’47A Switching Characteristics

Symbol

Parameter

Conditions

Min

Max

Units

Propagation Delay Time

100

ns

Low to High Level Output

Propagation Delay Time

100

ns

High to Low Level Output

Function Table

46A 47A

Decimal or

Inputs

BIRBO

Outputs

Note

Function

LT

RBI

D

C

B

A

(Note 1)

abc

d

e

f

g

0

H

H

L

LLL

H

LLLLLL

H

1

H

X

L

L

L

H

H

HL

LH

H

H

H

2

H

X

L

LHL

H

L

L

HL

LHL

3

H

X

L

L

H

H

H

LLLL

H

H

L

4

H

X

L

HL

L

H

HL

LH

HL

L

5

H

X

L

HLH

H

LHL

L

HL

L

6

H

X

L

HH

L

H

HH

L

L

L

L

L

7

H

X

L

HHH

H

L

L

L

H

HHH

(2)

8

H

X

H

LLL

H

LLLLLLL

9

H

X

H

LL

H

H

LLL

H

H

L

L

10

H

X

HLHL

H

H

H

H

L

L

HL

11

H

X

HLH

H

H

H

HL

LH

HL

12

H

X

HH

L

L

H

H

L

H

HH

L

L

13

H

X

HH

L

H

H

L

HH

L

H

L

L

14

H

X

HHH

L

H

H

HH

L

L

L

L

15

H

X

HHHH

H

H

HHHHHH

BI

X

X

X

X

X

X

L

H

HHHHHH

(3)

RBI

H

L

L

L

L

L

L

H

HHHHHH

(4)

LT

L

X

X

X

X

X

H

L

LLLLLL

(5)

Note 1

BIRBO is a wire-AND logic serving as blanking input (BI) andor ripple-blanking output (RBO)

Note 2

The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired The ripple-blanking input (RBI) must

be open or 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 high 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 H and the ripple-

blanking output (RBO) goes to a low level (response condition)

Note 5

When the blanking inputripple-blanking output (BIRBO) is open or held high and a low is applied to the lamp-test input all segment outputs are L

4