Programming instructions

TTL
Multisim Component Reference Guide 6-78 ni.com
BCD-to-seven-segment decoder:
INPUTS OUTPUTS
No. LT
RBI DCBA
BI/
RBO
abcdef g
011000011111110
11X000110110000
21X001011101101
31X001111111001
41X010010110011
51X010111011011
61X011010011110
71X011111110000
81X100011111111
91X100111110011
101X101010001101 INVA
LID
111X101110011001<
121X110010100011<
131X110111001011<
141X111010001111
151X111110000000
BIXXXXXX00000000
RBI10000000000000
LT0 XXXXX11111111
BI = active-low blanking input
RBI
= active-low ripple-blanking input
LT
= active-low lamp-test input
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 level.
3. To place the device in lamp-test mode, RBO must be high when LT is low. This
forces all lamps on.
ComponentRef.book Page 78 Thursday, December 7, 2006 10:12 AM