5-1
FACT DATA
  
 ! 
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.
These devices are similar in function to the MC74AC240/74ACT240 and
MC74AC244/74ACT244 while providing flow-through 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.
•3-State 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
OE1OE2D′540 ′541
L L H L H
H X X Z Z
X H X Z Z
L L L H L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance




OCTAL
BUFFER/LINE DRIVER
WITH 3-STATE
OUTPUTS
N SUFFIX
CASE 738-03
PLASTIC
DW SUFFIX
CASE 751D-04
PLASTIC
1
OE1
2
3
4
5
6
7
8
9
10
GND
20
19
18
17
16
15
14
13
12
11
VCC
OE2
MC74AC540/74ACT540
1
OE1
2
3
4
5
6
7
8
9
10
GND
20
19
18
17
16
15
14
13
12
11
VCC
OE2
MC74AC541/74ACT541
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-2
FACT DATA
MAXIMUM RATINGS*
Symbol Parameter Value Unit
VCC DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V
Vin DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V
Vout DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V
Iin DC Input Current, per Pin ±20 mA
Iout DC Output Sink/Source Current, per Pin ±50 mA
ICC DC VCC or GND Current per Output Pin ±50 mA
Tstg 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.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Typ Max Unit
VCC
Supply Voltage
′AC 2.0 5.0 6.0
V
VCC
Supply Voltage
′ACT 4.5 5.0 5.5
V
Vin, Vout DC Input Voltage, Output Voltage (Ref. to GND) 0 VCC V
tr, tf
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
VCC @ 3.0 V 150
tr, tf
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
VCC @ 4.5 V 40 ns/V
r, tf
′AC Devices except Schmitt Inputs
VCC @ 5.5 V 25
tr, tf
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
VCC @ 4.5 V 10
ns/V
tr, tf
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
VCC @ 5.5 V 8.0
ns/V
TJJunction Temperature (PDIP) 140 °C
TAOperating Ambient Temperature Range –40 25 85 °C
IOH Output Current — High –24 mA
IOL Output Current — Low 24 mA
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. Vin from 0.8 V to 2.0 V ; see individual Data Sheets for devices that dif fer from the typical input rise and fall times.
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-3
FACT DATA
DC CHARACTERISTICS
Symbol
Parameter
VCC
(V)
74AC 74AC
Unit
Conditions
Symbol
Parameter
VCC
(V)
TA = +25°CTA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
VIH
Minimum High Level
Input Voltage
3.0 1.5 2.1 2.1 VOUT = 0.1 V
Input Voltage
4.5 2.25 3.15 3.15 V or VCC – 0.1 V
5.5 2.75 3.85 3.85
VIL
Maximum Low Level
Input Voltage
3.0 1.5 0.9 0.9 VOUT = 0.1 V
Input Voltage
4.5 2.25 1.35 1.35 V or VCC – 0.1 V
5.5 2.75 1.65 1.65
VOH
Minimum High Level
Output Voltage
3.0 2.99 2.9 2.9 IOUT = –50 µA
Output Voltage
4.5 4.49 4.4 4.4 V
5.5 5.49 5.4 5.4
V
*VIN = VIL or VIH
3.0 2.56 2.46
V
–12 mA
4.5 3.86 3.76
V
IOH –24 mA
5.5 4.86 4.76 –24 mA
VOL
Maximum Low Level
Output Voltage
3.0 0.002 0.1 0.1 IOUT = 50 µA
Output Voltage
4.5 0.001 0.1 0.1 V
5.5 0.001 0.1 0.1
V
*VIN = VIL or VIH
3.0 0.36 0.44
V
12 mA
4.5 0.36 0.44
V
IOL 24 mA
5.5 0.36 0.44 24 mA
IIN
Maximum Input
Leakage Current
5.5
±0.1
µA
VI = VCC, GND
Leakage Current
5.5
±0.1
µA
VI = VCC, GND
IOZ
Maximum
3-State
Current
VI (OE) = VIL, VIH
3-State
Current
5.5 ±0.5 ±5.0 µA VI = VCC, GND
Current
VO = VCC, GND
IOLD
†Minimum Dynamic
Output Current
5.5 75 mA VOLD = 1.65 V Max
IOHD
Output Current
5.5 –75 mA VOHD = 3.85 V Min
ICC
Maximum Quiescent
Supply Current
5.5
8.0
µA
VIN = VCC or GND
Supply Current
5.5
8.0
µA
VIN = VCC 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: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-4
FACT DATA
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
Symbol
Parameter
VCC*
(V)
74AC 74AC
Unit
Fig.
No.
