54ACT399

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
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 VCC + 0.5V
DC Output Source or
Sink Current (I_O) .....................................±50 mA
DC V_CC or Ground Current
per Output Pin (I_CC or I_GND ) ..................±50 mA
Storage Temperature (T_STG) .....−65°C to +150°C
Junction Temperature (T_J)
CDIP ......................................................+175°C

Note : 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 54ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flop on the rising edge of the clock.

The 54ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flop on the rising edge of the clock.