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NLV74HC251ADR2G

P1-P3P4-P6P7-P9
© Semiconductor Components Industries, LLC, 2010
January, 2010 − Rev. 0
1 Publication Order Number:
MC74HC251A/D
MC74HC251A
8-Input Data Selector/
Multiplexer with
3-State Outputs
High−Performance Silicon−Gate CMOS
The MC54/74HC251 is identical in pinout to the LS251. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL outputs.
This device selects one of the eight binary Data Inputs, as
determined by the Address Inputs. The Output Enable pin must be a
low level for the selected data to appear at the outputs. If Output
Enable is high, both the Y and the Y
outputs are in the
high−impedance state. This 3−state feature allows the HC251 to be
used in bus−oriented systems.
The HC251 is similar in function to the HC251 which does not have
3−state outputs.
Features
• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 V
• Low Input Current: 1 mA
• High Noise Immunity Characteristic of CMOS Devices
• These are Pb−Free Devices
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MARKING
DIAGRAMS
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
1
16
1
16
HC251AG
AWLYWW
HC
251A
ALYWG
G
1
16
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or G = Pb−Free Package
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
ORDERING INFORMATION
(Note: Microdot may be in either location)
PIN ASSIGNMENT
1
16
13
14
15
16
9
10
11
125
4
3
2
1
8
7
6
D7
D6
D5
D4
V
CC
A2
A1
A0
D0
D1
D2
D3
GND
OUTPUT
ENABLE
Y
Y
MC74HC251A
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2
Figure 1. Logic Diagram
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
OUTPUT ENABLE
Y
Y
DATA
OUTPUTS
DATA
INPUTS
ADDRESS
INPUTS
5
6
4
3
2
1
15
14
13
12
11
10
9
7
PIN 16 = V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs Outputs
A2 A1 A0
Output
Enabled
Y Y
X
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
H
L
L
L
L
L
L
L
L
Z
D0
D1
D2
D3
D4
D5
D6
D7
Z
D0
D1
D2
D3
D4
D5
D6
D7
Z = high impedance
D0, D1, …, D7 = the level of the respective
D input.
MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) −0.5 to + 7.0 V
V
in
DC Input Voltage (Referenced to GND) −1.5 to V
CC
+ 1.5 V
V
out
DC Output Voltage (Referenced to GND) −0.5 to V
CC
+ 0.5 V
I
in
DC Input Current, per Pin ±25 mA
I
out
DC Output Current, per Pin ±50 mA
I
CC
DC Supply Current, V
CC
and GND Pins ±75 mA
P
D
Power Dissipation in Still Air SOIC Package
TSSOP Package
500
TBD
mW
T
stg
Storage Temperature −65 to + 150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress
ratings only. Functional operation above the Recommended Operating Conditions is not implied.
Extended exposure to stresses above the Recommended Operating Conditions may affect device
reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
CC
DC Supply Voltage (Referenced to GND) 2.0 6.0 V
V
in
, V
out
DC Input Voltage, Output Voltage (Referenced to GND) 0 V
CC
V
T
A
Operating Temperature, All Package Types −55 +125 °C
t
r
, t
f
Input Rise and Fall Time V
CC
= 2.0 V
(Figure 2) V
CC
= 4.5 V
V
CC
= 6.0 V
0
0
0
1000
500
400
ns
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance cir-
cuit. For proper operation, V
in
and
V
out
should be constrained to the
range GND v (V
in
or V
out
) v V
CC
.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or V
CC
).
Unused outputs must be left open.
MC74HC251A
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3
DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
Symbol Parameter Test Conditions
V
CC
V
Guaranteed Limit
Unit
− 55 to
25°C
v 85°C v 125°C
V
IH
Minimum High−Level Input
Voltage
V
out
= 0.1 V or V
CC
− 0.1 V
|I
out
| v 20 mA
2.0
4.5
6.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
V
V
IL
Maximum Low−Level Input
Voltage
V
out
= 0.1 V or V
CC
− 0.1 V
|I
out
| v 20 mA
2.0
4.5
6.0
0.3
0.9
1.2
0.3
0.9
1.2
0.3
0.9
1.2
V
V
OH
Minimum High−Level Output
Voltage
V
in
= V
IH
or V
IL
|I
out
| v 20 mA
2.0
4.5
6.0
1.9
4.4
5.9
1.9
4.4
5.9
1.9
4.4
5.9
V
V
in
= V
IH
or V
IL
|I
out
| v 4.0 mA
|I
out
| v 5.2 mA
4.5
6.0
3.98
5.48
3.84
5.34
3.70
5.20
V
OL
Maximum Low−Level Output
Voltage
V
in
= V
IH
or V
IL
|I
out
| v 20 mA
2.0
4.5
6.0
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
V
V
in
= V
IH
or V
IL
|I
out
| v 4.0 mA
|I
out
| v 5.2 mA
4.5
6.0
0.26
0.26
0.33
0.33
0.40
0.40
I
in
Maximum Input Leakage Current V
in
= V
CC
or GND 6.0 ± 0.1 ± 1.0 ± 1.0
mA
I
OZ
Maximum Three−State
Leakage Current
Output in High−Impedance State
V
in
= V
IL
or V
IH
V
out
= V
CC
or GND
6.0 ± 0.5 ± 5.0 ± 10
mA
I
CC
Maximum Quiescent Supply
Current (per Package)
V
in
= V
CC
or GND
I
out
= 0 mA
6.0 8 80 160
mA
P1-P3P4-P6P7-P9

NLV74HC251ADR2G

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Manufacturer:
ON Semiconductor
Description:
Encoders, Decoders, Multiplexers & Demultiplexers IC MULTIPLEXER 3ST 8
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