54ACT521 Datasheet | National Semiconductor

Description The AC/ACT521 is an expandable 8-bit parator. It pares two words of up to eight 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. Features n n n n n n ICC reduced by 50% pares two 8-bit words in 6.5 ns typ Expandable to any word length Outputs source/sink 24 m A ACT521 has TTL-patible inputs Standard microcircuit Drawing (SMD) 54AC521: 5962-90985 54ACT521: 5962-89793 Logic Symbols Connection Diagram Pin Assignment for DIP and CERPACK DS100291-1 IEEE/IEC DS100291-2 Pin Assignment for LCC DS100291-4 DS100291-3 Pin Descriptions Pin Names A0- A7 B0- B7 TA = B OA = B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output Description FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100291 .national. Truth Table Inputs IA = B L L H H H = HIGH Voltage Level L = LOW Voltage Level Note 1: A0 = B0, A1 = B1, A2 = B2, etc. Outputs A, B OA = B L H H H A = B (Note 1) A≠B A = B (Note 1) A≠B Logic Diagram DS100291-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. .national. Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = - 0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = - 0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP - 0.5V to +7.0V - 20 m A +20 m A - 0.5V to VCC + 0.5V - 20 m A +20 m A - 0.5V to VCC + 0.5V Remended Operating Conditions Supply Voltage (VCC) AC ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA)...