54ACT1

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 to V_CC + 0.5V
DC Output Source
or Sink Current (I_O) ..........±50 mA
DC VCC or Ground Current
per Output Pin (I_CC or I_GND) ......±50 mA
Storage Temperature (T_STG) .−65C to +150
Junction Temperature (TJ)
CDIP ....................175

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 54ACT1 is fully synchronous 4-stage up/down counter. The 54ACT1 is a modulo-16 binary counter. It features a preset capability for programmable operation, carry lookahead for easy cascading and a U/D input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the LOW-to-HIGH transition of the Clock.