74ACT521

MC74AC521 MC74ACT521 8ĆBit Identity Comparator The MC74AC521/74ACT521 is an expandable 8-bit comparator. It compares 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. Compares Two 8-Bit Words in 6.5 ns Typ Expandable to Any Word Length 20-Pin Package Outputs Source/Sink 24 mA ′ACT521 has TTL-Compatible Inputs N SUFFIX CASE 738-03 PLASTIC 8-BIT IDENTITY COMPARATOR VCC OA=B 20 19 B7 18 A7 17 B6 16 A6 15 B5 14 A5 13 B4 12 A4 11 1 IA=B 2 A0 3 B0 4 A1 5 B1 6 A2 7 B2 8 A3 9 B3 10 GND DW SUFFIX CASE 751D-04 PLASTIC PIN NAMES A0–A7 B0–B7 IA=B OA=B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output LOGIC SYMBOL TRUTH TABLE Inputs IA=B L L H H A, B A = B* A≠B A = B* A≠B Outputs OA=B L H H H B7 A7 B6 A6 B5 A5 B4 A4 B3 A3 B2 A2 B1 A1 B0 A0 IA=B OA=B H = HIGH Voltage Level L = LOW Voltage Level *A0=B0, A1=B1, A2=B2, etc. FACT DATA 5-1 MC74AC521 MC74ACT521 LOGIC DIAGRAM A0 B0 A1 B1 A2 B2 A3 B3 OA=B A4 B4 A5 B5 A6 B6 A7 B7 IA=B Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. MAXIMUM RATINGS* Symbol VCC Vin Vout Iin Iout ICC Tstg Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC VCC or GN...