DM74ALS540A Octal Inverting Buffer and Line Driver with 3-STATE Outputs
October 1986
Revised February 2000
DM74ALS540A
Octal Inverting Buffer and Line Driver
with 3-STATE Outputs
General Description
This octal buffer and line driver is designed to have the per-
formance of the DM74ALS240A series and, at the same
time, offer a pinout with inputs and outputs on opposite
sides of the package. This arrangement greatly enhances
printed circuit board layout. The 3-STATE control gate is a
2-input NOR such that if either G1 or G2 is HIGH, all eight
outputs are in the high impedance state.
Features
s
Advanced oxide-isolated, ion-implanted Schottky TTL
process
s
Switching performance is guaranteed over full tempera-
ture and V
CC
supply range
s
Data flow-thru pinout (All inputs on opposite side from
outputs)
s
P-N-P inputs reduce DC loading
Ordering Code:
Order Number
DM74ALS540AWM
DM74ALS540ASJ
DM74ALS540AN
Package Number Package Description
M20B
M20D
N20A
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
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 Diagram
Function Table
Inputs
G1
H
X
L
L
G2
X
H
L
L
A
X
X
L
H
Output
Y
Hi-Z
Hi-Z
H
L
H
=
HIGH Logic Level
L
=
LOW Logic Level
X
=
Don't Care (Either HIGH or LOW Logic Level)
Hi-Z
=
High Impedance (OFF) State
© 2000 Fairchild Semiconductor Corporation
DS009170
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DM74ALS540A
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Voltage Applied to a
Disabled 3-STATE Output
Operating Free-Air Temperature Range
Storage Temperature Range
Typical
θ
JA
N Package
M Package
58.5°C/W
77.5°C/W
5.5V
0°C to
+70°C
−65°C
to
+150°C
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.
7V
7V
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Parameter
Min
4.5
2
0.7
−15
24
70
Nom
5
Max
5.5
Units
V
V
V
mA
mA
°C
Electrical Characteristics
over recommended free air temperature range
Symbol
V
IK
V
OH
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
V
OL
I
I
I
IH
I
IL
I
OZH
I
OZL
I
O
I
CC
LOW Level
Output Voltage
Input Current @ Maximum Input Voltage V
CC
=
Max, V
I
=
7V
HIGH Level Input Current
LOW Level Input Current
HIGH Level 3-STATE Output Current
LOW Level 3-STATE Output Current
Output Drive Current
Supply Current
V
CC
=
Max, V
I
=
2.7V
V
CC
=
Max, V
I
=
0.4V
V
CC
=
Max, V
O
=
2.7V
V
CC
=
Max, V
O
=
0.4V
V
CC
=
Max, V
O
=
2.25V
V
CC
=
Max
Outputs HIGH
Outputs LOW
Outputs Disabled
−30
5
13
11
Test Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
4.5V to 5.5V
V
CC
=
Min
V
CC
=
Min
I
OH
= −0.4
mA
I
OH
= −3
mA
I
OH
=
Max
I
OL
=
12 mA
I
OL
=
24 mA
V
CC
−
2
2.4
2
0.25
0.35
0.4
0.5
100
20
−100
20
−20
−112
10
22
19
mA
mA
µA
µA
µA
µA
µA
mA
3.2
V
Min
Typ
Max
−1.5
Units
V
Switching Characteristics
over recommended free air operating temperature range
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time to HIGH Level Output
Output Enable Time to LOW Level Output
Output Disable Time from HIGH Level Output
Output Disable Time from LOW Level Output
Conditions
V
CC
=
4.5V to 5.5V,
R
1
=
R
2
=
500Ω,
C
L
=
50 pF
From (Input)
To (Output)
A or B to Y
A or B to Y
G to Y
G to Y
G to Y
G to Y
Min
2
2
5
8
1
2
Max
12
9
15
20
10
12
Units
ns
ns
ns
ns
ns
ns
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2
DM74ALS540A
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
3
www.fairchildsemi.com
DM74ALS540A
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
www.fairchildsemi.com
4
DM74ALS540A Octal Inverting Buffer and Line Driver with 3-STATE Outputs
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:
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 rea-
sonably expected to result in a significant injury to the
user.
5
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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