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Typ Max Min Max
tPLH
Propagation Delay 3.3 1.5 5.5 7.5 1.0 8.0
ns
3-5
tPLH
Data to Output (′AC540) 5.0 1.5 4.0 6.0 1.0 6.5
ns
3-5
tPHL
Propagation Delay 3.3 1.5 5.0 7.0 1.0 7.5
ns
3-5
tPHL
Data to Output (′AC540) 5.0 1.5 4.0 5.5 1.0 6.0
ns
3-5
tPZH
Output Enable Time 3.3 3.0 8.5 11 2.5 12
ns
3-7
tPZH
(′AC540) 5.0 2.0 6.5 8.5 2.0 9.5
ns
3-7
tPZL
Output Enable Time 3.3 2.5 7.5 10 2.0 11
ns
3-8
tPZL
(′AC540) 5.0 2.0 6.0 7.5 1.5 8.5
ns
3-8
tPHZ
Output Disable Time 3.3 2.5 8.5 13 1.5 14
ns
3-7
tPHZ
(′AC540) 5.0 1.5 7.5 10.5 1.0 11
ns
3-7
tPLZ
Output Disable Time
(′AC540)
3.3 2.0 7.0 10 2.0 11
ns
3-8
tPLZ
(′AC540)
5.0 1.5 6.0 8.0 1.5 9.0
ns
3-8
tPLH
Propagation Delay
Data to Output (′AC541)
3.3 2.0 5.5 8.0 1.5 9.0
ns
3-5
tPLH
Data to Output (′AC541)
5.0 1.5 4.0 6.0 1.0 6.5
ns
3-5
tPHL
Propagation Delay
Data to Output (′AC541)
3.3 2.0 5.5 8.0 1.5 8.5
ns
3-5
tPHL
Data to Output (′AC541)
5.0 1.5 4.0 6.0 1.0 6.5
ns
3-5
tPZH
Output Enable Time
(′AC541)
3.3 3.0 8.0 11.5 3.0 12.5
ns
3-7
tPZH
(′AC541)
5.0 2.0 6.0 8.5 1.5 9.5
ns
3-7
tPZL
Output Enable Time
(′AC541)
3.3 2.5 7.0 10 2.5 11.5
ns
3-8
tPZL
(′AC541)
5.0 1.5 5.5 7.5 1.0 8.5
ns
3-8
tPHZ
Output Disable Time
(′AC541)
3.3 3.5 9.0 12.5 2.5 14
ns
3-7
tPHZ
(′AC541)
5.0 2.0 7.0 9.5 1.0 10.5
ns
3-7
tPLZ
Output Disable Time
(′AC541)
3.3 2.5 6.5 9.5 2.0 10.5
ns
3-8
tPLZ
(′AC541)
5.0 2.0 5.5 7.5 1.0 8.5
ns
3-8
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-5
FACT DATA
DC CHARACTERISTICS
Symbol
Parameter
VCC
(V)
74ACT 74ACT
Unit
Conditions
Symbol
Parameter
VCC
(V)
TA = +25°CTA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
VIH
Minimum High Level
Input Voltage
4.5 1.5 2.0 2.0
V
VOUT = 0.1 V
Input Voltage
5.5 1.5 2.0 2.0
V
or VCC – 0.1 V
VIL
Maximum Low Level
Input Voltage
4.5 1.5 0.8 0.8
V
VOUT = 0.1 V
Input Voltage
5.5 1.5 0.8 0.8
V
or VCC – 0.1 V
VOH
Minimum High Level
Output Voltage
4.5 4.49 4.4 4.4
V
IOUT = –50 µA
Output Voltage
5.5 5.49 5.4 5.4
V
*VIN = VIL or VIH
4.5 3.86 3.76 V
IOH
–24 mA
5.5 4.86 4.76
IOH
–24 mA
VOL
Maximum Low Level
Output Voltage
4.5 0.001 0.1 0.1
V
IOUT = 50 µA
Output Voltage
5.5 0.001 0.1 0.1
V
*VIN = VIL or VIH
4.5 0.36 0.44 V
IOL
24 mA
5.5 0.36 0.44
IOL
24 mA
IIN
Maximum Input
Leakage Current
5.5
±0.1
µA
VI = VCC, GND
Leakage Current
5.5
±0.1
µA
VI = VCC, GND
∆ICCT Additional Max. ICC/Input 5.5 0.6 1.5 mA VI = VCC – 2.1 V
IOZ
Maximum
3-State
Current
VI (OE) = VIL, VIH
3-State
Current
5.5 ±0.5 ±5.0 µA VI = VCC, GND
Current
VO = VCC, GND
IOLD
†Minimum Dynamic
Output Current
5.5 75 mA VOLD = 1.65 V Max
IOHD
Output Current
5.5 –75 mA VOHD = 3.85 V Min
ICC
Maximum Quiescent
Supply Current
5.5
8.0
µA
VIN = VCC or GND
Supply Current
5.5
8.0
µA
VIN = VCC 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.
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-6
FACT DATA
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
Symbol
Parameter
VCC*
(V)
74ACT 74ACT
Unit
Fig.
