©
Semiconductor Components Industries, LLC, 2002
July, 2002 Rev. 6
1
Publication Order Number:
MC74AC540/D
MC74AC540, MC74ACT540,
MC74AC541, MC74ACT541
Octal Buffer/Line Driver
with 3-State Outputs
The MC74AC540/74ACT540 and MC74AC541/74ACT541 are
octal buffer/line drivers designed to be employed as memory and
address drivers, clock drivers and bus oriented transmitter/receivers.
The MC74AC541/74ACT541 is a noninverting option of the
MC74AC540/74ACT540.
T h e s e d e v i c e s a r e s i m i l a r i n f u n c t i o n t o t h e
MC74AC240/74ACT240 and MC74AC244/74ACT244 while
providing flowthrough architecture (inputs on opposite side from
outputs). This pinout arrangement makes these devices especially
useful as output ports for microprocessors, allowing ease of layout and
greater PC board density.
·
3State Outputs
·
Inputs and Outputs Opposite Side of Package, Allowing Easier
Interface to Microprocessors
·
Outputs Source/Sink 24 mA
·
MC74AC540/74ACT540 Provides Inverted Outputs
·
MC74AC541/74ACT541 Provides Noninverted Outputs
·
ACT540 and
ACT541 Have TTL Compatible Inputs
TRUTH TABLE
Inputs
Outputs
OE
1
OE
2
D
540
541
L
H
X
L
L
X
H
L
H
X
X
L
L
Z
Z
H
H
Z
Z
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
1
20
PDIP20
N SUFFIX
CASE 738
1
20
1
20
1
20
SO20
DW SUFFIX
CASE 751
TSSOP20
DT SUFFIX
CASE 948E
EIAJ20
M SUFFIX
CASE 967
See general marking information in the device marking
section on page 9 of this data sheet.
DEVICE MARKING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
ORDERING INFORMATION
http://onsemi.com
MC74AC540, MC74ACT540, MC74AC541, MC74ACT541
http://onsemi.com
2
Figure 1. MC74AC540/74ACT540
1
OE
1
2
3
4
5
6
7
8
9
10
GND
20
19
18
17
16
15
14
13
12
11
V
CC
OE
2
1
OE
1
2
3
4
5
6
7
8
9
10
GND
20
19
18
17
16
15
14
13
12
11
V
CC
OE
2
Figure 2. MC74AC541/74ACT541
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage (Referenced to GND)
0.5 to +7.0
V
V
IN
DC Input Voltage (Referenced to GND)
0.5 to V
CC
+0.5
V
V
OUT
DC Output Voltage (Referenced to GND)
0.5 to V
CC
+0.5
V
I
IN
DC Input Current, per Pin
±
20
mA
I
OUT
DC Output Sink/Source Current, per Pin
±
50
mA
I
CC
DC V
CC
or GND Current per Output Pin
±
50
mA
T
stg
Storage Temperature
65 to +150
°
C
*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the
Recommended Operating Conditions.
MC74AC540, MC74ACT540, MC74AC541, MC74ACT541
http://onsemi.com
3
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Typ
Max
Unit
V
Supply Voltage
AC
2.0
5.0
6.0
V
V
CC
Supply Voltage
ACT
4.5
5.0
5.5
V
V
IN
, V
OUT
DC Input Voltage, Output Voltage (Ref. to GND)
0
V
CC
V
V
CC
@ 3.0 V
150
t
r
, t
f
Input Rise and Fall Time (Note 1.)
AC Devices except Schmitt Inputs
V
CC
@ 4.5 V
40
ns/V
r
,
f
AC Devices except Schmitt Inputs
V
CC
@ 5.5 V
25
t t
Input Rise and Fall Time (Note 2.)
V
CC
@ 4.5 V
10
ns/V
t
r
, t
f
In ut Rise and Fall Time (Note 2.)
