(China (Mainland))
Product Summary
The SN54LS85J is a 4-bit magnitude comparator, performs 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. The SN54LS85J is 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 SN54LS85J is implemented with only a two~gate-leve delay to reduce overall comparison times for long words.
Parametrics
SN54LS85J absolute maximum ratings: (1)Supply voltage, VCC: 7V; (2)Input voltage: 7V; (3)Interemitter voltage: 5.5V; (4)Operating free-air temperature range: -55℃ to +125℃; (5)Storage temperature range: -65℃ to +150℃.
Features
SN54LS85J features: (1)High-level input voltage, VIH: 2V; (2)Low-level input voltage, VIL: 0.8V; (3)Input clamp voltage, VIK: -1.5V; (4)High-level output voltage, VOH: 2.4 to 3.4V; (5)Low-level output voltage, VOL: 0.2 to 0.4V; (6)Input current at maximum input voltage, II: 1mA; (7)High-level input current, A < B, A > B inputs, IIH: 40μA; all other inputs, IIH: 120μA; (8)Low-level input current, A < 8, A > B inputs, IIL: -1.6mA; all other inputs, IIL:-4.8mA; (9)Short-circuit output current, IOS: -20 to -55mA; (10)Supply current, ICC: 55 to 88mA.
Diagrams
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