CD4028BMS Datasheet, PDF (8/10 Pages) Intersil Corporation – CMOS BCD-To-Decimal Decoder

CD4028BMS
Typical Performance Characteristics (Continued)
AMBIENT TEMPERATURE (T_A) = +25^oC
200
SUPPLY VOLTAGE (VDD) = 5V
150
100
10V
15V
50
0
0
20
40
60
80
100
LOAD CAPACITANCE (CL) (pF)
FIGURE 7. TYPICAL TRANSITION TIME AS A FUNCTION OF LOAD CAPACITANCE
Typical Applications
The circuit shown in Figure 8 converts any 4-bit code to a
decimal or hexadecimal code. Table 2 shows a number of
codes and the decimal or hexadecimal number in these
codes which must be applied to the input terminals of the
CD4028BMS to select a particular output. For example: in
order to get a high on output number 8 the input must be
either an 8 expressed in 4-bit Binary code, a 15 expressed in
4-Bit Gray code, or a 5 expressed in Excess-3 code.
INPUTS
1/6 CD4069B
A
B
C
D
CD4028BMS
0123456789
ABC
D
CD4028BMS
0123456789
01234567
01234567
16 OUTPUTS
FIGURE 8. CODE CONVERSION CIRCUIT
INPUTS
TABLE 2. CODE CONVERSION CHART
INPUT CODES
HEXA-
DECIMAL
DECIMAL
OUTPUT NUMBER
DCBA
0000 0 0
0001 1 1
0010 2 3
0011 3 2 0
0100 4 7 1
0101 5 6 2
0110 6 4 3
0111 7 5 4
1 0 0 0 8 15 5
1 0 0 1 9 14 6
1 0 1 0 10 12 7
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
001000000000000000
110100000000000000
0 220010000000000000
33
0001000000000000
44
0000100000000000
30000010000000000
1
40000001000000000
2
0000000100000000
0000000010000000
50000000001000000
9
60000000000100000
7-795