5-568
FAST AND LS TTL DATA
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
The SN54/74LS540 and SN54/74LS541 are octal buffers and line drivers
with the same functions as the LS240 and LS241, but with pinouts on the
opposite side of the package.
These device types are designed to be used as memory address drivers,
clock drivers and bus-oriented transmitters/receivers. These devices are
especially useful as output ports for the microprocessors, allowing ease of
layout and greater PC board density.
•Hysteresis at Inputs to Improve Noise Margin
•PNP Inputs Reduce Loading
•3-State Outputs Drive Bus Lines
•Inputs and Outputs Opposite Side of Package, Allowing Easier
Interface to Microprocessors
•Input Clamp Diodes Limit High-Speed Termination Effects
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
18 17 16 15 14 13
1 2 3 4 5 6 7
20 19
8
VCC
9 10
GND
12 11
SN54/74LS540
SN54/74LS541
18 17 16 15 14 13
1 2 3 4 5 6 7
20 19
8
VCC
9 10
GND
12 11
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54
74 –12
–15 mA
IOL Output Current — Low 54
74 12
24 mA
SN54/74LS540
SN54/74LS541
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20 1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
BLOCK DIAGRAM
LS540 LS541
E1
E2
D1
D2
D3
D4
D5
D6
D7
D8Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
(1)
(19)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9) (11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
E1
E2
D1
D2
D3
D4
D5
D6
D7
D8Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
(1)
(19)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9) (11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
5-569
FAST AND LS TTL DATA
SN54/74LS540 • SN54/74LS541
INPUTS OUTPUTS
E1E2D LS540 LS541
L L H L H
H X X Z Z
X H X Z Z
L L L H L
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial
Z = High Impedance
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54, 74 2.4 3.4 V VCC = MIN, IOH = –3.0 mA
VOH
Output HIGH Voltage
54, 74 2.0 V VCC = MIN, IOH = MAX, VIL = 0.5 V
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74 0.35 0.5 V IOL = 24 mA
VIN = VIL or VIH
per Truth Table
VT+–VT– Hysteresis 0.2 0.4 V VCC = MIN
IOZH Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V
IOZL Output Off Current LOW –20 µA VCC = MAX, VOUT = 0.4 V
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.2 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
ICC
Power Supply Current
Total, Output HIGH
LS540 25 mA
VCC = MAX
ICC
LS541 32 mA
VCC = MAX
I
CC
Total, Output LOW
Total Output 3-State
LS540 45 mA
V
CC = MAX
ICC
Total, Output LOW
Total Output 3-State
LS541 52 mA
VCC = MAX
Total Output 3-State
LS540 52 mA
Total Output 3-State
LS541 55 mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC WAVEFORMS
Ω
≥
Figure 1
Figure 2
Figure 3
Figure 4 Figure 5
≈
≈
SWITCH POSITIONS
5-570
FAST AND LS TTL DATA
SN54/74LS540 • SN54/74LS541
AC CHARACTERISTICS (TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
Propagation Delay,
Data to Output
LS540 9.0 15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
Propagation Delay,
Data to Output
LS541 12 15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPHL
Propagation Delay,
Data to Output
LS540 12 15
ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPHL LS541 12 18
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPZH
Output Enable Time
to HIGH Level
LS540 15 25
ns
CL = 45 pF
RL = 667 Ω
tPZH
Output Enable Time
to HIGH Level
LS541 15 32
ns
L = 667 Ω
tPZL
Output Enable Time
to LOW Level
LS540 20 38
ns
tPZL
Output Enable Time
to LOW Level
LS541 20 38
ns
tPHZ
Output Disable Time
to HIGH Level
LS540 10 18
ns
CL = 5.0 pF
tPHZ
Output Disable Time
to HIGH Level
LS541 10 18
ns
CL = 5.0 pF
tPLZ
Output Disable Time
to LOW Level
LS540 15 25
ns
CL = 5.0 pF
tPLZ
Output Disable Time
to LOW Level
LS541 15 29
ns
SYMBOL SW1 SW2
tPZH Open Closed
tPZL Closed Open
tPLZ Closed Closed
tPHZ Closed Closed
5-571
FAST AND LS TTL DATA
"!
! " !
&
" ! "
! " #
" #!
%# " #!
!
* * !" $ !"
*
°
°
)
°
)
°
)
! !
-A-
-B- P
110
1120
G
-T-
D
K
C
R X 45°
MFJ
Case 751D-03 DW Suffix
20-Pin Plastic
SO-20 (WIDE)
"
! !
Case 732-03 J Suffix
20-Pin Ceramic Dual In-Line
"!
! $" '' " #
!" " !" " %#
" "
" " ! $
#! !#!
°
°
!
!
!
!
°
°
B
C
DG
H
J
M
N
AL
20 11
1 10
K
F
Case 738-03 N Suffix
20-Pin Plastic
°
°
!
!
!
!
!
!
°
°
"!
! " !
&
" !
! ( " " $
! ( ! " #
!
* !" $ !" *
-A-
B
C
K
NE
G F D
J
L
M
-T-
1 10
1120
" "
5-572
FAST AND LS TTL DATA
SYMBOL SW1 SW2
tPZH Open Closed
tPZL Closed Open
tPLZ Closed Closed
tPHZ Closed Closed
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability , including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer .
Literature Distribution Centers:
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036.
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan.
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
◊
