HD74LS251 データシートの表示（PDF） - Renesas Electronics

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HD74LS251

1 of 8 Data Selector / Multiplexer (with strobe and three-state outputs)

Renesas Electronics 

HD74LS251

1 of 8 Data Selector / Multiplexer

(with strobe and three-state outputs)

REJ03D0467–0300

Rev.3.00

Jul.15.2005

This data selector / multiplexer contains full on-chip binary decoding to select one-of-eight data sources and features a

strobe-controlled 3-state output.

The strobe must be at a low logic level to enable this device. The 3-state outputs permit a number of outputs to be

connected to a common bus.

When the strobe input is high, both outputs are in a high-impedance state in which both the upper and lower transistors

of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low,

the outputs are activated and operate as standard TTL totem-pole outputs.

To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output

control circuitry is designed so that the average output disable time is shorter than the average output enable time.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

HD74LS251P

DILP-16 pin

PRDP0016AE-B

P

(DP-16FV)

HD74LS251FPEL SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

Note: Please consult the sales office for the above package availability.

Taping Abbreviation

(Quantity)

—

EL (2,000 pcs/reel)

Pin Arrangement

31

22

Data Inputs

13

04

Y5

Outputs

W6

Strobe 7

GND 8

D3

D2

D4

D1

D5

D0

D6

Y

D7

W

A

S

B

C

16 VCC

15 4

14 5

13 6

Data Inputs

12 7

11 A

10 B Data Select

9C

(Top view)

Rev.3.00, Jul.15.2005, page 1 of 5

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