MM74C48N データシートの表示（PDF） - Fairchild Semiconductor

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MM74C48N

BCD-to-7 Segment Decoder

Fairchild Semiconductor 

Truth Table

Decimal

Inputs

Outputs

or

BI/RBO

Note

Function LT RBI D C B A (Note 1) a b c d e f g

0

HHL L L L

H

H H H H H H L (Note 2)

1

HXL L LH

H

L H H L L L L (Note 2)

2

HXL LHL

H

HH L HH L H

3

HX L LHH

H

HHHH L LH

4

HXLHL L

H

LHH L LHH

5

HX LH L H

H

H L HH L HH

6

HX LHHL

H

L LHHHHH

7

HX LHHH

H

HHH L L L L

8

HXHL L L

H

HHHHHHH

9

HXHL LH

H

HHH L LHH

10

HXHLHL

H

L L LHHLH

11

HXH L HH

H

L LHHL LH

12

HXHH L L

H

LHL L LHH

13

HXHH LH

H

HL LHLHH

14

HXHHH L

H

L L LHHHH

15

HXHHHH

H

LLLLLLL

BI

XXXXXX

L

L L L L L L L (Note 3)

RBI

HL L L L L

L

L L L L L L L (Note 4)

LT

L XXXXX

H

H H H H H H H (Note 5)

H = HIGH Level

L = LOW Level

X = Irrelevant

Note 1: One BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).

Note 2: The blanking input (BI) must be open when output functions 0–15 are desired. The ripple-blanking input (RBI) must be HIGH, if blanking of a decimal

zero is not desired.

Note 3: When a LOW logic level is applied directly to the blanking input (BI), all segment outputs are LOW regardless of the level of any other input.

Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a LOW level with the lamp-test input HIGH, all segment outputs go LOW and the

ripple-blanking output (RBO) goes to a LOW level (response condition).

Note 5: When the blanking input/ripple-blanking output (BI/RBO) is open and a LOW is applied to the lamp-test input, all segment outputs are HIGH.

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