74F521

INTEGRATED CIRCUITS 74F521 8-bit identity comparator Product specification IC15 Data Handbook 1990 May 15 Philips Semiconductors Philips Semiconductors Product specification 8-bit identity comparator 74F521 FEATURES Compares two 8-bit words in 6.5ns typical Expandable to any word length DESCRIPTION The 74F521 is an expandable 8-bit comparator. It compares two words of up to 8 bits each and provides a Low output when the two words match bit for bit. The expansion input IA=B also serves as an active-Low enable input. TYPICAL PROPAGATION DELAY 7.0ns TYPICAL SUPPLY CURRENT (TOTAL) 24mA PIN CONFIGURATION IA=B 1 A0 B0 A1 B1 A2 B2 A3 B3 2 3 4 5 6 7 8 9 20 VCC 19 QA=B 18 B7 17 A7 16 B6 15 A6 14 B5 13 A5 12 B4 11 A4 TYPE 74F521 GND 10 SF00273 ORDERING INFORMATION DESCRIPTION 20-pin plastic DIP 20-pin plastic SOL COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F521N N74F521D PKG DWG # SOT146-1 SOT163-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS A0 – A7 B0 – B7 IA=B QA=B Word A inputs Word B inputs Expansion or Enable input (active Low) Identity output (active Low) DESCRIPTION 74F (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 1.0/1.0 50/33 LOAD VALUE HIGH/LOW 20µA/0.6mA 20µA/0.6mA 20µA/0.6mA 1.0mA/20mA NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state. LOGIC SYMBOL 1 IEC/IEEE SYMBOL 2 IA=B 4 6 8 11 13 15 17 QA=B 19 3 5 7 9 12 14 15 18 1 7 EN B 3 A=B 0 19 A COMP 0 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 VCC = Pin 20 GND =...