Fairchild 74AC138 1-of-8 Decoder/Demultiplexer SOIC16 SMD
Fairchild 74AC138 1-of-8 Decoder/Demultiplexer SOIC16 SMD
Fairchild 74AC138 1-of-8 Decoder/Demultiplexer SOIC16 SMD
Manufactured by Fairchild - 74AC138SC - SOIC-16 SMD Package
DESCRIPTION
The AC/ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive activeLOW outputs (O0–O7). The AC/ACT138 features three Enable inputs, two active-LOW (E1, E2) and one activeHIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four AC/ACT138 devices and one inverter (see Figure 1). The AC/ACT138 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.
SPECIFICATIONS
Supply Voltage (VCC) - AC 2.0V to 6.0V
Input Voltage (VI) 0V to VCC
Output Voltage (VO) 0V to VCC
Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t)
AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V - 125 mV/ns