CD74AC139E

TEXAS INSTRUMENTS  CD74AC139E  逻辑芯片, 译码器/数据选择器, 双路2-4, 16DIP

**description**

The ’AC139 devices are dual 2-line to 4-line decoders/demultiplexers designed for 1.5-V to 5.5-V VCC operation. These devices 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 used with high-speed memories utilizing a fast enable circuit, the delay times 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.

**AC Types Feature 1.5-V to 5.5-V Operation ****and Balanced Noise Immunity at 30% of the ****Supply Voltage**

**Buffered Inputs**

**Incorporate Two Enable Inputs to Simplify ****Cascading and/or Data Reception**

**Speed of Bipolar F, AS, and S, With ****Significantly Reduced Power Consumption**

**Balanced Propagation Delays**

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*24-mA Output Drive Current ****– Fanout to 15 F Devices**

**SCR-Latchup-Resistant CMOS Process and ****Circuit Design**

**Exceeds 2-kV ESD Protection Per ****MIL-STD-883, Method 3015**