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DM74ALS244AN

Part # DM74ALS244AN
Description IC BUFF/DVR TRI-ST DUAL 20DIP
Category IC
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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 DS006212 www.fairchildsemi.com
September 1986
Revised February 2000
DM74ALS244A Octal 3-STATE Bus Driver
DM74ALS244A
Octal 3-STATE Bus Driver
General Description
This octal 3-STATE bus driver is designed to provide the
designer with flexibility in implementing a bus interface with
memory, microprocessor, or communication systems. This
device offers 64-extended temperature Grade product
guaranteeing performance from 40°C to +85°C. The out-
put 3-STATE gating control is organized into two separate
groups of four buffers, and both control inputs enable the
respective outputs when set logic LOW. The 3-STATE cir-
cuitry contains a feature that maintains the buffer outputs in
3-STATE (high impedance state) during power supply
ramp-up or ramp-down. This eliminates bus glitching prob-
lems that arise during power-up and power-down.
Features
Advanced low power oxide-isolated ion-implanted
Schottky TTL process
Functional and pin compatible with the 74LS counterpart
Improved switching performance with less power dissi-
pation compared with the 74LS counterpart
Switching response specified into 500 and 50 pF load
Switching response specifications guaranteed over full
temperature and V
CC
supply range
PNP input design reduces input loading
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H = HIGH Level Logic State
L = LOW Level Logic State
X = Don't Care (Either LOW or HIGH Level Logic State)
Z = High Impedance (OFF) State
Logic Diagram
Order Number Package Number Package Description
DM74ALS244AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS244ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AMSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Input Output
G
AY
LL L
LH H
HX Z
www.fairchildsemi.com 2
DM74ALS244A
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 (unless otherwise specified)
Switching Characteristics
over recommended operating free-air temperature range
Supply Voltage, V
CC
7V
Input Voltage 7V
Voltage Applied to Disabled Output 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range 65°C to +150°C
Typical θ
JA
N Package 60.5°C/W
M Package 79.8°C/W
Symbol Parameter Min Typ Max Units
V
CC
Supply Voltage 4.5 5 5.5 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
Operating Free-Air Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
I
= 18 mA 1.5 V
V
OH
HIGH Level V
CC
= 4.5V to 5.5V I
OH
= 0.4 mA V
CC
2V
Output Voltage V
CC
= 4.5V I
OH
= 3 mA 2.4 V
I
OH
= Max 2 V
V
OL
LOW Level V
CC
= 4.5V
0.35 0.5 V
Output Voltage I
OL
= 24 mA
I
I
Input Current at Maximum Input Voltage V
CC
= 5.5V, V
I
= 7V 0.1 mA
I
IH
HIGH Level Input Current V
CC
= 5.5V, V
I
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= 5.5V, V
IL
= 0.4V 0.1 mA
I
O
Output Drive Current V
CC
= 5.5V, V
O
= 2.25V 30 112 mA
I
OZH
HIGH Level 3-STATE Output Current V
CC
= 5.5V, V
O
= 2.7V 20 µA
I
OZL
LOW Level 3-STATE Output Current V
CC
= 5.5V, V
O
= 0.4V 20 µA
I
CC
Supply Current V
CC
= 5.5V
915mA
Outputs HIGH
Outputs LOW 15 24 mA
Outputs 3-STATE 17 27 mA
Symbol Parameter Conditions
From
(Input)
To
(Output)
Min Max Units
t
PLH
Propagation Delay Time V
CC
= 4.5V to 5.5V,
A Y 3 10 ns
LOW-to-HIGH Level Output C
L
= 50 pF,
t
PHL
Propagation Delay Time R1 = 500,
A Y 3 10 ns
HIGH-to-LOW Level Output R2 = 500,
t
PZH
Output Enable Time to HIGH Level Output T
A
= Min to Max G Y 3 20 ns
t
PZL
Output Enable Time to LOW Level Output G Y 3 20 ns
t
PHZ
Output Disable Time from HIGH Level Output G Y 2 10 ns
t
PLZ
Output Disable Time from LOW Level Output G Y 1 13 ns
3 www.fairchildsemi.com
DM74ALS244A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
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