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74HC_HCT257 Datenblatt(PDF) 1 Page - NXP Semiconductors

Teilenummer 74HC_HCT257
Bauteilbeschribung  Quad 2-input multiplexer; 3-state
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
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74HC_HCT257 Datenblatt(HTML) 1 Page - NXP Semiconductors

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1.
General description
The 74HC257; 74HCT257 are high-speed Si-gate CMOS devices and are pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC257 and 74HCT257 have four identical 2-input multiplexers with 3-state outputs,
which select 4 bits of data from two sources and are controlled by a common data select
input (S).
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data
inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the
outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74HC257 and 74HCT257 are the logic implementation of a 4-pole, 2-position switch,
where the position of the switch is determined by the logic levels applied to S. The outputs
are forced to a high-impedance OFF-state when OE is HIGH.
The logic equations for the outputs are:
Except for their non-inverting (true) outputs the 74HC257; 74HCT257 are identical to the
74HC258.
2.
Features and benefits
Non-inverting data path
3-state outputs interface directly with system bus
Complies with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from
40 Cto+85 C and from 40 Cto+125 C
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Rev. 6 — 26 January 2015
Product data sheet
1Y
OE
1I1
S
1I0
S

=
2Y
OE
2I1
S
2I0
S

=
3Y
OE
3I1
S
3I0
S

=
4Y
OE
4I1
S
4I0
S

=


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