CD74AC138/CD74AC238 are 3-to-8-line decoders/demultiplexers that utilize the Harris Advanced CMOS Logic technology. Both circuits have 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 AC/ACT138 will go LOW or which on of the normally LOW outputs of the AC/ACT238 will go HIGH.
The document describes the CD74AC138, CD74ACT138, CD74AC238, and CD74ACT238 as 3-to-8-line decoders/demultiplexers utilizing Harris Advanced CMOS Logic technology. These devices feature buffered inputs, SCR-latchup-resistant design, and balanced propagation delays suitable for AC types (1.5V to 5.5V) and ACT types (4.5V to 5.5V).
| Supply Voltage Range (ACT Types) | 4.5V to 5.5V |
|---|---|
| Operating Temperature Range | -55°C to 125°C |
| Typical Propagation Delay (AC Types) | 5ns at V CC = 5V |
| ESD Protection Rating | 2kV |
The typical propagation delay is 5ns when V CC = 5V and TA = 25°C.
Yes, they can drive 50 Ω Transmission Lines.