Numerical DesignationsResultant Displays

TLF10172 – 4

Truth Table

Decimal

Inputs

Outputs

Or

Function

LT

RBI

BIRBO

abc

d

e

f

g

0 (Note 1)

H

H

L

L

L

L

H

H

H

H

H

H

H

L

1 (Note 1)

H

X

L

L

L

H

H

L

H

H

LLLL

2

H

X

L

L

H

L

H

H

H

LH

HLH

3

H

X

L

L

H

H

H

H

H

H

HL

LH

4

H

X

L

H

L

L

H

LH

HL

LH

H

5

H

X

L

H

L

H

H

HLH

HLH

H

6

H

X

L

H

H

L

H

L

L

HHHHH

7

H

X

L

H

H

H

H

H

H

H

LLLL

8

H

X

H

L

L

L

H

HHHHHHH

9

H

X

H

L

L

H

H

HHH

L

L

HH

10

H

X

HLHL

H

L

L

L

H

H

L

H

11

H

X

H

L

H

H

H

LL

H

H

LL

H

12

H

X

H

H

L

L

H

LHL

L

L

H

H

13

H

X

H

H

L

H

H

H

L

L

HLH

H

14

H

X

H

H

H

L

H

L

L

L

HHHH

15

H

X

H

H

H

H

H

LLLLLLL

BI (Note 2)

X

X

X

X

X

X

L

L

L

L

LLLL

RBI (Note 3)

H

L

L

L

L

L

L

L

L

L

LLLL

LT (Note 4)

L

X

X

X

X

X

H

H

H

H

HHHH

Note 1

BIRBO is wired-AND logic serving as blanking input (BI) andor ripple-blanking output (RBO) The blanking out (BI) must be open or held at a HIGH level

may be HIGH or LOW

Note 2

When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state of any other input

condition

Note 3

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

Note 4

When the blanking inputripple-blanking output (BIRBO) is open or held at a HIGH level and a LOW level is applied to lamp test input all segment outputs

go to a HIGH level

Logic Symbol

TLF10172 – 2

3