CD4585B 4-Bit Magnitude Comparators |

CD4585B (ACTIVE) 4-Bit Magnitude Comparators

4-Bit Magnitude Comparators - CD4585B

Other devices and data sheet

Other device variants can also be found in the  CD4585B product page

This data sheet applies to both  CD4585B and  CD4585B-MIL


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 (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. When a single CD4585B 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 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).


  • 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


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Bits (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) Operating temperature range (C) Package Group
CD4585B Order now CD4000     3     18     4     10     8     0.3     250     4/-4       -55 to 125     PDIP | 16
SO | 16
TSSOP | 16    
CD4063B Samples not available CD4000     3     18     4     10     8     0.3     500     4     -4     -55 to 125     PDIP | 16
SOIC | 16
SO | 16