Fairchild Semiconductor DM74LS240WMX, DM74LS240WM, DM74LS240SJX, DM74LS240SJ, DM74LS240N Datasheet
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© 2000 Fairchild Semiconductor Corporation DS006411 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS240 • DM74LS241 Octal 3-STATE Buffer/Line Driver/Line Receiver
DM74LS240 • DM74LS241
Octal 3-STATE Buffer/Line Driver/Line Receiver
General Description
These buffers/line drivers are designed to improve both the
performance and PC board density of 3-STATE buffers/
drivers employed as memor y-address drivers, clock drivers, and bus-oriented transmitters/receivers. Featuring
400 mV of hysteresis at each low current PNP da ta line
input, they provide improved noise rejection and high
fanout outputs and can be used to dri ve terminated lines
down to 133Ω.
Features
■ 3-STATE outputs drive bus lines directly
■ PNP inputs reduce DC loading on bus lines
■ Hysteresis at data inputs improves noise margins
■ Typical I
OL
(sink current)
24 mA
■ Typical I
OH
(source current)
−15 mA
■ Typical propagation delay times
Inverting 10.5 ns
Noninverting 12 ns
■ Typical enable/disable time 18 ns
■ Typical power dissipation (enabled)
Inverting 130 mW
Noninverting 135 mW
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Connection Diagrams
DM74LS240
DM74LS241
Order Number Package Number Package Description
DM74LS240WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74LS241WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS241N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
www.fairchildsemi.com 2
DM74LS240 • DM74LS241
Function Tables
DM74LS240 DM74LS241
L = LOW Logic Level
H = HIGH Logic Level
X = Either LOW or HIGH Logic Level
Z = High Impedance
Inputs Output
G
AY
LLH
LHL
HXZ
Inputs Outputs
GG
1A 2A 1Y 2Y
XLLXL
XLHXH
XHXXZ
HXXL L
HXXH H
LXXX Z
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DM74LS240 • DM74LS241
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute M aximu m R atin gs” are t hose valu es b eyo nd w hich
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Volta ge 0.8 V
I
OH
HIGH Level Output Current −15 mA
I
OL
LOW Level Output Current 24 mA
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 2)
V
I
Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V
HYS Hysteresis (VT+ − VT−)
VCC = Min 0.2 0.4 V
Data Inputs Only
V
OH
HIGH Level Output Voltage VCC = Min, VIH = Min
2.7
VIL = Max, IOH = −1 mA
VCC = Min, VIH = Min
2.4 3.4 V
VIL = Max, IOH = −3 mA
VCC = Min, VIH = Min
2
VIL = 0.5V, IOH = Max
V
OL
LOW Level Output Voltage VCC = Min IOL = 12 mA 0.4
VIL = Max
IOL = Max 0.5
V
VIH = Min
I
OZH
Off-State Output Current, VCC = Max
VO = 2.7V 20 µA
HIGH Level Voltage Applied VIL = Max
I
OZL
Off-State Output Current, VIH = Min
VO = 0.4V −20 µA
LOW Level Voltage Applied
I
I
Input Current at Maximum VCC = Max
0.1 mA
Input Voltage VI = 7V
I
IH
HIGH Level Input Current VCC = Max, VI = 2.7V 20 µA
I
IL
LOW Level Input Current VCC = Max, VI = 0.4V −0.2 mA
I
OS
Short Circuit Output Current VCC = Max (Note 3) −40 −225 mA
I
CC
Supply Current VCC = Max, Outputs HIGH 13 23
Outputs OPEN
Outputs LOW
26 44
27 46 mA
Outputs Disabled
29 50
32 54
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