CY74FCT138T中文资料8 选 1 解码器数据手册TI规格书

描述 Description

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 (O\\0\\x96O\\7). The \\x92FCT138T devices feature three enable inputs: two active low (E\\1, E\\2) and one active high (E3 ). All outputs are high unless E\\1 and E\\2 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.

特性 Features

• Function, Pinout, and Drive Compatible With FCT and F Logic
• Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
• Matched Rise and Fall Times
• Dual 1-of-8 Decoder With Enables
• 200-V Machine Model (A115-A)
• CY54FCT138T
• 12-mA Output Source Current
• 32-mA Output Source Current