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DM74ALS251N

Part # DM74ALS251N
Description IC DATA SELECTOR/MUX 1-8 16DIP
Category IC
Availability In Stock
Qty 6
Qty Price
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National Semiconductor Corp
Date Code: 8718
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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 DS006214 www.fairchildsemi.com
April 1984
Revised April 2000
DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer
DM74ALS251
3-STATE 1-of-8 Line Data Selector/Multiplexer
General Description
This Data Selector/Multiplexer contains full on-chip decod-
ing to select one-of-eight data sources as a result of a
unique three-bit binary code at the Select inputs. Two com-
plementary outputs provide both inverting and non-invert-
ing buffer operation. An Output Control input is provided
which, when at the high level, places both outputs in the
high impedance OFF-State. In order to prevent bus access
conflicts, output disable times are shorter than output
enable times. The Select input buffers incorporate internal
overlap features to ensure that select input changes do not
cause invalid output transients.
Features
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Switching performance is guaranteed over full tempera-
ture and V
CC
supply range
Pin and functional compatible with LS family counterpart
Improved output transient handling capability
Output control circuitry incorporates power-up 3-STATE
feature
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
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
D0 thru D7 = The Level of the Respective D Input
Order Number Package Number Package Description
DM74ALS251M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS251SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS251N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Outputs
Select Strobe
CBA S
YW
XXX H Z Z
LLL L D
0
D
0
LLH L D
1
D
1
LHL L D
2
D
2
LHH L D
3
D
3
HLL L D
4
D
4
HLH L D
5
D
5
HHL L D
6
D
6
HHH L D
7
D
7
www.fairchildsemi.com 2
DM74ALS251
Logic Diagram
3 www.fairchildsemi.com
DM74ALS251
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. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
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 78.0°C/W
M Package 107.0°C/W
Symbol Parameter Min Nom 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 2.6 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
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
IN
= 18 mA 1.5 V
V
OH
HIGH Level V
CC
= 4.5V, I
OH
= Max 2.4 3.2 V
Output Voltage I
OH
= 400 µA, V
CC
= 4.5V to 5.5V V
CC
2V
V
OL
LOW Level
V
CC
= 4.5V I
OL
= 24 mA 0.35 0.5 V
Output Voltage
I
I
Input Current at Maximum
V
CC
= 5.5V, V
IH
= 7V 0.1 mA
Input Voltage
I
IH
HIGH Level Input Current V
CC
= 5.5V, V
IH
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= 5.5V, V
IN
= 0.4V 0.1 mA
I
O
Output Drive Current V
CC
= 5.5V, V
OUT
= 2.25V 30 112 mA
I
OZH
OFF-State Output
V
CC
= 5.5V, V
OUT
= 2.7V 20 µA
Current, HIGH Bias
I
OZL
OFF-State Output
V
CC
= 5.5V, V
OUT
= 0.4V 20 µA
Current, LOW Bias
I
CC
Supply Current V
CC
= 5.5V, Inputs = GND Enabled 7 10
mA
Inputs = 4.5V, V
CC
= 5.5V Disabled 9.4 14
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