Datasheet > SN54/74LS249

SN54/74LS249

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		驱动器
页数	文件大小	规格书
8页	283K
描述
BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS

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SN54/74LS249 数据手册

SN54/74LS247

SN54/74LS248

SN54/74LS249

BCD-TO-SEVEN-SEGMENT

DECODERS/DRIVERS

The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment

Decoder/Drivers.

The LS247 and LS248 are functionally and electrically identical to the LS47

and LS48 with the same pinout configuration. The LS249 is a 16-pin version

of the 14-pin LS49 and includes full functional capability for lamp test and

ripple blanking which was not available in the LS49.

BCD-TO-SEVEN-SEGMENT

DECODERS/DRIVERS

LOW POWER SCHOTTKY

Thecomposition of all characters, except the 6 and 9 are identical between

the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose

the

and

without tails, the LS247 thru 249 compose the and with

the tails. The LS247 has active-low outputs for direct drive of indicators. The

LS248 and 249 have active-high outputs for driving lamp buffers.

J SUFFIX

CERAMIC

All types feature a lamp test input and have full ripple-blanking input/output

controls. On all types an automatic leading and/or trailing-edge zero-blanking

control (RBI and RBO) is incorporated and an overriding blanking input (BI)

is contained which may be used to control the lamp intensity by pulsing or to

inhibit the output’s lamp test may be performed at any time when the BI/RBO

node is at high level. Segment identification and resultant displays are shown

below. Display pattern for BCD input counts above 9 are unique symbols to

authenticate input conditions.

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

LS247

• Open-Collector Outputs Drive Indicators Directly

• Lamp-Test Provision

• Leading/Trailing Zero Suppression

D SUFFIX

SOIC

CASE 751B-03

LS248

• Internal Pull-Ups Eliminate Need for External Resistors

• Lamp-Test Provision

• Leading/Trailing Zero Suppression

ORDERING INFORMATION

LS249

SN54LSXXXJ

Ceramic

• Open-Collector Outputs

• Lamp-Test Provision

• Leading/Trailing Zero Suppression

SN74LSXXXN Plastic

SN74LSXXXDW SOIC

NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS

SEGMENT

IDENTIFICATION

FAST AND LS TTL DATA

5-402

12 3 4 5 6 7 8

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