SN74LS85 4-bit magnitude comparators | TI.com

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)
IOL (Max) (mA)
IOH (Max) (mA)
Operating Temperature Range (C)
Package Group
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     24/-0.4     16/-0.4     24     24     24    
-0.4         -0.4     -0.4     -0.4    
0 to 70     -55 to 125     -55 to 125     0 to 70     0 to 70     0 to 70    
PDIP | 16
SOIC | 16
SO | 16    
CDIP | 20
CFP | 20    
CDIP | 16
CFP | 16
LCCC | 20    
PDIP | 20
SOIC | 20
SO | 20    
PDIP | 20
SOIC | 20
SO | 20    
PDIP | 20
SOIC | 20
SO | 20