SN74LS138

LOW POWER SCHOTTKY

TheLSTTL/MSISN74LS138isahighspeed1-of-8Decoder/Demultiplexer.Thisdeviceisideallysuitedforhighspeedbipolarmemorychipselectaddressdecoding.Themultipleinputenablesallowparallelexpansiontoa1-of-24decoderusingjustthreeLS138devicesortoa1-of-32decoderusingfour

SN74LS138

3 線至 8 線解碼器/多路解復(fù)用器; ? Designed Specifically for High-Speed: \n? Memory Decoders\n? Data Transmission Systems\n \n? 3 Enable Inputs to Simplify Cascading and/or Data Reception\n? Schottky-Clamped for High Performance;

These Schottky-clamped TTL MSI circuits are designed to be used in high-performance memory decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the Schottky-clamped system decoder is negligible. The 'LS138, SN54S138, and SN74S138A decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications. All of these decoder/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and to simplify system design. The SN54LS138 and SN54S138 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LS138 and SN74S138A are characterized for operation from 0°C to 70°C. ?

SN74LS138

LOW POWER SCHOTTKY;

SN74LS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SN74LS138

3-LINE TO 8-LINE DECORDERS/DEMULTIPLEXERS

SN74LS138

1-of-8 Decoder/ Demultiplexer

SN74LS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SN74LS138

3-LINE TO 8-LINE DECODERS / DEMUL TIPLEXERS

SN74LS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SN74LS138D

1-of-8 Decoder/Demultiplexer;

The LSTTL/MSI SN74LS138 is a high speed 1-of-8 Decoder/Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LS138 devices or to a 1-of-32 decoder using four LS138s and one inverter. The LS138 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all ON Semiconductor TTL families.? Demultiplexing Capability\n? Multiple Input Enable for Easy Expansion\n? Typical Power Dissipation of 32 mW\n? Active Low Mutually Exclusive Outputs\n? Input Clamp Diodes Limit High Speed Termination Effects