Fairchild DM74ALS240AWM Octal 3-state bus driver Datasheet

Revised February 2000
DM74ALS240A • DM74ALS241A
Octal 3-STATE Bus Driver
General Description
Features
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.
■ Advanced low power
Schottky TTL process
oxide-isolated
ion-implanted
■ 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
DM74ALS240AWM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Description
DM74ALS240ASJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS240AN
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74ALS241AWM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS241AN
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
DM74ALS240A
© 2000 Fairchild Semiconductor Corporation
DM74ALS241A
DS006210
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DM74ALS240A • DM74ALS241A Octal 3-STATE Bus Driver
September 1986
DM74ALS240A • DM74ALS241A
Function Tables
DM74ALS240A
Input
DM74ALS241A
Output
Input
Output
Input
Output
G
A
Y
1G
1A
Y
2G
2A
Y
L
L
H
L
L
L
H
L
L
L
H
L
L
H
H
H
H
H
H
X
Z
H
X
Z
L
X
Z
Logic Diagrams
DM74ALS240A
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DM74ALS241A
2
Supply Voltage, VCC
7V
Input Voltage
7V
Voltage Applied to Disabled Output
5.5V
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.
0°C to +70°C
Operating Free Air Temperature Range
−65°C to +150°C
Storage Temperature Range
Typical θJA
N Package
60.5°C/W
M Package
79.8°C/W
Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Units
4.5
5
5.5
V
VCC
Supply Voltage
VIH
HIGH Level Input Voltage
VIL
LOW Level Input Voltage
0.8
V
IOH
HIGH Level Output Current
−15
mA
IOL
LOW Level Output Current
24
mA
TA
Operating Free Air Temperature
70
°C
2
V
0
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise specified)
Symbol
Parameter
Conditions
Min
VIK
Input Clamp Voltage
VCC = 4.5V, II = −18 mA
VOH
HIGH Level
VCC = 4.5V to 5.5V
IOH = −0.4 mA
Output Voltage
VCC = 4.5V
IOH = −3 mA
IOH = Max
VOL
II
LOW Level
VCC = 4.5V
Output Voltage
IOL = Max
Input Current at Max
Input Voltage
Typ
Max
Units
−1.5
V
VCC − 2
V
2.4
V
2
V
0.35
VCC = 5.5V, VI = 7V
0.5
V
0.1
mA
IIH
HIGH Level Input Current
VCC = 5.5V, VI = 2.7V
20
µA
IIL
LOW Level Input Current
VCC = 5.5V, VIL = 0.4V
−0.1
mA
IO
Output Drive Current
VCC = 5.5V, VO = 2.25V
−112
mA
IOZH
HIGH Level 3-STATE
VCC = 5.5V, VO = 2.7V
20
µA
VCC = 5.5V, VO = 0.4V
−20
µA
4
10
mA
Outputs LOW
13
23
mA
Outputs 3-STATE
14
25
mA
9
15
mA
Outputs LOW
15
26
mA
Outputs 3-STATE
17
30
mA
Output Current
IOZL
LOW Level 3-STATE
Output Current
ICC
Supply Current
VCC = 5.5V, ALS240A
Outputs HIGH
VCC = 5.5V, ALS241A
Outputs HIGH
3
−30
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DM74ALS240A • DM74ALS241A
Absolute Maximum Ratings(Note 1)
DM74ALS240A • DM74ALS241A
Switching Characteristics DM74ALS240A
over recommended operating free air temperature range
Symbol
tPLH
tPHL
tPZH
Parameter
Conditions
Propagation Delay Time
VCC = 4.5V to 5.5V,
LOW-to-HIGH Level Output
CL = 50 pF,
Propagation Delay Time
R1 = 500Ω,
HIGH-to-LOW Level Output
R2 = 500Ω,
Output Enable Time
TA = Min to Max
to HIGH Level Output
tPZL
From
(Input)
To
(Output)
A
Y
G
Output Enable Time
Output Disable Time
from HIGH Level Output
tPLZ
G
Output Disable Time
Max
Units
2
9
ns
2
9
ns
3
13
ns
3
18
ns
2
10
ns
3
12
ns
Min
Max
Units
3
11
ns
3
10
ns
3
21
ns
3
21
ns
2
10
ns
3
15
ns
7
21
ns
7
21
ns
2
10
ns
3
15
ns
Y
to LOW Level Output
tPHZ
Min
Y
from LOW Level Output
Switching Characteristics DM74ALS241A
over recommended operating free air temperature range
Symbol
tPLH
tPHL
tPZH
Parameter
Conditions
Propagation Delay Time
VCC = 4.5V to 5.5V,
LOW-to-HIGH Level Output
CL = 50 pF,
Propagation Delay Time
R1 = 500Ω,
HIGH-to-LOW Level Output
R2 = 500Ω,
Output Enable Time
TA = Min to Max
to HIGH Level Output
tPZL
From
(Input)
To
(Output)
A
Y
1G
Output Enable Time
Y
to HIGH Level Output
tPHZ
Output Disable Time
to HIGH Level Output
tPLZ
1G
Output Disable Time
Y
to LOW Level Output
tPZH
Output Enable Time
to HIGH Level Output
tPZL
2G
Output Enable Time
Y
to LOW Level Output
tPHZ
Output Disable Time
from HIGH Level Output
tPLZ
2G
Output Disable Time
from LOW Level Output
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4
Y
DM74ALS240A • DM74ALS241A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
5
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DM74ALS240A • DM74ALS241A
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
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6
DM74ALS240A • DM74ALS241A Octal 3-STATE Bus Driver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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7
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