74ACT139
DESCRIPTION
The MC74AC139/74ACT139 is a high-speed dual 1-of-4 decoder/demultiplexer. The device has two independent decoders, each of which accepts two binary weighted inputs (A0- A1) and provides four mutually exclusive active-LOW outputs (O 0- O3). Each decoder has an active-LOW enable (E). When E is HIGH all outputs are forced HIGH. The enable can be used as the data input for a 4-output demultiplexer application. Each half of the MC74AC139/74ACT139 generates all four minterms of two variables. These four minterms are useful in some applications, replacing multiple gate functions as shown in Figure a, and thereby reducing the number of packages required in a logic network.
E A0 A1 E A0 A1 E A0 A1 E A0 A1 O3 O0 E A0 A1 E A0 A1 E O2 A0 A1 E A0 A1 O3 O2 O0
O1
O1
Figure a: Gate Functions (each half) 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...
