CD74HC138-Q1是TI公司的一款解码器/编码器/多路复用器产品，CD74HC138-Q1是汽车类高速 CMOS 逻辑 3 至 8 线路解码器多路解复用器（反向和非反向），本页介绍了CD74HC138-Q1的产品说明、应用、特性等，并给出了与CD74HC138-Q1相关的TI元器件型号供参考。
CD74HC138-Q1 - 汽车类高速 CMOS 逻辑 3 至 8 线路解码器多路解复用器（反向和非反向） - 解码器/编码器/多路复用器 - 特殊逻辑 - TI公司（Texas Instruments，德州仪器）
The CD74HC138 is a high-speed silicon-gate CMOS decoder well suited to memory address decoding or data routing applications. This circuit features low power consumption usually associated with CMOS circuitry, yet has speeds comparable to low-power Schottky TTL logic. The circuit has three binary select inputs (A0, A1, and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs of the HC138 will go low.
Two active-low and one active-high enables (E1, E2, and E3) are provided to ease the cascading of decoders. The decoder’s eight outputs can drive ten low-power Schottky TTL equivalent loads.
- Qualified for Automotive Applications
- Select One of Eight Data Outputs Active Low
- I/O Port or Memory Selector
- Three Enable Inputs to Simplify Cascading
- Typical Propagation Delay of 13 ns at VCC = 5 V, CL = 15 pF, TA = 25°C
- Fanout (Over Temperature Range)
- Standard Outputs . . . 10 LSTTL Loads
- Bus Driver Outputs . . . 15 LSTTL Loads
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- 2-V to 6-V VCC Operation
- High Noise Immunity; NIL or NIH = 30% of VCC, VCC = 5 V
