CD4585BF3A is a 4-bit magnitude comparator designed for use in computer and logic applications that require the comparison of two 4-bit words. This logic circuit determines whether one 4-bit word (Binary or BCD) is "less than", "equalto", or "greater than" a second 4-bit word.
The CD4585BF3A has eight comparing inputs (A3, B3, through A0, B0), three outputs (A<B,A = B,A>B) and three cascading inputs (A<B,A=B,A>B) that permit systems designers to expand the comparator function to 8, 12, 16.....4N bits. Whena single CD4585BF3A is used, the cascading inputs are connected as follows: (A<B) = low, (A=B) = high, (A>B) = high.
Cascading these units for comparison of more than 4 bits is accomplished as shown in Fig. 13.
The CD4585BF3A types are supplied in 16-lead hermetic dual-in-line ceramic packages (F3A suffix), 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).
Feature
- Expansion to 8, 12, 16.....4N bits by cascading units
- Medium-speed operation:
compares two 4-bit words in 180 ns (typ.) at 10 V - 100% tested for quiescent current at 20 V
- Standardized symmetrical output characteristics
- 5-V, 10-V, and 15-V parametric ratings
- Maximum input current of 1 μA at 18 V over full package temperature range; 100 nA at 18 V and 25°C
- Noise margin (full package temperature range) =
1 V at VDD = 5 V
2 V at VDD = 10 V
2.5 V at VDD = 15 V - Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
- Applications:
- Servo motor controls
- Process controllers
