MC74LCX138

MC74LCX138 Low-Voltage CMOS 3-to-8 Decoder/Demultiplexer With 5 V−Tolerant Inputs The MC74LCX138 is a high performance, 3−to−8 decoder/demultiplexer operating from a 2.3 to 3.6 V supply. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A VI specification of 5.5 V allows MC74LCX138 inputs to be safely driven from 5 V devices. The MC74LCX138 is suitable for memory address decoding and other TTL level bus−oriented applications. The MC74LCX138 high−speed 3−to−8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active−LOW outputs (O0−O7). The LCX138 features three Enable inputs, two active−LOW (E1, E2) and one active−HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW, and E3 is HIGH. This multiple enabled function allows easy parallel expansion of the device to a 1−of−32 (5 lines to 32 lines) decoder with just four LCX138 devices and one inverter (see Figure 1). The LCX138 can be used as an 8−output demultiplexer by using one of the active−LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active−HIGH or active−LOW state. Current drive capability is 24 mA at the outputs. Features  Designed for 2.3 V to 3.6 V VCC Operation  5 V Tolerant Inputs − Interface Capability With 5 ...