No.
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Typ Max Min Max
tPLH
Propagation Delay
Data to Output (′ACT540)
5.0
1.0
7.0
1.0
7.5
ns
3-5
tPLH
Data to Output (′ACT540)
5.0
1.0
7.0
1.0
7.5
ns
3-5
tPHL
Propagation Delay
Data to Output (′ACT540)
5.0
1.0
8.0
1.0
8.5
ns
3-5
tPHL
Data to Output (′ACT540)
5.0
1.0
8.0
1.0
8.5
ns
3-5
tPZH
Output Enable Time
(′ACT540)
5.0
1.0
10.5
1.0
11.5
ns
3-7
tPZH
(′ACT540)
5.0
1.0
10.5
1.0
11.5
ns
3-7
tPZL
Output Enable Time
(′ACT540)
5.0
1.0
9.5
1.0
10.5
ns
3-8
tPZL
(′ACT540)
5.0
1.0
9.5
1.0
10.5
ns
3-8
tPHZ
Output Disable Time
(′ACT540)
5.0
1.0
12.0
1.0
12.5
ns
3-7
tPHZ
(′ACT540)
5.0
1.0
12.0
1.0
12.5
ns
3-7
tPLZ
Output Disable Time
(′ACT540)
5.0
1.5
9.0
1.0
10
ns
3-8
tPLZ
(′ACT540)
5.0
1.5
9.0
1.0
10
ns
3-8
tPLH
Propagation Delay
Data to Output (′ACT541)
5.0
1.5
7.5
1.0
8.0
ns
3-5
tPLH
Data to Output (′ACT541)
5.0
1.5
7.5
1.0
8.0
ns
3-5
tPHL
Propagation Delay
Data to Output (′ACT541)
5.0
1.5
7.5
1.0
8.0
ns
3-5
tPHL
Data to Output (′ACT541)
5.0
1.5
7.5
1.0
8.0
ns
3-5
tPZH
Output Enable Time
(′ACT541)
5.0
2.0
10.0
1.0
11.0
ns
3-7
tPZH
(′ACT541)
5.0
2.0
10.0
1.0
11.0
ns
3-7
tPZL
Output Enable Time
(′ACT541)
5.0
1.5
9.5
1.0
10.5
ns
3-8
tPZL
(′ACT541)
5.0
1.5
9.5
1.0
10.5
ns
3-8
tPHZ
Output Disable Time
(′ACT541)
5.0
2.0
11.0
1.0
12.0
ns
3-7
tPHZ
(′ACT541)
5.0
2.0
11.0
1.0
12.0
ns
3-7
tPLZ
Output Disable Time
(′ACT541)
5.0
2.0
9.0
1.0
10
ns
3-8
tPLZ
(′ACT541)
5.0
2.0
9.0
1.0
10
ns
3-8
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
CAPACITANCE
Symbol Parameter Value
Typ Unit Test Conditions
CIN Input Capacitance 4.5 pF VCC = 5.0 V
CPD Power Dissipation Capacitance 30 pF VCC = 5.0 V
MC74AC540 MC74ACT540 MC74AC541 MC74ACT541
5-7
FACT DATA
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC DIP PACKAGE
CASE 738–03
ISSUE E
DW SUFFIX
PLASTIC SOIC PACKAGE
CASE 751D–04
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.150
(0.006) PER SIDE.
5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
–A–
–B–
20
1
11
10
S
A
M
0.010 (0.25) B S
T
D20X
M
B
M
0.010 (0.25)
P10X
J
F
G
18X K
C
–T–
SEATING
PLANE
M
RX 45
_
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A12.65 12.95 0.499 0.510
B7.40 7.60 0.292 0.299
C2.35 2.65 0.093 0.104
D0.35 0.49 0.014 0.019
F0.50 0.90 0.020 0.035
G1.27 BSC 0.050 BSC
J0.25 0.32 0.010 0.012
K0.10 0.25 0.004 0.009
M0 7 0 7
P10.05 10.55 0.395 0.415
R0.25 0.75 0.010 0.029
_ _ _ _
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
M
L
J20 PL
M
B
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A25.66 27.171.010 1.070
B6.10 6.600.240 0.260
C3.81 4.570.150 0.180
D0.39 0.550.015 0.022
G2.54 BSC0.100 BSC
J0.21 0.380.008 0.015
K2.80 3.550.110 0.140
L7.62 BSC0.300 BSC
M0 15 0 15
N0.51 1.010.020 0.040
_ __ _
E1.27 1.770.050 0.070
1
11
10
20
–A–
SEATING
PLANE
K
N
FG
D20 PL
–T–
M
A
M
0.25 (0.010) T
E
B
C
F1.27 BSC0.050 BSC
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MC74AC540/D
*MC74AC540/D*
◊