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74LS251 PDF даташит

Спецификация 74LS251 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «LOW POWER SCHOTTKY».

Детали детали

Номер произв 74LS251
Описание LOW POWER SCHOTTKY
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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74LS251 Даташит, Описание, Даташиты
SN74LS251
8-Input Multiplexer
with 3-State Outputs
The TTL/MSI SN74LS251 is a high speed 8-Input Digital
Multiplexer. It provides, in one package, the ability to select one bit of
data from up to eight sources. The LS251 can be used as a universal
function generator to generate any logic function of four variables.
Both assertion and negation outputs are provided.
Schottky Process for High Speed
Multifunction Capability
On-Chip Select Logic Decoding
Inverting and Non-Inverting 3-State Outputs
Input Clamp Diodes Limit High Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current – High
IOL Output Current – Low
– 2.6
24
mA
mA
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS251N 16 Pin DIP 2000 Units/Box
SN74LS251D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS251/D









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74LS251 Даташит, Описание, Даташиты
SN74LS251
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC I4 I5 I6 I7 S0 S1 S2
16 15 14 13 12 11 10 9
1 2 3 4 56 78
I3 I2 I1 I0 Z Z E0 GND
PIN NAMES
S0 – S2
E0
I0 – I7
Z
Z
Select Inputs
Output Enable (Active LOW) Inputs
Multiplexer Inputs
Multiplexer Output
Complementary Multiplexer Output
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
0.5 U.L.
65 U.L.
65 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
15 U.L.
15 U.L.
9
S2
10
S1
11
S0
7
E1
LOGIC DIAGRAM
I0 I1
I2 I3 I4
I5 I6
I7
4 3 2 1 15 14 13 12
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
5
Z
6
Z
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74LS251 Даташит, Описание, Даташиты
SN74LS251
FUNCTIONAL DESCRIPTION
The LS251 is a logical implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both assertion and
negation outputs are provided. The Output Enable input
(EO) is active LOW. When it is activated, the logic function
provided at the output is:
Z = EO (I0 S0 S1 S2 + I1 S0 S1 S2 + I2 S0 S1
Z = EO S2 + I3 S0 S1S2 + I4 S0 S1 S2 + I5 S0
Z = EO S1 S2 + I6 S0 S1 S2 + I7 S0 S1 S2).
When the Output Enable is HIGH, both outputs are in the
high impedance (high Z) state. This feature allows
multiplexer expansion by tying the outputs of up to 128
devices together. When the outputs of the 3-state devices are
tied together, all but one device must be in the high
impedance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be
designed to ensure there is no overlap in the active LOW
portion of the enable voltage.
TRUTH TABLE
E0 S2 S1 S0 I0 I1 I2 I3 I4 I5 I6
H X X X X X X X XX X
L L L L L X X X XX X
L L L L H X X X XX X
L L L H X L X X XX X
L L L H X H X X XX X
L L H L X X L X XX X
L L H L X X H X XX X
L L H H X X X L XX X
L L H H X X X H XX X
L H L L X X X X LX X
L H L L X X X X HX X
L H L H X X X X XL X
L H L H X X X X XH X
L H H L X X X X XX L
L H H L X X X X XX H
L H H H X X X X XX X
L H H H X X X X XX X
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High impedance (Off)
I7 Z Z
X (Z) (Z)
XHL
X LH
XHL
X LH
XHL
X LH
XHL
X LH
XHL
X LH
XHL
X LH
XHL
X LH
L HL
H LH
http://onsemi.com
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