MOTOROLA SN74LS240DW, SN74LS240ML2, SN74LS240MR1, SN74LS240MR2, SN74LS240N Datasheet
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Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1 Publication Order Number:
SN74LS240/D
SN74LS240 SN74LS244
Octal Buf fer/Line Driver
with 3-State Outputs
The SN74LS240 and SN74LS244 are Octal Buffers and Line
Drivers designed to be employed as memory address drivers, clock
drivers and bus-oriented transmitters/receivers which provide
improved PC board density.
• Hysteresis at Inputs to Improve Noise Margins
• 3-State Outputs Drive Bus Lines or Buffer Memory Address
Registers
• Input Clamp Diodes Limit High-Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 4.75 5.0 5.25 V
T
A
Operating Ambient
T emperature Range
0 25 70 °C
I
OH
Output Current – High
–3.0 mA
–15 mA
I
OL
Output Current – Low 24 mA
LOW
POWER
SCHOTTKY
Device Package Shipping
ORDERING INFORMATION
SN74LS240N 16 Pin DIP 1440 Units/Box
SN74LS240DW 16 Pin
SOIC
DW SUFFIX
CASE 751D
http://onsemi.com
2500/Tape & Reel
PLASTIC
N SUFFIX
CASE 738
20
1
20
1
SN74LS244N 16 Pin DIP 1440 Units/Box
SN74LS244DW 16 Pin
2500/Tape & Reel
SN74LS240 SN74LS244
http://onsemi.com
2
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
18 17 16 15 14 13
123456
7
20 19
8
V
CC
1G
2G 1Y1 2A4 1Y2 1Y32A3 2A2
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4
910
2Y1 GND
12 11
1Y4 2A1
18 17 16 15 14 13
123456
7
20 19
8
V
CC
1G
2G 1Y1 2A4 1Y2 1Y32A3 2A2
1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4
910
2Y1 GND
12 11
1Y4 2A1
SN74LS240
SN74LS244
TRUTH TABLES
SN74LS240
INPUTS
1G, 2G D
OUTPUT
L
L
H
L
H
X
H
L
(Z)
SN74LS244
INPUTS
1G, 2G D
OUTPUT
L
L
H
L
H
X
L
H
(Z)
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
SN74LS240 SN74LS244
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3
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
V
IH
Input HIGH Voltage 2.0 V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VT+–V
T–
Hysteresis 0.2 0.4 V VCC = MIN
V
IK
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
p
2.4 3.4 V VCC = MIN, IOH = –3.0 mA
VOHOutput HIGH Voltage
2.0 V VCC = MIN, IOH = MAX
p
0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VOLOutput LOW Voltage
0.35 0.5 V IOL = 24 mA
V
IN
=
V
IL
or
V
IH
per Truth Table
I
OZH
Output Off Current HIGH 20 µA VCC = MAX, V
OUT
= 2.7 V
I
OZL
Output Off Current LOW –20 µA VCC = MAX, V
OUT
= 0.4 V
p
20 µA VCC = MAX, VIN = 2.7 V
IIHInput HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current –0.2 mA VCC = MAX, VIN = 0.4 V
I
OS
Output Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
Power Supply Current
Total, Output HIGH
27
Total, Output LOW LS240 44
I
CC
LS244 46
mA VCC = MAX
Total at HIGH Z LS240 50
LS244 54
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T
A
= 25°C, VCC = 5.0 V)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
t
PLH
t
PHL
Propagation Delay , Data to Output
LS240
9.0
12
14
18
ns
t
PLH
t
PHL
Propagation Delay , Data to Output
LS244
12
12
18
18
ns
CL = 45 pF,
R
L
= 667 Ω
t
PZH
Output Enable Time to HIGH Level 15 23 ns
t
PZL
Output Enable Time to LOW Level 20 30 ns
t
PLZ
Output Disable Time from LOW Level 15 25 ns
CL = 5.0 pF,
t
PHZ
Output Disable Time from HIGH Level 10 18 ns
L
RL = 667 Ω
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