54ACT521

·I_CC reduced by 50%
·Compares two 8-bit words in 6.5 ns typ
· Expandable to any word length
· Outputs source/sink 24 mA
· ACT521 has TTL-compatible inputs
· Standard microcircuit Drawing (SMD)
54AC521: 5962-90985
54ACT521: 5962-89793

Supply Voltage (V_CC)...... −0.5V to +7.0V
DC Input Diode Current (I_IK)
V_I = −0.5V ................−20 mA
V_I = V_CC + 0.5V ......... ....+20 mA
DC Input Voltage (V_I) ....−0.5V to V_CC + 0.5V
DC Output Diode Current (I_OK)
V_O = −0.5V................ −20 mA
V_O = V_CC + 0.5V.......... ... +20 mA
DC Output Voltage (V_O) . ..−0.5V to V_CC + 0.5V
DC Output Source
or Sink Current (I_O) ............±50 mA
DC V_CC or Ground Current
per Output Pin (I_CC or IGND)... .... ±50 mA
Storage Temperature (T_STG) ..−65°C to +150°C
Junction Temperature (T_J)
CDIP..................... 175°C

Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT™ circuits outside databook specifications.

The 54ACT521 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 I_{A = B} also serves as an active LOW enable input.