MC74ACT158 Просмотр технического описания (PDF) - Motorola => Freescale

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MC74ACT158

Quad 2-Input Multiplexer

Motorola => Freescale 

MC74AC158 MC74ACT158

FUNCTIONAL DESCRIPTION

The MC74AC158/74ACT158 quad 2-input multiplexer

selects four bits of data from two sources under the control of

a common Select input (S) and presents the data in inverted

form at the four outputs. The Enable input (E) is active-LOW.

When E is HIGH, all of the outputs (Z) are forced HIGH

regardless of all other inputs. The MC74AC158/74ACT158 is

the logic implementation of a 4-pole, 2-position switch where

the position of the switch is determined by the logic levels

supplied to the Select input.

A common use of the MC74AC158/74ACT158 is the

moving of data from two groups of registers to four common

output busses. The particular register from which the data

comes is determined by the state of the Select input. A less

obvious use is as a function generator. The MC74AC158/

74ACT158 can generate four functions of two variables with

one variable common. This is useful for implementing gating

functions.

LOGIC DIAGRAM

I0a

I1a

I0b

I1b

I0c

I1c

I0d

I1d

E

S

Za

Zb

Zc

Zd

Please note that this diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation delays.

MAXIMUM RATINGS*

Symbol

Parameter

Value

Unit

VCC

Vin

Vout

Iin

Iout

ICC

Tstg

DC Supply Voltage (Referenced to GND)

DC Input Voltage (Referenced to GND)

DC Output Voltage (Referenced to GND)

DC Input Current, per Pin

DC Output Sink/Source Current, per Pin

DC VCC or GND Current per Output Pin

Storage Temperature

–0.5 to +7.0

V

–0.5 to VCC +0.5

V

–0.5 to VCC +0.5

V

±20

mA

±50

mA

±50

mA

–65 to +150

°C

* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended

Operating Conditions.

FACT DATA

5-2

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