PinoutSpecificationsSupply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 0.5 V to 7 VInput voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . .. . . . 0.5 V to 7 VVoltage range applied to any output in the high-impedance or power-off st...
SN54LV139A: PinoutSpecificationsSupply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 0.5 V to 7 VInput voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . ...
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Features: PinoutSpecificationsDescriptionThe SN54/74LS147 and SN54/74LS148 are Priority Encoders. ...
PinoutDescriptionThe LS155 and LS156 are Dual 1-of-4 Decoder/Demultiplexers with common Address in...



The 'LV139A devices are dual 2-line to 4-line decoders/demultiplexers designed for 2-V to 5.5-V VCC operation.
LV139A is designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay time of these decoders and the enable time of the memory usually are less than the typical access time of the memory. This means that the effective system delay LV139A introduced by the decoders is negligible.
The 'LV139A devices comprise two individual 2-line to 4-line decoders in a single package. The active-low enable (G ) input of LV139A can be used as a data line in demultiplexing applications. These decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit.
LV139A is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.