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PDF 54ACT257 Data sheet ( Hoja de datos )
| Número de pieza | 54ACT257 | |
| Descripción | Quad 2-Input Multiplexer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 1998
54AC257 • 54ACT257
Quad 2-Input Multiplexer with TRI-STATE® Outputs
General Description
The ’AC/’ACT257 is a quad 2-input multiplexer with
TRI-STATE outputs. Four bits of data from two sources can
be selected using a Common Data Select input. The four
outputs present the selected data in true (noninverted) form.
The outputs may be switched to a high impedance state by
placing a logic HIGH on the common Output Enable (OE) in-
put, allowing the outputs to interface directly with
bus-oriented systems.
Features
n ICC and IOZ reduced by 50%
n Multiplexer expansion by tying outputs together
n Noninverting TRI-STATE outputs
n Outputs source/sink 24 mA
n ’ACT257 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC257: 5962-88703
— ’ACT257: 5962-89689
Logic Symbols
IEEE/IEC
DS100286-1
Pin Names
S
OE
I0a– I0d
I1a– I1d
Za– Zd
Description
Common Data Select Input
TRI-STATE Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
TRI-STATE Multiplexer Outputs
DS100286-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100286
www.national.com
1 page  
DC Characteristics for ’ACT Family Devices (Continued)
Symbol
ICC
Parameter
Maximum Quiescent
Supply Current
54ACT
VCC
TA =
(V) −55˚C to +125˚C
Guaranteed
Limits
5.5 80.0
Note 6: All outputs loaded; thresholds on input associated with output under test.
Note 7: Maximum test duration 2.0 ms, one output loaded at a time.
Note 8: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.
Units
µA
Conditions
VIN = VCC
or GND
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
In to Zn
tPHL Propagation Delay
In to Zn
tPLH Propagation Delay
S to Zn
tPHL Propagation Delay
S to Zn
tPZH Output Enable Time
tPZL Output Enable Time
tPHZ Output Disable Time
tPLZ Output Disable Time
Note 9: Voltage Range 3.3 is 3.0V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 9)
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
54AC
TA = −55˚C
to +125˚C
CL = 50 pF
1.0 11.0
1.0 8.0
1.0 11.0
1.0 8.5
1.0 14.5
1.0 11.0
1.0 14.5
1.0 11.0
1.0 13.0
1.0 10.0
1.0 11.0
1.0 9.5
1.0 13.0
1.0 11.0
1.0 10.5
1.0 9.5
Units
ns
ns
ns
ns
ns
ns
ns
ns
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
In to Zn
tPHL Propagation Delay
In to Zn
tPLH Propagation Delay
S to Zn
tPHL Propagation Delay
S to Zn
tPZH Output Enable Time
VCC
(V)
(Note 10)
5.0
5.0
5.0
5.0
5.0
54ACT
TA = −55˚C
to +125˚C
CL = 50 pF
1.0 8.0
1.0 9.5
1.0 11.0
1.0 11.5
1.0 9.5
Units
ns
ns
ns
ns
ns
5 www.national.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 54ACT257.PDF ] | |
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