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DM74LS244WM

Part # DM74LS244WM
Description IC BUFF/DVR/RCVR 3ST DUAL 20SOIC
Category IC
Availability In Stock
Qty 6
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1 + $0.40520
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National Semiconductor Corp
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS008442 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver
DM74LS244
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 memory-address drivers, clock driv-
ers, and bus-oriented transmitters/receivers. Featuring 400
mV of hysteresis at each low current PNP data line input,
they provide improved noise rejection and high fanout out-
puts and can be used to drive terminated lines down to
133.
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 available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
L = LOW Logic Level
H = HIGH Logic Level
X = Either LOW or HIGH Logic Level
Z = High Impedance
Order Number Package Number Package Description
DM74LS244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Output
G
AY
LLL
LHH
HXZ
www.fairchildsemi.com 2
DM74LS244
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
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 “Recommended Operating Conditions” table will define the conditions
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 V
CC
= 5V, T
A
= 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 Voltage 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 V
CC
= Min, I
I
= 18 mA 1.5 V
HYS Hysteresis (V
T+
V
T
)V
CC
= Min 0.2 0.4 V
Data Inputs Only
V
OH
HIGH Level Output Voltage V
CC
= Min, V
IH
= Min
2.7
V
IL
= Max, I
OH
= 1 mA
V
CC
= Min, V
IH
= Min
2.4 3.4 V
V
IL
= Max, I
OH
= 3 mA
V
CC
= Min, V
IH
= Min
2
V
IL
= 0.5V, I
OH
= Max
V
OL
LOW Level Output Voltage V
CC
= Min I
OL
= 12 mA 0.4
VV
IL
= Max I
OL
= Max 0.5
V
IH
= Min
I
OZH
Off-State Output Current, V
CC
= Max V
O
= 2.7V 20 µA
HIGH Level Voltage Applied V
IL
= Max
I
OZL
Off-State Output Current, V
IH
= Min V
O
= 0.4V 20 µA
LOW Level Voltage Applied
I
I
Input Current at Maximum V
CC
= Max V
I
= 7V 0.1 mA
Input Voltage
I
IH
HIGH Level Input Current V
CC
= Max V
I
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= Max V
I
= 0.4V 0.5 200 µA
I
OS
Short Circuit Output Current V
CC
= Max (Note 3) 40 225 mA
I
CC
Supply Current V
CC
= Max, Outputs HIGH 13 23
Outputs Open Outputs LOW 27 46 mA
Outputs Disabled 32 54
3 www.fairchildsemi.com
DM74LS244
Switching Characteristics
at V
CC
= 5V, T
A
= 25°C
Symbol Parameter Conditions Max Units
t
PLH
Propagation Delay Time C
L
= 45 pF
18 ns
LOW-to-HIGH Level Output R
L
= 667
t
PHL
Propagation Delay Time C
L
= 45 pF
18 ns
HIGH-to-LOW Level Output R
L
= 667
t
PZL
Output Enable Time to C
L
= 45 pF
30 ns
LOW Level R
L
= 667
t
PZH
Output Enable Time to C
L
= 45 pF
23 ns
HIGH Level R
L
= 667
t
PLZ
Output Disable Time C
L
= 5 pF
25 ns
from LOW Level R
L
= 667
t
PHZ
Output Disable Time C
L
= 5 pF
18 ns
from HIGH Level R
L
= 667
t
PLH
Propagation Delay Time C
L
= 150 pF
21 ns
LOW-to-HIGH Level Output R
L
= 667
t
PHL
Propagation Delay Time C
L
= 150 pF
22 ns
HIGH-to-LOW Level Output R
L
= 667
t
PZL
Output Enable Time to C
L
= 150 pF
33 ns
LOW Level R
L
= 667
t
PZH
Output Enable Time to C
L
= 150 pF
26 ns
HIGH Level R
L
= 667
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