM74ALS240AN |
N20A |
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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DM74ALS241AWM |
M20B |
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide |
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DM74ALS241AN |
N20A |
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
DM74ALS240A DM74ALS241A
Driver Bus STATE-3 Octal DM74ALS241A • DM74ALS240A
© 2000 Fairchild Semiconductor Corporation |
DS006210 |
www.fairchildsemi.com |
DM74ALS240A • DM74ALS241A
Function Tables
DM74ALS240A
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Input |
Output |
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G |
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A |
Y |
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L |
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L |
H |
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L |
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H |
L |
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H |
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X |
Z |
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Logic Diagrams
DM74ALS240A
DM74ALS241A
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Input |
Output |
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Input |
Output |
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1G |
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1A |
Y |
2G |
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2A |
Y |
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L |
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L |
L |
H |
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L |
L |
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L |
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H |
H |
H |
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H |
H |
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H |
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X |
Z |
L |
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X |
Z |
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DM74ALS241A
www.fairchildsemi.com |
2 |
Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC |
7V |
Input Voltage |
7V |
Voltage Applied to Disabled Output |
5.5V |
Operating Free Air Temperature Range |
0°C to +70°C |
Storage Temperature Range |
−65°C to +150°C |
Typical θJA |
|
N Package |
60.5°C/W |
M Package |
79.8°C/W |
Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol |
Parameter |
Min |
Typ |
Max |
Units |
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VCC |
Supply Voltage |
4.5 |
5 |
5.5 |
V |
VIH |
HIGH Level Input Voltage |
2 |
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V |
VIL |
LOW Level Input Voltage |
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0.8 |
V |
IOH |
HIGH Level Output Current |
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−15 |
mA |
IOL |
LOW Level Output Current |
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24 |
mA |
TA |
Operating Free Air Temperature |
0 |
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70 |
°C |
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise specified)
Symbol |
Parameter |
Conditions |
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Min |
Typ |
Max |
Units |
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VIK |
Input Clamp Voltage |
VCC = 4.5V, II = −18 mA |
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−1.5 |
V |
VOH |
HIGH Level |
VCC = 4.5V to 5.5V |
IOH = −0.4 mA |
VCC − 2 |
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V |
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Output Voltage |
VCC = 4.5V |
IOH = −3 mA |
2.4 |
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V |
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IOH = Max |
2 |
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V |
VOL |
LOW Level |
VCC = 4.5V |
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0.35 |
0.5 |
V |
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Output Voltage |
IOL = Max |
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II |
Input Current at Max |
VCC = 5.5V, VI = 7V |
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0.1 |
mA |
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Input Voltage |
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IIH |
HIGH Level Input Current |
VCC = 5.5V, VI = 2.7V |
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20 |
μA |
IIL |
LOW Level Input Current |
VCC = 5.5V, VIL = 0.4V |
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−0.1 |
mA |
IO |
Output Drive Current |
VCC = 5.5V, VO = 2.25V |
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−30 |
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−112 |
mA |
IOZH |
HIGH Level 3-STATE |
VCC = 5.5V, VO = 2.7V |
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20 |
μA |
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Output Current |
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IOZL |
LOW Level 3-STATE |
VCC = 5.5V, VO = 0.4V |
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−20 |
μA |
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Output Current |
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ICC |
Supply Current |
VCC = 5.5V, ALS240A |
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4 |
10 |
mA |
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Outputs HIGH |
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Outputs LOW |
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13 |
23 |
mA |
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Outputs 3-STATE |
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14 |
25 |
mA |
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VCC = 5.5V, ALS241A |
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9 |
15 |
mA |
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Outputs HIGH |
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Outputs LOW |
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15 |
26 |
mA |
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Outputs 3-STATE |
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17 |
30 |
mA |
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DM74ALS241A • DM74ALS240A
3 |
www.fairchildsemi.com |
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