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54ACT251 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer 54ACT251
Beschreibung 8-Input Multiplexer
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 10 Seiten
54ACT251 Datasheet, Funktion
www.DataSheet4U.com
August 1998
54AC251 54ACT251
8-Input Multiplexer with TRI-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 vari-
ables. Both true and complementary outputs are provided.
Features
n ICC reduced by 50%
n Multifunctional capability
n On-chip select logic decoding
n Inverting and noninverting TRI-STATE outputs
n Outputs source/sink 24 mA
n ’ACT251 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC251: 5962-87692
— ’ACT251: 5962-89599
Logic Symbols
IEEE/IEC
DS100284-1
Pin Names
S0– S2
OE
I0– I7
Z
Z
Description
Select Inputs
TRI-STATE Output Enable Input
Multiplexer Inputs
TRI-STATE Multiplexer Output
Complementary TRI-STATE Multiplexer
Output
DS100284-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100284
www.national.com






54ACT251 Datasheet, Funktion
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
Sn to Z or Z
tPHL Propagation Delay
Sn to Z or Z
tPLH Propagation Delay
In to Z or Z
tPHL Propagation Delay
In to Z or Z
tPZH Output Enable Time
OE to Z or Z
tPZL Output Enable Time
OE to Z or Z
tPHZ Output Disable Time
OE to Z or Z
tPLZ Output Disable Time
OE to Z or Z
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
Sn to Z or Z
tPHL Propagation Delay
Sn to Z or Z
tPLH Propagation Delay
In to Z or Z
tPHL Propagation Delay
In to Z or Z
tPZH Output Enable Time
OE to Z or Z
tPZL Output Enable Time
OE to Z or Z
tPHZ Output Disable Time
OE to Z or Z
tPLZ Output Disable Time
OE to Z or Z
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 8)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
VCC
(V)
(Note 9)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
1.0 21.0
1.0 15.5
1.0 21.0
1.0 15.5
1.0 17.0
1.0 12.0
1.0 16.5
1.0 12.0
1.0 13.0
1.0 10.0
1.0 13.0
1.0 10.0
3.5 14.0
2.5 11.0
4.0 13.0
3.0 10.0
Units
ns
ns
ns
ns
ns
ns
ns
ns
54ACT
TA = −55˚C
to +125˚C
CL = 50 pF
Min Max
1.0 18.0
1.0 18.0
1.0 13.5
1.0 13.5
1.0 10.0
1.0 9.5
1.0 12.5
1.0 8.5
Units
ns
ns
ns
ns
ns
ns
ns
ns
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