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PDF MC74AC253 Data sheet ( Hoja de datos )

Número de pieza MC74AC253
Descripción DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
Fabricantes Motorola Semiconductors　
Logotipo Motorola Semiconductors Logotipo



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MC74AC253
MC74ACT253
Dual 4ĆInput Multiplexer
with 3ĆState Outputs
The MC74AC253/74ACT253 is a dual 4-input multiplexer with 3-state outputs. It
can select two bits of data from four sources using common select inputs. The
outputs may be individually switched to a high impedance state with a HIGH on the
respective Output Enable (OE) inputs, allowing the outputs to interface directly with
bus oriented systems.
• Multifunctional Capability
• Noninverting 3-State Outputs
• Outputs Source/Sink 24 mA
• ′ACT253 Has TTL Compatible Inputs
VCC OEb S0 I3b I2b I1b I0b Zb
16 15 14 13 12 11 10 9
12345678
OEa S1 I3a I2a I1a I0a Za GND
PIN NAMES
I0a–I3a
I0b–I3b
S0, S1
OEa
OEb
Za, Zb
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Output Enable Input
Side B Output Enable Input
3-State Outputs
DUAL 4-INPUT
MULTIPLEXER WITH
3-STATE OUTPUTS
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
TRUTH TABLE
Select
Inputs
Data Inputs
Output
Enable
S0 S1 I0 I1 I2 I3
XXXXXX
L L LXXX
L LHXXX
HLXLXX
H L XHXX
L HXX L X
LHXXHX
HHXXX L
HHXXXH
OE
H
L
L
L
L
L
L
L
L
Address inputs S0 and S1 are common to both sections.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Outputs
Z
Z
L
H
L
H
L
H
L
H
LOGIC SYMBOL
OEa I0a I1a I2a I3a I0b I1b I2b I3b OEb
S0
S1
Za Zb
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FACT DATA
5-1
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MC74AC253 pdf
MC74AC253 MC74ACT253
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
tPLH
tPHL
tPLH
tPHL
tPZH
Propagation Delay
Sn to Zn
Propagation Delay
Sn to Zn
Propagation Delay
In to Zn
Propagation Delay
In to Zn
Output Enable Time
tPZL
Output Enable Time
tPHZ
Output Disable Time
tPLZ
Output Disable Time
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
Min Typ Max
3.3 2.0
5.0 2.0
3.3 2.5
5.0 2.0
15.5
11.0
16.0
11.5
3.3 1.5
5.0 1.5
3.3 2.0
5.0 1.5
14.5
10.0
13.0
9.5
3.3 1.5
5.0 1.5
3.3 1.5
5.0 1.5
3.3 2.0
5.0 2.0
3.3 1.5
5.0 1.5
8.0
6.0
8.0
6.0
9.5
8.0
8.0
7.0
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min Max
2.0 17.5
1.5 12.5
2.0 18.0
1.5 13.0
1.5 17.0
1.5 11.5
1.5 15.0
1.5 11.0
1.0 8.5
1.0 6.5
1.0 9.0
1.0 7.0
1.5 10.0
1.5 8.5
1.0 9.0
1.0 7.5
Unit
ns
ns
ns
ns
ns
ns
ns
ns
Fig.
No.
3-6
3-6
3-5
3-5
3-7
3-8
3-7
3-8
FACT DATA
5-5

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