SN74HCT139数据手册集成电路（IC）的信号开关多路复用器解码器规格书PDF

描述 Description

The ’HCT139 devices are 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 introduced by the decoders is negligible.

The ’HCT139 devices comprise two individual 2-line to 4-line decoders in a single package. The active-low enable (G)\\ input 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.

特性 Features

• Operating Voltage Range of 4.5 V to 5.5 V
• Outputs Can Drive Up To 10 LSTTL Loads
• Low Power Consumption, 80-µA Max ICC
• Typical tpd = 10 ns
• ±4-mA Output Drive at 5 V
• Low Input Current of 1 µA Max
• Inputs Are TTL-Voltage Compatible
• Designed Specifically for High-Speed Memory Decoders and Data-Transmission Systems
• Incorporate Two Enable Inputs to Simplify Cascading and/or Data Reception