SN74LS85 (ACTIVE)

4-bit magnitude comparators

4-bit magnitude comparators - SN74LS85
Datasheet
 

Description

These four-bit magnitude comparators perform comparison of straight binary and straight BCD (8-4-2-1) codes. Three fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. These devices are fully expandable to any number of bits without external gates. Words of greater length may be compared by connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits are connected to the corresponding A > B, A < B, and A = B inputs of the next stage handling more-significant bits. The stage handling the least-significant bits must have a high-level voltage applied to the A = B input. The cascading paths of the '85, 'LS85, and 'S85 are implemented with only a two-gate-level delay to reduce overall comparison times for long words. An alternate method of cascading which further reduces the comparison time is shown in the typical application data.

Features

 

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Parametrics Compare all products in Digital Comparator

 
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)
Output Drive (IOL/IOH) (Max) (mA)
Rating
Operating Temperature Range (C)
Pin/Package
SN74LS85 SN54LS682 SN54LS85 SN74LS682 SN74LS684 SN74LS688
LS    LS    LS    LS    LS    LS   
4.75    4.85    4.75    4.85    4.85    4.85   
5.25    5.25    5.25    5.25    5.25    5.25   
4    8    4    8    8    8   
5    5    5    5    5    5   
35    35    35    35    35    35   
88    70    88    70    65    68   
35    30    35    30    30    23   
16/-0.4    24/-0.4    16/-0.4    24/-0.4    24/-0.4    24/-0.4   
Catalog    Military    Military    Catalog    Catalog    Catalog   
0 to 70    -55 to 125    -55 to 125    0 to 70    0 to 70    0 to 70   
16PDIP
16SO
16SOIC   
20CDIP
20CFP   
16CDIP
16CFP
20LCCC   
20PDIP
20SO
20SOIC   
20PDIP
20SO
20SOIC   
20PDIP
20SO
20SOIC   

Other qualified versions of SN74LS85

Version Part Number Definition
Military SN54LS85 QML certified for Military and Defense Applications