HIT HD74HC258 Datasheet

HD74HC258

Quad. 2-to-1-line Data Selectors/Multiplexers

(with 3-state outputs)

Description

The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with
bus lines in a bus organized system. When the output control input line is taken high, the outputs of all four
multiplexers are sent into a high impedance state. When the output control line is low, the select input
chooses whether the A or B input is used.

Features

• High Speed Operation: tpd (Data to Y) = 11 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

Inputs Outputs
Output Control Select A B Y

HX X X Z
LL L X H
LL H X L
LHXLH
LH X H L

Notes H: high level

L: low level
X: irrelevant
Z: off (high-impedance) state of a 3-state output

HD74HC258

Pin Arrangement

16

15

14

V

CC

Output
cotrol

4A

Inputs

Select

1A

1B

1

2

3

1A

1B

S

G

4A

Inputs

Outputs

1Y

2A

4

5

1Y

2A

4B

4Y

13

12

4B

4Y

Output

Inputs

2B

6

2B

3A

11

3A

Inputs

Outputs

2Y

GND

7

2Y

3Y

3B

8

10

3B

9

3Y

Output

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P

CC

IN

OUT

OUT

GND

IK

OK

T

Storage temperature Tstg –65 to +150 °C

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

2

Logic Diagram

1A

1B

2A

2B

3A

3B

4A

HD74HC258

V

CC

1Y

V

CC

2Y

V

CC

3Y

V

CC

4Y

Select

Output
control

4B

3