MC74F258JS [MOTOROLA]

Multiplexer, 4-Func, 2 Line Input, TTL, CDIP16;


型号：	MC74F258JS
厂家：	MOTOROLA
描述：	Multiplexer, 4-Func, 2 Line Input, TTL, CDIP16 复用器输出元件输入元件
文件：	总3页 (文件大小：68K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MC74F258A

QUAD 2-INPUT MULTIPLEXER

WITH 3-STATE OUTPUTS

The MC74F258A is a quad 2-input multiplexer with 3-state outputs. Four

bits of data from two sources can be selected using a common Data Select

input. Thefouroutputspresenttheselecteddatainthecomplement(inverted)

form. The outputs may be switched to a high impedance state with a HIGH

on the common Output Enable (OE) input, allowing the outputs to interface di-

rectly with bus-oriented systems.

QUAD 2-INPUT MULTIPLEXER

WITH 3-STATE OUTPUTS

FAST SCHOTTKY TTL

• Multiplexer Expansion by Tying Outputs Together

• Inverting 3-State Outputs

• AC Enhanced Version of the F258

CONNECTION DIAGRAM (TOP VIEW)

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

GND

D SUFFIX

LOGIC DIAGRAM

SOIC

CASE 751B-03

ORDERING INFORMATION

MC54FXXXAJ Ceramic

MC74FXXXAN Plastic

MC74FXXXAD SOIC

LOGIC SYMBOL

= PIN 16

GND = PIN 8

FAST AND LS TTL DATA

4-130

MC74F258A

FUNCTION TABLE

Output

Enable

Select

Input

Data

Inputs

Output

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

Z = High Impedance

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

4.5

Typ

5.0

Max

5.5

Unit

Supply Voltage

Operating Ambient Temperature Range

Output Current — High

°C

–3.0

Output Current — Low

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Input HIGH Voltage

Min

Typ

Max

Unit

Test Conditions

2.0

Guaranteed Input HIGH Voltage

Guaranteed Input LOW Voltage

Input LOW Voltage

0.8

Input Clamp Diode Voltage

Output HIGH Voltage

–1.2

= –18 mA

= MIN

2.7

2.4

3.3

= –3.0 mA

= 4.75 V

= MIN

Output LOW Voltage

0.35

0.5

= 24 mA

= MIN

OZH

OZL

Output OFF Current — HIGH

Output OFF Current — LOW

Input HIGH Current

µA

= 2.7 V

= 0.5 V

= MAX

OUT

–50

= 2.7 V

100

–0.6

–150

9.5

= 7.0 V

Input LOW Current

= 0.5 V

= MAX

Output Short Circuit Current (Note 2)

–60

= 0 V

OUT

CCH

6.2

15.1

11.3

S, I = 4.5 V

OE, I = GND

Power Supply Current

= 4.5 V

= MAX

CCL

CCZ

OE, I , S = GND

S, I = GND

OE, I = 4.5 V

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.

2. Not more than one output should be shorted at a time, nor for more than 1 second.

FAST AND LS TTL DATA

4-131

MC74F258A

AC CHARACTERISTICS

74F

= +25°C

74F

= 0°C to 70°C

= +5.0 V

= 50 pF

Max

5.3

= 5.0 V ± 10%

Min

2.5

1.0

3.0

2.5

2.0

2.5

2.0

1.5

C = 50 pF

Symbol

Parameter

Min

2.0

1.0

3.0

2.5

2.0

2.5

2.0

1.5

Max

Unit

Propagation Delay

to Z

6.0

5.0

8.5

8.0

7.0

8.0

7.0

PLH

PHL

PLH

PHL

PZH

4.0

Propagation Delay

S to Z

7.5

7.0

Output Enable Time

6.0

7.0

PZL

Output Disable Time

6.0

PHZ

6.0

PLZ

FUNCTIONAL DESCRIPTION

The F258A is a quad 2-input multiplexer with 3-state out-

puts. It selects four bits of data from two sources under control

of a common Select input (S). When the Select input is LOW,

Z = OE • (I • S + I • S)

1a 0a

Z = OE • (I • S + I • S)

1b 0b

Z = OE • (I • S + I • S)

1c 0c

the I inputs are selected and when Select is HIGH, the I

Z = OE • (I • S + I • S)

1d 0d

0x 1x

inputs are selected. The data on the selected inputs appears

at the outputs in inverted form. The F258A is the logic imple-

mentation of a 4-pole, 2-position switch where the position of

the switch is determined by the logic levels supplied to the Se-

lect input. The logic equations for the outputs are shown be-

low:

WhentheOutputEnableinput(OE)isHIGH,theoutputs are

forced to a high impedance OFF state. If the outputs of the

3-state devices are tied together, all but one device must be in

the high impedance state to avoid high currents that would ex-

ceed the maximum ratings. Designers should ensure the Out-

put Enable signals to 3-state devices whose outputs are tied

together are designed so there is no overlap.

FAST AND LS TTL DATA

4-132

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