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74AC139 データシート

部品番号74AC139 TI
Texas Instruments TI
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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
±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


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