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MC74LCX138-MC74LCX138DR2-MC74LCX138DTR2
Low-Voltage CMOS 3-to-8 Decoder/Demultiplexer
MC74LCX138
Low-Voltage CMOS 3-to-8
Decoder/Demultiplexer
With 5 V−Tolerant InputsThe 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 V TTL Logic LVTTL Compatible LVCMOS Compatible 24 mA Balanced Output Sink and Source Capability Near Zero Static Supply Current (10 �A) Substantially Reduces
System Power Requirements Latchup Performance Exceeds 500 mA ESD Performance: Human Body Model >2000 V
Machine Model >200 V Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details, please
