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Datasheet 54LS49 PDF ( 特性, スペック, ピン接続図 )

部品番号 54LS49
部品説明 BCD to 7-Segment Decoder
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 
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54LS49 Datasheet, 54LS49 PDF,ピン配置, 機能
54LS49 BCD to 7-Segment Decoder
General Description
The 54LS49 translates four lines of BCD (8421) input data
into the 7-segment numeral code as shown in the Function
Table It has open-collector outputs and is logically the 14-
pin verson of the ’48 without the lamp test and ripple blank-
ing features Also see the ’LS249 data sheet
Connection Diagram
Dual-In-Line Package
Logic Symbol
June 1989
TL F 10204 – 1
Order Number 54LS49DMQB or 54LS49FMQB
See NS Package Number J14A or W14B
VCC e Pin 14
GND e Pin 7
Pin Names
A0 – A3
BI
a–g
Description
BCD Inputs
Blanking Input (Active LOW)
Segment Outputs (Active HIGH)
Numerical Designations Resultant Displays
TL F 10204 – 2
TL F 10204 – 3
C1995 National Semiconductor Corporation TL F 10204
RRD-B30M105 Printed in U S A

1 Page



54LS49 pdf, ピン配列
Function Table
Decimal
Inputs
Outputs
or
Function A3 A2 A1 A0 BI a b c d e f g Note
0
L L L L H HHHHHHL
1
1 L L L H H LHHL L L L
2 L L H L H HHLHHLH
3 L L H H H HHHHL LH
4 L H L L H LHHL LHH
5 L H L H H HLHHLHH
6 L H H L H L LHHHHH
7 L H H H H HHHL L L L
8 H L L L H HHHHHHH
9 H L L H H HHHL LHH
10 H L H L H L L L H H L H
11 H L H H H L L H H L L H
12 H H L L H L H L L L H H
13 H H L H H H L L H L H H
14 H H H L H L L L H H H H
15 H H H H H L L L L L L L
BI
X X X X L LLLLLLL
2
Note 1 The blanking input must be open or held at a HIGH level when output functions 0 through 15 are desired
Note 2 When a LOW level is applied to the blanking input all segment outputs go to a LOW level regardless of the state of any other input condition X e Input
may be HIGH or LOW
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Diagram
TL F 10204 – 4
3


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