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CY74FCT138CT,pdf(1-of-8 Decode

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  • 标      签: Decoders

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The x92FCT138T devices are 1-of-8 decoders. These devices accept three binary weighted inputs (A0, A1, A2) and, when enabled, provide eight mutually exclusive acTIve-low outputs (Ox96O7). The x92FCT138T devices feature three enable inputs: two acTIve low (E1, E2) and one acTIve high (E3 ). All outputs are high unless E1 and E2 are low and E3 is high. This mulTIple-enable function allows easy parallel expansion of the device to a 1-of-32 (five lines to 32 lines) decoder with just four x92FCT138T devices and one inverter. These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.
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