ACT Devices except Schmitt Inputs
V
CC
@ 5.5 V
8.0
ns/V
T
J
Junction Temperature (PDIP)
140
°
C
T
A
Operating Ambient Temperature Range
40
25
85
°
C
I
OH
Output Current High
24
mA
I
OL
Output Current Low
24
mA
1. V
IN
from 30% to 70% V
CC
; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. V
IN
from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
MC74AC540, MC74ACT540, MC74AC541, MC74ACT541
http://onsemi.com
4
DC CHARACTERISTICS
74AC
74AC
V
CC
T
A
= +25
°
C
T
A
=
40
°
C to
+85
°
C
Symbol
Parameter
V
CC
(V)
Typ
Guaranteed Limits
Unit
Conditions
V
IH
Minimum High Level
3.0
1.5
2.1
2.1
V
OUT
= 0.1 V
IH
u
g
e e
Input Voltage
4.5
2.25
3.15
3.15
V
or V
CC
0.1 V
g
5.5
2.75
3.85
3.85
o
CC
0
V
IL
Maximum Low Level
3.0
1.5
0.9
0.9
V
OUT
= 0.1 V
IL
a
u
o
e e
Input Voltage
4.5
2.25
1.35
1.35
V
or V
CC
0.1 V
5.5
2.75
1.65
1.65
o
CC
0
V
OH
Minimum High Level
3.0
2.99
2.9
2.9
I
OUT
= 50
m
A
OH
u
g
e e
Output Voltage
4.5
4.49
4.4
4.4
V
OUT
50
m
g
5.5
5.49
5.4
5.4
*V
IN
= V
IL
or V
IH
3.0
2.56
2.46
V
12 mA
4.5
3.86
3.76
V
I
OH
24 mA
5.5
4.86
4.76
24 mA
V
OL
Maximum Low Level
3.0
0.002
0.1
0.1
I
OUT
= 50
m
A
OL
a
u
o
e e
Output Voltage
4.5
0.001
0.1
0.1
V
g
5.5
0.001
0.1
0.1
*V
IN
= V
IL
or V
IH
3.0
0.36
0.44
V
12 mA
4.5
0.36
0.44
V
I
OL
24 mA
5.5
0.36
0.44
24 mA
I
IN
Maximum Input
5 5
±
0 1
±
1 0
m
A
V
I
= V
CC
GND
I
IN
Maximum In ut
Leakage Current
5.5
±
0.1
±
1.0
m
A
V
I
= V
CC
, GND
I
OZ
Maximum
V
I
(OE) = V
IL
, V
IH
OZ
a
u
3-State
C
5.5
±
0.5
±
5.0
m
A
V
I
= V
CC
, GND
Current
5 5
0 5
5 0
m
V
O
= V
CC
, GND
I
OLD
Minimum Dynamic
O t
t C
t
5.5
75
mA
V
OLD
= 1.65 V Max
I
OHD
Output Current
5.5
75
mA
V
OHD
= 3.85 V Min
I
CC
Maximum Quiescent
5 5
8 0
80
m
A
V
IN
= V
CC
or GND
I
CC
Maximum Quiescent
Supply Current
5.5
8.0
80
m
A
V
IN
= V
CC
or GND
*All outputs loaded; thresholds on input associated with output under test.
Maximum test duration 2.0 ms, one output loaded at a time.
NOTE:
I
IN
and I
CC
@ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V V
CC
.
MC74AC540, MC74ACT540, MC74AC541, MC74ACT541
http://onsemi.com
5
AC CHARACTERISTICS
(For Figures and Waveforms See Section 3 of the ON Semiconductor FACT Data Book, DL138/D)
74AC
74AC
V
CC
*
T
A
= +25
°
C
C
L
= 50 pF
T
A
= 40
°
C
to +85
°
C
C
L
= 50 pF
Fig
Symbol
Parameter
V
CC
*
(V)
Min
Typ
Max
Min
Max
Unit
Fig.
No.
t
PLH
Propagation Delay
3.3
1.5
5.5
7.5
1.0
8.0
ns
35
t
PLH
Data to Output (
AC540)
5.0
1.5
4.0
6.0
1.0
6.5
ns
35
t
PHL
Propagation Delay
3.3
1.5
5.0
7.0
1.0
7.5
ns
35
t
PHL
Data to Output (
AC540)
5.0
1.5
4.0
5.5
1.0
6.0
ns
35
t
PZH
Output Enable Time
3.3
3.0
8.5
11
2.5
12
ns
37
t
PZH
(
AC540)
5.0
2.0
6.5
8.5
2.0
9.5
ns
37
t
PZL
Output Enable Time
3.3
2.5
7.5
10
2.0
11
ns
38
t
PZL
(
AC540)
5.0
2.0
6.0
7.5
1.5
8.5
ns
38
t
PHZ
Output Disable Time
3.3
2.5
8.5
13
1.5
14
ns
37
t
PHZ
(
AC540)
5.0
1.5
7.5
10.5
1.0
11
ns
37
t
PLZ
Output Disable Time
3.3
2.0
7.0
10
2.0
11
ns
38
t
PLZ
Ou u
sab e
e
(
AC540)
5.0
1.5
6.0
8.0
1.5
9.0
ns
38
t
PLH
Propagation Delay
3.3
2.0
5.5
8.0
1.5
9.0
ns
35
t
PLH
o aga o
e ay
Data to Output (
AC541)
5.0
1.5
4.0
6.0
1.0
6.5
ns
35
t
PHL
Propagation Delay
3.3
2.0
5.5
8.0
1.5
8.5
ns
35
t
PHL
o aga o
e ay
Data to Output (
AC541)
5.0
1.5
4.0
6.0
1.0
6.5
ns
35
t
PZH
Output Enable Time
3.3
3.0
8.0
11.5
3.0
12.5
ns
37
t
PZH
Ou u
ab e
e
(
AC541)
5.0
2.0
6.0
8.5
1.5
9.5
ns
37
t
PZL
Output Enable Time
3.3
2.5
7.0
10
2.5
11.5
ns
38
t
PZL
Ou u
ab e
e
(
AC541)
5.0
1.5
5.5
7.5
1.0
8.5
ns
38
t
PHZ
Output Disable Time
3.3
3.5
9.0
12.5
2.5
14
ns
37
t
PHZ
Ou u
sab e
e
(
AC541)
5.0
2.0
7.0
9.5
1.0
10.5
ns
37
t
PLZ
Output Disable Time
3.3
2.5
6.5
9.5
2.0
10.5
ns
38
t
PLZ
Ou u
sab e
e
(
AC541)
5.0
2.0
5.5
7.5
1.0
8.5
ns
38
*Voltage Range 3.3 V is 3.3 V
±
0.3 V.
Voltage Range 5.0 V is 5.0 V
±
0.5 V.
PDF 
ZIP