Programming instructions

CMOS
Multisim Component Reference Guide 7-46 ni.com
7-segment latch/decoder/driver truth table:
7.2.87 4544 (BCD-to-seven segment latch/dec)
The 4544 BCD (Binary-Coded Decimal) -to-seven segment latch/decoder/driver is designed
for use with liquid crystal readouts. It is constructed with complementary MOS (CMOS)
enhancement mode devices. The circuit provides the functions of a 4-bit storage latch and an
8421 BCD-to-seven segment decoder and driver.
INPUTS OUTPUTS
LD BI PH *DDDCDBDAOa ObOcOdOe Of Og DISPLAY
X1 0 XXXX0 0 0 0000BLANK
10 0 00001111110 0
10 0 00010110000 1
10 0 00101101101 2
10 0 00111111001 3
10 0 01000110011 4
10 0 01011011011 5
10 0 01101011111 6
10 0 01111110000 7
10 0 10001111111 8
10 0 10011111011 9
10 0 10100000000 BLANK
10 0 10110000000 BLANK
10 0 11000000000 BLANK
10 0 11010000000 BLANK
10 0 11100000000 BLANK
10 0 11110000000 BLANK
00 0 XXXX **
as above 1 as above inverse as above as above
1 = HIGH state (the more positive voltage)
0 = LOW state (the less positive voltage)
X = state is immaterial
* For liquid crystal displays, apply a square-wave to PH.
For common cathode LED displays, select PH = LOW.
For common anode LED displays, select PH = HIGH.
** Depends upon the BCD-code previously applied when LD = HIGH
ComponentRef.book Page 46 Thursday, December 7, 2006 10:12 AM