Programming instructions

TTL
Multisim Component Reference Guide 6-46 ni.com
BCD-to-seven-segment decoder/driver truth table:
DECIMAL
OR
FUNCTION
INPUTS
BI/
RBO
OUTPUTS NOTE
LTRBIDCBA a bc d e f g
0 1 1 00001 11111101
1
1
1 1 X00011 0110000
2 1 X00101 1101101
3 1 X00111 1111001
4 1 X01001 0110011
5 1 X01011 1011011
6 1 X01101 1011111
7 1 X01111 1110000
8 1 X10001 1111111
9 1 X10011 1111011
10 1 X10101 0001101
11 1 X10111 0011001
12 1 X11001 0100011
13 1 X11011 1001011
14 1 X11101 0001111
15 1 X11111 0000000
BI X X XXXX0 00000002
RBI 1 0 00000 00000003
LT 0 X XXXX1 11111114
Notes:
1. 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.
2. When a low logic level is applied to the blanking input (BI), all segment outputs are
low regardless of any other input.
3. 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).
4. When the blanking input/ripple-blanking output (BI/RBO) is open or held high and
a low is applied to the lamp-test input, all segment outputs are high.
ComponentRef.book Page 46 Thursday, December 7, 2006 10:12 AM