74ALS258 데이터 시트보기 (PDF) - Philips Electronics

부품명

상세내역

일치하는 목록

74ALS258

Data selector/multiplexer

Philips Electronics 

Philips Semiconductors

Data selector/multiplexer

Product specification

74ALS257/74ALS258

74ALS257 Quad 2-input data selector, non-inverting (3-State)

74ALS258 Quad 2-input data selector, inverting (3-State)

DESCRIPTION

The 74ALS257 is a quad 2-input multiplexer which selects 4 bits of

data from one of two sources under the control of a common select

input (S). The output enable input (OE) is active when Low. When

OE is High, all of the outputs (Yn) are forced to a High impedance

state (3-State) regardless of all other input conditions.

Moving data from two registers to a common output bus is a typical

use of the 74ALS257. The state of the select input determines the

particular register from which data comes.

The device is the logic implementation of 4-pole, 2-position switch

where the position of the switch is determined by the logic levels

supplied to the select input. The 74ALS258 is similar but has

inverting outputs (Yn).

TYPE

TYPICAL

PROPAGATION DELAY

74ALS257

74ALS258

7.0ns

7.0ns

TYPICAL

SUPPLY CURRENT

(TOTAL)

7mA

7mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

16-pin plastic DIP

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

74ALS257N, 74ALS258

16-pin plastic SO

74ALS257D, 74ALS258D

16-pin plastic SSOP

Type II

74ALS257DB, 74ALS258DB

DRAWING

NUMBER

SOT38-4

SOT109-1

SOT338-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74ALS (U.L.)

HIGH/LOW

Ina, Inb, Inc, Ind

Data inputs

1.0/1.0

S

Select input

1.0/1.0

OE

Enable input

1.0/1.0

Ya – Yd, Ya – Yd

Data outputs

20/240

NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.

LOAD VALUE

HIGH/LOW

20µA/0.1mA

20µA/0.1mA

20µA/0.1mA

0.4mA/24mA

PIN CONFIGURATION – 74ALS257

PIN CONFIGURATION – 74ALS258

S1

I0a 2

I1a 3

Ya 4

I0b 5

I1b 6

Yb 7

GND 8

16 VCC

15 OE

14 I0d

13 I1d

12 Yd

11 I0c

10 I1c

9 Yc

SF00673

S1

I0a 2

I1a 3

Ya 4

I0b 5

I1b 6

Yb 7

GND 8

16 VCC

15 OE

14 I0d

13 I1d

12 Yd

11 I0c

10 I1c

9 Yc

SC00079

1991 Feb 08

2

853–1130 01670

Share Link: