The 74HC85 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC85 are 4-bit magnitude comparators that can be expanded to almost any length. They perform comparison of two 4-bit binary, BCD or other monotonic codes and present the three possible magnitude results at the outputs (QA>B, QA=B and QAB, IA=B and IAB = = LOW and IA=B = HIGH. For words greater than 4-bits, units can be cascaded by connecting outputs QAΒ and QA=B to the corresponding inputs of the significant comparator.
• Serial or parallel expansion without extra gating
• Magnitude comparison of any binary words
• Output capability: standard
• ICC category: MSI
|tPHL/ tPLH||Propagation Delay to QAB 15 15 ns IA=B to QA=B 11 15 ns||CL = 15 pF; VCC = 5 V||ns|
|An, Bn to QA>B , QAB||20||22||ns|
|An, Bn to QA=B||18||20||ns|
|IA<B,, IA=B, IA>B to QA<B, QA>B||15||15||ns|
|A=B to QA=B||11||15||ns|
|CPD||Power Dissipation Capacitance per package||notes 1 and 2||18||20||Pf|
* product image for illustration purposes only. actual product may vary.