74AC540 Octal Buffer/Line Driver with 3-STATE Outputs
November 1988
Revised March 2005
74AC540
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The AC540 is an octal buffer/line drivers designed to be
employed as memory and address drivers, clock drivers
and bus oriented transmitter/receivers.
These devices are similar in function to the AC240 while
providing flow-through architecture (inputs on opposite side
from outputs). This pinout arrangement makes these
devices especially useful as output ports for microproces-
sors, allowing ease of layout and greater PC board density.
Features
s
I
CC
and I
OZ
reduced by 50%
s
3-STATE inverting outputs
s
Inputs and outputs opposite side of package, allowing
easier interface to microprocessors
s
Output source/sink 24 mA
Ordering Code:
Order Number
74AC540SC
74AC540SJ
74AC540MTC
74AC540PC
Package Number
M20B
M20D
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
IEEE/IEC
Connection Diagram
Truth Table
Inputs
OE
1
L
H
X
L
OE
2
L
X
H
L
I
H
X
X
L
L
Z
Z
H
Outputs
H HIGH Voltage Level
L LOW Voltage Level
X Immaterial
Z High Impedance
FACT
¥
is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
Ds009966
www.fairchildsemi.com
74AC540
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
V
I
0.5V to
7.0V
20 mA
20 mA
0.5V to V
CC
0.5V
20 mA
20 mA
0.5V to V
CC
0.5V
r
50 mA
r
50 mA
65
q
C to
150
q
C
140
q
C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
'
V/
'
t)
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
2.0V to 6.0V
0V to V
CC
0V to V
CC
0.5V
V
CC
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
V
O
40
q
C to
85
q
C
125 mV/ns
0.5V
V
CC
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
PDIP
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT
¥
circuits outside databook specifications.
DC Electrical Characteristics
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
(Note 4)
I
OZ
Maximum Input
Leakage Current
Maximum 3-STATE
Current
I
OLD
I
OHD
I
CC
(Note 4)
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
4.0
V
I
(OE)
V
IL
, V
IH
5.5
0.002
0.001
0.001
T
A
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
25
q
C
T
A
40
q
C to
85
q
C
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
Units
V
OUT
V
Conditions
0.1V
Guaranteed Limits
or V
CC
0.1V
V
OUT
V
0.1V
or V
CC
0.1V
V
I
OUT
V
IN
50
P
A
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
V
I
OH
I
OH
I
OH
I
OUT
V
IN
12 mA
24 mA
24 mA (Note 2)
50
P
A
V
IL
or V
IH
12 mA
24 mA
24 mA (Note 2)
V
CC
, GND
0.44
0.44
0.44
V
I
OL
I
OL
I
OL
V
I
r
0.1
r
1.0
P
A
r
0.25
r
2.5
75
P
A
mA
mA
V
I
V
O
V
CC
, GND
V
CC
, GND
1.65V Max
3.85V Min
V
CC
V
OLD
V
OHD
V
IN
or GND
75
40.0
P
A
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 4:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
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2
74AC540
AC Electrical Characteristics
V
CC
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
Data to Output
Propagation Delay
Data to Output
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
(V)
(Note 5)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Note 5:
Voltage Range 3.3 is 3.3V
r
0.3V
Voltage Range 5.0 is 5.0V
r
0.5V
T
A
C
L
Min
1.5
1.5
1.5
1.5
3.0
2.0
2.5
2.0
2.5
1.5
2.5
1.5
25
q
C
50 pF
Typ
5.5
4.0
5.0
4.0
8.5
6.5
7.5
6.0
8.5
7.5
7.0
6.0
Max
7.5
6.0
7.0
5.5
11.0
8.5
10.0
7.5
13.0
10.5
10.0
8.0
T
A
40
q
C to
85
q
C
C
L
50 pF
Max
8.0
6.5
7.5
6.0
12.0
9.5
11.0
8.5
14.0
11.0
11.0
9.0
ns
ns
ns
ns
ns
ns
Units
Min
1.0
1.0
1.0
1.0
2.5
2.0
2.0
1.5
1.5
1.0
2.0
1.5
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
30.0
Units
pF
pF
V
CC
V
CC
OPEN
5.0V
Conditions
3
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