The 74VHCT238A is an advanced high-speed CMOS 3-to-8 line decoder fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It features high speed, low power dissipation, compatibility with TTL outputs, and can be used for 5V to 3V interfaces.
The 74VHCT238A is an advanced high-speed CMOS 3-to-8 line decoder fabricated with sub-micron silicon gate and double-layer metal wiring CMOS technology. When enabled, three binary select inputs determine which of the eight outputs goes high, with enable inputs provided to ease cascade connections for memory systems.
The device features TTL threshold inputs allowing interface between 5V and 3V systems, along with power-down protection on all inputs and outputs. It offers symmetrical output impedance, balanced propagation delays, and 2KV ESD immunity on all pins. The document provides detailed electrical characteristics, timing diagrams, and mechanical data for SO-16 and TSSOP packages.
| Operating Voltage Range | 4.5V to 5.5V |
|---|---|
| High Level Input Voltage (VIH) | 2V (Min) |
| Low Level Input Voltage (VIL) | 0.8V (Max) |
| Propagation Delay Time (Typical) | 5.5 ns |
| Quiescent Supply Current (Max) | 4 µA |
| ESD Immunity | 2KV |
Yes, the device is compatible with TTL outputs as all inputs are equipped with TTL threshold.
The recommended operating temperature range is -55°C to +125°C.
Yes, power-down protection is provided on all inputs and outputs.