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12 mA 74 15 输出低电平电流IOL 54 12 mA 74 24 动态特性 (TA=25℃ ) 参 数 测 试 条 件 LS244 单位 最 大 tPLH输出由低到高传输延迟时间 Vcc =5V CL=45pF RL=667 Ω 18 ns tPHL输出由高 到低传输延迟时间 18 ns tPZH输出由高阻态到高允许时间 23 ns tPZL输出由高阻态到低允许时间 30 ns