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74AHCT157BQ Datasheet(PDF) 1 Page - NXP Semiconductors

No. de pieza 74AHCT157BQ
Descripción Electrónicos  Quad 2-input multiplexer
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Fabricante Electrónico  NXP [NXP Semiconductors]
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74AHCT157BQ Datasheet(HTML) 1 Page - NXP Semiconductors

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1.
General description
The 74AHC/AHCT157 are high-speed Si-gate CMOS devices and are pin compatible with
Low Power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74AHC/AHCT157 are quad 2-input multiplexer which select 4 bits of data from two
sources under the control of a common data select input (S). The enable input (E) is
active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of
all other input conditions.
Moving the data from two groups of registers to four common output buses is a common
use of the 74AHC/AHCT157. The state of the common data select input (S) determines
the particular register from which the data comes. It can also be used as function
generator. The device is useful for implementing highly irregular logic by generating any
four of the 16 different functions of two variables with one variable common. The
74AHC/AHCT157 is logic implementation of a 4-pole, 2-position switch, where the
position of the switch is determine by the logic levels applied to S.
The logic equations are:
1Y = E
× (1I1 × S + 1I0 × S)
2Y = E
× (2I1 × S + 2I0 × S)
3Y = E
× (3I1 × S + 3I0 × S)
4Y = E
× (4I1 × S + 4I0 × S)
The 74AHC/AHCT157 is identical to the 74AHC/AHCT158 but has non-inverting (true)
outputs.
2.
Features
s Balanced propagation delays
s All inputs have a Schmitt-trigger action
s Inputs accepts voltages higher than VCC
s Multiple input enable for easy expansion
s Ideal for memory chip select decoding
s For 74AHC157 only: operates with CMOS input levels
s For 74AHCT157 only: operates with TTL input levels
s ESD protection:
x HBM JESD22-A114E exceeds 2000 V
x MM JESD22-A115-A exceeds 200 V
x CDM JESD22-C101C exceeds 1000 V
74AHC157; 74AHCT157
Quad 2-input multiplexer
Rev. 02 — 9 November 2007
Product data sheet


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