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74ACT251MTC 반도체 회로 부품 판매점

8-Input Multiplexer with 3-STATE Output



Fairchild Semiconductor 로고
Fairchild Semiconductor
74ACT251MTC 데이터시트, 핀배열, 회로
November 1988
Revised November 1999
74AC251 74ACT251
8-Input Multiplexer with 3-STATE Output
General Description
The AC/ACT251 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. It can be used as universal
function generator to generate any logic function of four
variables. Both true and complementary outputs are pro-
vided.
Features
s ICC reduced by 50%
s Multifunctional capability
s On-chip select logic decoding
s Inverting and noninverting 3-STATE outputs
s Outputs source/sink 24 mA
s ACT251 has TTL-compatible inputs
Ordering Code:
Order Number Package Number
Package Description
74AC251SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150Narrow Body
74AC251SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC251MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC251PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300Wide
74ACT251SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150Narrow Body
74ACT251MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT251PC
N16E
16-Lead Plastic Dwuwawl.-DIanta-LShineeet4PUa.ccomkage (PDIP), JEDEC MS-001, 0.300Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
Description
S0S2
OE
Select Inputs
3-STATE Output Enable Input
I0I7
Z
Multiplexer Inputs
3-STATE Multiplexer Output
Z Complementary 3-STATE Multiplexer Output
FACTis a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation DS009945
www.fairchildsemi.com


74ACT251MTC 데이터시트, 핀배열, 회로
Functional Description
Truth Table
This device is a logical implementation of a single-pole, 8-
position switch with the switch position controlled by the
Inputs
Outputs
state of three Select inputs, S0, S1, S2. Both true and com-
plementary outputs are provided. The Output Enable input
OE S2 S1 S0 Z
Z
(OE) is active LOW. When it is activated, the logic function
HXXX Z Z
provided at the output is:
Z = OE (I0 S0 S1 S2 + I1S0 S1 S2 +
I2 S0 S1 S2 + I3 S0 S1 S2 +
I4 S0 S1 S2 + I5 S0 S1 S2 +
I6 S0 S1 S2 + I7 S0 S1 S2)
L L L L I0 I0
L L L H I1 I1
L L H L I2 I2
L L H H I3 I3
When the Output Enable is HIGH, both outputs are in the
L H L L I4 I4
high impedance (High Z) state. This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together. When the outputs of the 3-STATE devices are
L H L H I5 I5
L H H L I6 I6
tied together, all but one device must be in the high imped-
ance 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 voltages.
LH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
H
H I7
I7
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74ACT251MTC multiplexer

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74ACT251MTC

8-Input Multiplexer with 3-STATE Output - Fairchild Semiconductor