Programming instructions

4000 Series ICs
 National Instruments Corporation 7-47 Multisim Component Reference Guide
7-segment latch/decoder/driver truth table:
7.2.88 4555 (Dual 1-of-4 Dec/DEMUX)
INPUTS OUTPUTS
RBILDB1Ph *DCBARBOa bc d e f gDISPLAY
XX1 0 XXXX 0000000BLANK
110 0 000010000000BLANK
010 0 000001111110 0
X10 0 00010011 0000 1
X10 0 001001101101 2
X10 0 001101111001 3
X10 0 010000110011 4
X10 0 010101011011 5
X10 0 011001011111 6
X10 0 011101110000 7
X10 0 100001111111 8
X10 0 100101111011 9
X10 0 101000000000BLANK
X10 0 101100000000BLANK
X10 0 110000000000BLANK
X10 0 110100000000BLANK
X10 0 111000000000BLANK
X10 0 111100000000BLANK
X0 0 0 XXXX ** **
† † † † † † Inverse of Output
Combinations Above
Display as
above
X Don’t care
† Above combinations
*
**
RBO=RBI • (
ABCD)
The 4555 device is a dual 1-of-4 decoder/demultiplexer. Each has two address inputs (A0
and A1), an active LOW enable input (E
) and four mutually exclusive outputs that are active
HIGH (O0 to O3).
ComponentRef.book Page 47 Thursday, December 7, 2006 10:12 AM