M74HC257 查看數據表（PDF） - STMicroelectronics

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M74HC257

HC258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING) HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

M54/M74HC257/258

INPUT AND OUTPUT EQUIVALENT CIRCUIT

CHIP CARRIER

HC257

HC258

NC = No Internal Connection

PIN DESCRIPTION (HC257)

PIN No

1

SYMBOL

SELECT

2, 5, 14, 11

3, 6, 13, 10

4, 7, 12, 9

1A to 4A

1B to 4B

1Y to 4Y

15

OE

8

GND

16

VCC

NAME AND FUNCTION

Common Data Select

Input

Data Input From Source A

Data Inputs from Source B

3 State Multiplexer

Outputs

3 State Output Enable

Inputs (Active LOW)

Ground (0V)

Positive Supply Voltage

PIN DESCRIPTION (HC258)

PIN No

1

SYMBOL

SELECT

2, 5, 14, 11

3, 6, 13, 10

4, 7, 12, 9

1A to 4A

1B to 4B

1Y to 4Y

15

OE

8

GND

16

VCC

NAME AND FUNCTION

Common Data Select

Input

Data Input From Source A

Data Inputs from Source B

3 State Multiplexer

Outputs

3 State Output Enable

Inputs (Active LOW)

Ground (0V)

Positive Supply Voltage

2/12

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