描述 Description

CD4585B 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\", \"equal to\", or \"greater than\" a second 4-bit word.

The CD4585B has eight comparing inputs (A3, B3, through A0, B0), three outputs (AB) and three cascading inputs (AB) that permit systems designers to expand the comparator function to 8, 12, 16.....4N bits. When a single CD4585B is used, the cascading inputs are connected as follows: (AB) = high.

Cascading these units for comparison of more than 4 bits is accomplished as shown in Fig. 13.

The CD4585B 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).

特性 Features

? 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